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todo.txt
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Seeing if I can commit.
In Runner.parseConcurrenConfig method
val enableSuiteSortingReporter = concurrentList.find(_.startsWith("-cS")).isDefined
can be:
val enableSuiteSortingReporter = concurrentList.exists(_.startsWith("-cS"))
Could probably use a for expression for the concurrentDispatch thing
Probably need to allow SSR in sbt?
Need to document sortSuites in ant task.
I need to carefully review SSR.
Testing ability to check in...
- sheesh looks like testng has some problem. Expected test count is wrong for one. Also, was firing a lame info provided report on configuration success.
and it is printing out to the standard output. Is there a way to block that?
- add the other features in the Runner doc that were added
- email George and ask whether there's a way to specify -j things via the Ant task
- reproduce 2.8 bug and put in trac (do I remember what this was?)
- finish writing tests for new core traits
- make 2nd pass at writing main docs of core traits
- seemed like wordspec was acting wierd when running with JUnit in IntelliJ, even though FunSuite looked fine. Investigate.
- mention the issue in Conductor with the Thread state problem.
Maven howto: http://jpz-log.info/archives/2009/09/29/scalatest-in-maven/
scalatest] writing xml file target/TEST-org.scalatest.mock.JMockCycleSpec.xml
[scalatest] Run completed in 42 seconds, 447 milliseconds.
[scalatest] Total number of tests run: 2154
[scalatest] Suites: completed 101, aborted 0
[scalatest] Tests: succeeded 2154, failed 0, ignored 2, pending 23
[scalatest] All tests passed.
[scalatest] Run starting. Expected test count is: 1
[scalatest] - should throw IAE if passed an empty set for testName in the apply method (22 milliseconds) [Thread-10]
[scalatest] Reporter completed abruptly with an exception after receiving event: RunCompleted(org.scalatest.events.Ordinal@705,Some(42),None,None,None,Thread-10,1253936258912).
[scalatest] java.lang.RuntimeException: unexpected event [TestStarting(org.scalatest.events.Ordinal@703,FilterSpec,Some(org.scalatest.FilterSpec),A Filter should throw IAE if passed an empty set for testName in the apply method,Some(MotionToSuppress),Some(<function>),None,Thread-10,1253936258890)]
[scalatest] at org.scalatest.tools.XmlReporter.unexpected$1(XmlReporter.scala:355)
[scalatest] at org.scalatest.tools.XmlReporter.collateEvents(XmlReporter.scala:367)
[scalatest] at org.scalatest.tools.XmlReporter.writeXmlFiles(XmlReporter.scala:66)
[scalatest] at org.scalatest.tools.XmlReporter.apply(XmlReporter.scala:56)
[scalatest] at org.scalatest.DispatchReporter$$anonfun$1$$anonfun$apply$1$$anonfun$apply$2.apply(DispatchReporter.scala:152)
[scalatest] at org.scalatest.DispatchReporter$$anonfun$1$$anonfun$apply$1$$anonfun$apply$2.apply(DispatchReporter.scala:151)
[scalatest] at scala.List.foreach(List.scala:834)
[scalatest] at org.scalatest.DispatchReporter$$anonfun$1$$anonfun$apply$1.apply(DispatchReporter.scala:151)
[scalatest] at org.scalatest.DispatchReporter$$anonfun$1$$anonfun$apply$1.apply(DispatchReporter.scala:101)
[scalatest] at scala.actors.Actor$class.receive(Actor.scala:438)
[scalatest] at scala.actors.Actor$$anon$1.receive(Actor.scala:93)
[scalatest] at scala.actors.Actor$.receive(Actor.scala:148)
[scalatest] at org.scalatest.DispatchReporter$$anonfun$1.apply(DispatchReporter.scala:101)
[scalatest] at org.scalatest.DispatchReporter$$anonfun$1.apply(DispatchReporter.scala:50)
[scalatest] at scala.actors.Actor$$anon$1.act(Actor.scala:94)
[scalatest] at scala.actors.Reaction.run(Reaction.scala:76)
[scalatest] at scala.actors.Actor$$anonfun$start$1.apply(Actor.scala:784)
[scalatest] at scala.actors.Actor$$anonfun$start$1.apply(Actor.scala:782)
[scalatest] at scala.actors.FJTaskScheduler2$$anon$1.run(FJTaskScheduler2.scala:165)
[scalatest] at scala.actors.FJTask$Wrap.run(Unknown Source)
[scalatest] at scala.actors.FJTaskRunner.scanWhileIdling(Unknown Source)
[scalatest] at scala.actors.FJTaskRunner.run(Unknown Source)
Make all function parameters named fun.
Literally following the Spec/Group example using only it() works fine
with Spec. However, using it() inside describe() with a Group
generates a scalac internal error: class
java.lang.reflect.InvocationTargetException.
The compilation error is not present after removing the group from the
nested it() statement. Here's the code to reproduce the issue:
Was from Scott Tran:
import collection.mutable.Stack
import org.scalatest.matchers.ShouldMatchers
import org.scalatest.{Group, Spec}
object Fast extends Group("Fast")
object Slow extends Group("Slow")
class StackSpec extends RefSpec with ShouldMatchers {
it ("should test something", Fast) {
}
it("should test something slow", Slow) {
}
describe("A Stack") {
it("should pop values in last-in-first-out order", Fast) {
val stack = new Stack[Int]
stack.push(1)
stack.push(2)
stack.pop() should equal (2)
stack.pop() should equal (1)
}
it("should be empty when created") {
val stack = new Stack[Int]
stack should be ('empty)
}
}
}
Future enhancements:
Potential performance enhancements.
Right now all runner threads need to compete to write to a single actor's inbox. I noticed a pretty big
wait time on that monitor. If that turns out to be the case, then seems better to let each thread write
events to its own queue, and have one reader thread that's reading those queues in round robin fashion. That
way each runner thread firing events only needs to compete with a single reader thread for access to the queue,
and the more runner threads that get going, the less often they'll need to compete with the reader thread. Probably
first try using a ConcurrentLinkedQueue for the queue.
Most of the time people don't use info, and most of the time people don't do multi-threaded tests. It is even less
often that people use info from inside threads created by multi-threaded tests. However, right now I have info
grabbing an Informer from an atomic, and that atomic is updated by run and runTest, updated at the beginning and
reset at the end. So each time I think there's a flush to main memory. This seems like it might be a big perfomance
cost to pay given how rarely people use info. So my idea is to use a thread containment approach instead. The model
is that one thread constructs each suite and either the same thread or another runs it, but only one thread should be running
a suite at any one time. Tests may start thread that can call info, but those threads should actually go away before
the test ends. That's the model. So what I can do instead of what I'm doing is leave the atomic bundle as it is, but when
run is called, it grabs the atomic bundle, makes a copy of it in private variables that aren't synchronized (so may not
be visible to other threads), then updates the bundle to indicate it is running the suite. It by the way checks first to
make sure some other thread hasn't marked that it is currently running the suite, and if it is it throws ye olde
ConcurrentModificationException. At the end of run in a finally, it resets that flag and flushes again, so the suite
is ready for another thread to run it if one does. (Usually when using ScalaTest these suite objects will only be run
once, but they can be run multiple times in the interpreter, etc., if someone wants to do that.) It also would record
a reference the thread object that is running (and this would be flushed to main memory). This will definitely be cleared in run's finally, do it can get garbage collected.
Then the rest of the time, run, runNestedSuites, runTests, and runTest will just use the instance variables
without synchronization. That way when people use ScalaTest like it is intended, which I expect will be the case 99.99% of the time,
running a suite of tests will only require one memory cache flush at the beginning of the run and one at the end. Given
memory is the new disk, this might help improve performance. Multi-threaded tests can call info, and they may see any of the
informers that were put there, but I think what I need to do is keep track of the thread that's running the thing, and compare
threads. If it isn't the running thread, then it doesn't include test info. So that's the trick is that any informer that gets
in there, which may get flushed one way or another, would know which thread is the running thread, and o
Actually, the info method would do a get on the atomic that has the running thread in it. So if you use info, you
do pay for that get. If the current thread is equal to the running thread, then it will use the informer stashed in
the instance variable without synchronization. Otherwise, it will use a generic knows-just-about-the-suite informer, which
won't include a test name. That way the only read from main memory is if you actually *use* info, and the cost is
once per usage of info. Right now, I'm paying the price of doing reads and writes for every single test.
Log4j has appenders. java.util.logging has handlers. I think the model would be you'd ask runner
to register a handler or an appender, and it could do that, then it would get a LogRecorder object
or something from that, and pass it to run. There would be an Option[LogRecorder] param in there.
A test would call testStarting on the LogRecorder, to let it know it is starting. I think testStarting
would return a ID object, which the runTest method would store in a local variable. If the test
succeeds, it would call testSucceeded on the LogRecorder, passing in the ID, so that the LogRecorder
could forget about that one. Then, if the test failed, though, it would call testFailed on the
LogRecorder object, passing in the ID, and LogRecorder would return a collection of log messages
that were received since the testStarting invocation that returned that ID. It would forget about
that ID also. The test would forward those log messages to the reporter via InfoProvided events.
Maybe the trait name should be LogRecorder, so I add a parameter to run, runTests, runTest, and runNestedSuites
of type Option[LogRecorder]. One of these could be passed into Conductor's constructor, maybe, from the withFixture
method. It is the same idea. It could be one that has a way to pass String messages into it. StringLogRecorder or
SimpleLogRecorder. Something like that. There could later be LogRecorders that work for Log4j and java.util.logging
stuff, and even stdout and stderr maybe. I would add a logRecorder method to TestFunction that returns
an Option[LogRecorder]. Nah, just leave it be. The idea is LogRecorder stuff is coming from the outside, not
inside a test. Inside a test what you want is a *logger*, and you could just use whatever logger is being
recorded. That would be the way to do it.
Make all the traits, like JUnitSuite, which override run in a way that doesn't use runNestedSuites, runTests, runTest,
runNoArgTestFunction, etc., override these and make them final and have them throw UnsupportedOperationException. This
will make it a compiler error to mix in say BeforeAndAfterEach, i.e., any trait that tries to modify behavior by
overriding these methods and calling super. versions of them. It will render a runtime error any invocation of
one of these methods when they really don't work. (Actually, could implement them to work correctly, things like
testNames, suiteName, tags, maybe these should always be implemented. I should decide this and say it as part of the
contract. But testNames may not be known, right?)
Show 5 lines of stack trace in print reporter.
Had the problem of a missing exception message in the GUI again:
[scalatest] Suite Completed - ErrorTestNGSuite
[scalatest] SUITE ABORTED - ErrorTestNGSuite
[scalatest] Exception encountered when invoking run on a nested suite.
[scalatest] java.lang.NullPointerException: message was null
[scalatest] org.scalatest.events.TestFailed.<init>(Event.scala:554)
[scalatest] org.scalatest.events.TestFailed$.apply(Event.scala:658)
[scalatest] org.scalatest.testng.TestNGSuite$MyTestListenerAdapter.onTestFailure(TestNGSuite.scala:270)
[scalatest] org.testng.internal.Invoker.runTestListeners(Invoker.java:1433)
[scalatest] org.testng.internal.Invoker.runTestListeners(Invoker.java:1417)
[scalatest] org.testng.internal.Invoker.handleInvocationResults(Invoker.java:1152)
[scalatest] org.testng.internal.Invoker.invokeTestMethods(Invoker.java:887)
[scalatest] org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
[scalatest] org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
[scalatest] org.testng.TestRunner.runWorkers(TestRunner.java:689)
[scalatest] org.testng.TestRunner.privateRun(TestRunner.java:566)
[scalatest] org.testng.TestRunner.run(TestRunner.java:466)
[scalatest] org.testng.SuiteRunner.runTest(SuiteRunner.java:301)
[scalatest] org.testng.SuiteRunner.runSequentially(SuiteRunner.java:296)
[scalatest] org.testng.SuiteRunner.privateRun(SuiteRunner.java:276)
[scalatest] org.testng.SuiteRunner.run(SuiteRunner.java:191)
[scalatest] org.testng.TestNG.createAndRunSuiteRunners(TestNG.java:808)
[scalatest] org.testng.TestNG.runSuitesLocally(TestNG.java:776)
[scalatest] org.testng.TestNG.run(TestNG.java:701)
[scalatest] org.scalatest.testng.TestNGSuite$class.run(TestNGSuite.scala:157)
[scalatest] org.scalatestexamples.testng.ErrorTestNGSuite.run(ErrorTestNGSuite.scala:21)
[scalatest] org.scalatest.testng.TestNGSuite$class.runTestNG(TestNGSuite.scala:144)
[scalatest] org.scalatestexamples.testng.ErrorTestNGSuite.runTestNG(ErrorTestNGSuite.scala:21)
[scalatest] org.scalatest.testng.TestNGSuite$class.run(TestNGSuite.scala:95)
[scalatest] org.scalatestexamples.testng.ErrorTestNGSuite.run(ErrorTestNGSuite.scala:21)
[scalatest] org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:58)
[scalatest] org.scalatest.tools.Runner$$anonfun$doRunRunRunADoRunRun$2.apply(Runner.scala:1429)
[scalatest] org.scalatest.tools.Runner$$anonfun$doRunRunRunADoRunRun$2.apply(Runner.scala:1426)
[scalatest] scala.List.foreach(List.scala:834)
[scalatest] org.scalatest.tools.Runner$.doRunRunRunADoRunRun(Runner.scala:1426)
[scalatest] org.scalatest.tools.RunnerJFrame$RunnerThread$$anonfun$run$1.apply(RunnerJFrame.scala:1351)
[scalatest] org.scalatest.tools.RunnerJFrame$RunnerThread$$anonfun$run$1.apply(RunnerJFrame.scala:1349)
[scalatest] org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:1470)
[scalatest] org.scalatest.tools.RunnerJFrame$RunnerThread.run(RunnerJFrame.scala:1348)
[
The "message was null" was not visible in the GUI.
compile-examples:
[scalac] Compiling 3 scala and 3 java source files to /Users/bv/nobkp/delus/st/target/examples
[scalac] /Users/bv/nobkp/delus/st/examples/org/scalatestexamples/easymock/EasyMockExampleFlatSpec.scala:42: error: overloaded method value in with alternatives ((_$2) => Unit)Unit <and> (=> Unit)Unit cannot be applied to (Boolean)
[scalac] "ClassTested" should "not call the collaborator when removing a non-existing document" in {
[scalac] ^
[scalac] one error found
I get an error in FlatSpec when the inferred result type isn't Unit for the in block. Had to put a () at the end.
I think the fix is that this type shouldn't be Unit, it should be Any.
Transform detail messages printed out in Graphic view, so that any \n characters become <br />.
Make sure all the SharedBehavior examples use by-name parameters to pass a stack creation function in, because
that object is mutable. Also add a little bit of text to the docs to point out that immutable things can be
simply passed in, but mutable ones need to be passed in as a function that can be called (most likely a by-name
parameter is most appropriate, as is used here.) (15 min)
In Spec (and probably at least WordSpec, and the fixture sisters) this needs to be changed to this. Because if the first thing inside a describe with
tests is an info, then it was not printing anything out. May need to be more tricky than this too,
but probably not. describe, info, info, describe, etc. (45 min)
if (desc.subNodes.isEmpty)
sendInfoProvidedMessage()
else
desc.subNodes.reverse.head match {
case _: DescriptionBranch => // Do nothing in this case (should never happen)
case _ => sendInfoProvidedMessage()
}
Only allow ignore to replace it in FlatSpec tests that start with it. (45 min.)
Maybe throw StackDepthExceptions for any kind of error in test code. (Later release)
Text:
Test fixtures:
fixture, the best approach => immutable fixture, one approach
it needs to be recreated => they need to be recreated
setup => setUp
BeforeAndAfter => BeforeAndAfterEach
consider two approaches => consider some approaches
In RunnerSuite, 'parseConfigSet was 'parseCOnfigSet, and it was passing, which tells me if invokePrivate
doesn't find the requested method name maybe it isn't failing. It needs to fail. No, I think the problem
was probably simply that tools wasn't being run.
Put deprecated final execute methods in that forward as best they can to the regular one, though
perhaps I just need the final execute forms for the interpreter and the one public execute. (1 hour)
Make a trait that can be mixed into
Reporter called TransitionalReporter, which has an apply method that forwards to the old methods, so people can bring existing reporters
up to date with a quick mix in. Or, consider whether I can just do that directly in Reporter itself. Oh, no, because then people's would
extensions would automatically work. No, that's OK. Just deprecate all the old testStarting, etc., methods. (4 hours)
Port whole thing to 2.8, and see how default params will change things. (1 day)
Put an Option[Nothing] in the run methods as a placeholder for the OutErrTester kind of stuff. Whatever that object is
that's getting passed around. OutErrManager maybe. Wierd, could even provide overloaded versions. Wait, I could do that
anyway. Just add it at the end later, and make.., no because then it would have to be final.
OutputManager, OutputTester. Those seem nicer. Anyway, it is for another day. OutputTester
Someone complained that if they configured the graphic reporter, that it should show that configuration by default not
just runs and failures. Not sure.
Do more testing on the FilterReporter config stuff.
I think I want to deprecate the use of -x for tags to exclude, to use it for XML Reporter. So in 0.9.6, -x should
still work, but so will some new one. And I'll warn folks that probably in 0.9.7, -x will start meaning xml reporter.
Refactor SuiteRerunner to just create a tools.SuiteRunner and call run on that. Maybe SuiteRunner should be in org.scalatest,
because it is also used by Distributor and will be used by SuiteRerunner.
add a RandomTestOrder trait?
Add the things for Property based testing displaying args nicely in the GUI (like empty strings should be "")
The eating error message problem. Make sure an exception message shows up in the GUI/Print output.
I'm not printing out the message in a formatted report, just the exception's detail message
Do an XML reporter and an HTML reporter
Make everything private in ScalaTestTask that can be private. I see a few things that are public I think unnecessarily.
The enter-after-be issue:
love the scala-test BDD-DSL (only weird thing was a false possitive
when I added an enter after a "be"
be
(
instead of
be (
The first case always passes :/ It would be better if it always failed.
Ask folks about run versus execute
Ask folks about TestCase/Suite compatibility (check about testNames, because if that doesn't work it really is a non-starter)
Ask folks about the beforeAll and afterAll in BeforeAndAfter
Ask folks about JUnit error instead of failures being fired
a *** file-system separator separated runpath (platform-runpath)
b
c - concurrent execution (--concurrent)
d
e - standard error reporter (--stderr-reporter)
f - file reporter
g - graphical reporter
h *** HTML Reporter
i
j *** some way to run existing Java JUnit tests from command line
k
l
m - members only path
n - tags to include
o - standard out reporter
p - space-separated runpath
q
r - custom reporter
s - suite class name
t - testNG XML config file
u
v *** xml reporter (v for verbose!)
w - wildcard path
x - tags to exclude
y
z
D - goodie pair
For HTML reporter, can pick a style sheet? Could be -hC for Colorful, else get pretty one like cobertura
-w and -m could take an option "Q" for quick discovery that uses naming conventions. It would only load
classes whose .class file names end in Spec or Suite.
George list:
1. Update build.xml. Right now compile and test only builds and tests
ShouldMatchers. You have to run gencode by hand and then recompile and
test to get MustMatchers, because MustMatchers is generated from
ShouldMatchers. Please modify the ant file so default task builds all
(test builds and tests all, compile compiles all, including the
MustMatchers). Then add a qbuild and qcompile that skips the gencode
so I can do quicker builds. It takes 5 minutes to do a full build
without MustMatchers, so that's long enough. Also, if it will work,
can you make a clean target that doesn't delete the matcher tests,
because that's what takes forever to compile. Maybe a qclean?
2. Modify ant task
- Add goodies to the ant task (leaving in properties as "deprecated"
for two releases) I renamed properties to goodies because there are
two other things called properties in ScalaTest (HavePropertyMatchers
and ScalaCheck property checks). Also, one guy thought properties
specified that way should be Java system properties. Calling them
goodies should avoid that confusion as well.
- Add tagsToInclude to the ant task (leaving in includes as
"deprecated" for two releases), to bring ant task in line with new
name.
- Add tagsToExclude to the ant task (leaving in excludes as
"deprecated" for two releases), to bring ant task in line with new
name.
- Add a -a runpath command line option, (also in the ant task but I'm
not sure under what name). Idea is that -p takes a space-separated
runpath, which works fine except when people have spaces in their
paths. I want to keep -p as is, because you can specify jar files with
URLs in there, but also provide another way to specify the runpath -a,
that uses the traditional path separated by platform-specific
separator character. (On Unix, a :, on Windows, a;, etc.) Please
suggest a name for this, maybe platformRunpath or something.
- Create a JUnitWrapperSuite, which can wrap an existing set of JUnit
tests, probably written in Java, but already compiled to binary
- Recommend something to do with -j. What I'd like people to be able
to do is use -j to point ScalaTest's Runner to some existing JUnit
tests, and have it create the JUnitWrapperSuite necessary to run them
from within ScalaTest.
- The JUnit Ant task does some discovery. I think it relies on things
being named Test. I'd like to be able to tell people they can do the
exact same discovery of JUnit tests with ScalaTest's ant task as they
can with JUnit's ant task. That way it is a migration path forward.
They should be able to run those old JUnit tests with similar stuff in
the ScalaTest ant task that they now put in the JUnit ant task.
- Add a "quick" option for suite discovery. Suite discovery takes a
long time already for ScalaTest testing itself, because Scala
generates so many darn class files. We're opening every single one
looking for suites. I think if they add a Q to their -w or -m's, like
-wQ or -mQ, then that batch should be done based on naming convention.
ScalaTest will only even open class files that end in either "Spec" or
"Suite" looking for classes that extend org.scalatest.Suite. We could
add Test in there if people request it, but frankly these classes
represent suites of tests not single tests usually, so I'd like to try
and get them out of the JUnit habit of calling the classes XTest. Plus
it helps differentiate when discovering in packages that have mixed
JUnit tests and ScalaTest Suites, which would speed up both kinds of
discovery.
3. Surefire support.
- Maven uses something called SureFire to run tests. A fellow named
Jan has started some integration here. Once you get to this point, let
me know and I'll find out where Jan is at so you can see if you want
to start there. I don't know much about SureFire, but I think we need
to support Maven as well as Ant to get Maven people to use ScalaTest.
4. HTML and XML reporters
- Dianne is doing an HTML reporter, so when you get to this one, let
me know and I'll see where she's at. But one thing is we want a -h
command line param to run the HTML reporter, and also add this to the
ant task.
- Do an XML reporter that always prints out everything no matter what
it is configured with. Print out the ordinal and everything. The
reason is this can be used as an output during concurrent tests which
can be read in and then sorted to produce other output.
"A Stack (with one item)" should behave like nonEmptyStack(lastValuePushed)(stackWithOneItem)
it should behave like nonFullStack(stackWithOneItem)
In FlatSpec, just support "it should behave like X" and if ShouldMatchers is mixed in "string should behave like X". No shared tests needed.
In Spec, just support "it should behave like X." No SharedTests mix in needed. So it("test name") will have to be an apply method on
the it object.
1.1
Do the parallel afterAll thing.
Add BeforeAndAfterEach, BeforeAndAfterAll. Make BeforeAndAfter just an extension of BeforeAndAfterEach and BeforeAndAfterAll and deprecate it.
BeforeAndAfterAll will need to look for some object sent down in goodies from OneInstancePerTest, so it knows not to do it if it is an
"isolated test instance" or something. And then it will also have to turn off the distributor. This would mean that DistributedTestExecution
would not happen if there's an AfterAll right now. Later, what I could do is BeforeAndAfterAll wraps the distributor, if it is defined, in
an AfterAllDistributor. And that guy would wrap the suites that are put into it in a SuiteWrapper that forwards the run invocation but when
it completes (in a finally) it notifies an AfterAllActor. This react actor knows which notifications to wait for, and when they are all done, it
executes the after all method. So my theory is that since I'm using react, these actors won't hold up threads. But what tangled complexity we weave when
we first learn to parallelize.
Don't do the OneArgXXX traits
From the SharedTests trait:
/**
* Trait that enables the same tests to be run on different fixture objects. In other words, it enables tests to be "shared"
* by different fixture objects.
*
* <p>
* To use the <code>SharedTests</code> trait, you first place shared tests in <em>behavior functions</em>. These behavior functions will be
* invoked during the construction phase of any suite that uses them, so that the tests they contain will be registered as tests in that suite.
* The <code>SharedTests</code>, therefore, can only be used in suites in which tests are represented by function values registered
* during suite object construction, such as ScalaTest's <code>FunSuite</code> and <code>Spec</code> classes. By contrast, trait
* <code>SharedTests</code> can't be mixed into suites such as ScalaTest's <code>Suite</code>, <code>JUnitSuite</code>, or
* <code>TestNGSuite</code>, in which tests are represented by methods. Any attempt to mix <code>SharedTests</code> into any such
* suite will not compile, because they don't conform to <code>SharedTest</code>'s self type, <code>TestRegistration</code>.
* </p>
*
* <p>
* For example, given this stack class:
* </p>
*
* <pre>
* import scala.collection.mutable.ListBuffer
*
* class Stack[T] {
*
* val MAX = 10
* private var buf = new ListBuffer[T]
*
* def push(o: T) {
* if (!full)
* o +: buf
* else
* throw new IllegalStateException("can't push onto a full stack")
* }
*
* def pop(): T = {
* if (!empty)
* buf.remove(0)
* else
* throw new IllegalStateException("can't pop an empty stack")
* }
*
* def peek: T = {
* if (!empty)
* buf(0)
* else
* throw new IllegalStateException("can't pop an empty stack")
* }
*
* def full: Boolean = buf.size == MAX
* def empty: Boolean = buf.size == 0
* def size = buf.size
*
* override def toString = buf.mkString("Stack(", ", ", ")")
* }
* </pre>
*
* <p>
* You may want to test the <code>Stack</code> class in different states: empty, full, with one item, with one item less than capacity,
* <em>etc</em>. You may find you have several tests that make sense any time the stack is non-empty. Thus you'd ideally want to run
* those same tests for three stack fixture objects: a full stack, a stack with a one item, and a stack with one item less than
* capacity. With <code>SharedTests</code>, you can factor these tests out into a behavior function, into which you pass the
* stack fixture to use when running the tests. So in your test suite for stack, you'd invoke the
* behavior function three times, passing in each of the three stack fixtures so that the shared tests are run for all three fixtures. You
* can define a behavior function that encapsulates these shared tests inside the suite you use them. If they are shared
* between different suites, however, you could also define them in a separate trait that is mixed into each suite that uses them.
* </p>
*
* <p>
* <a name="StackBehaviors">For</a> example, here the <code>nonEmptyStack</code> behavior function (here a behavior <em>method</em>) is defined in a trait along with another
* method containing shared tests for non-full stacks:
* </p>
*
* <pre>
* trait StackBehaviors { this: Spec =>
*
* def nonEmptyStack(lastItemAdded: Int)(stack: Stack[Int]) {
*
* it("should be non-empty") {
* assert(!stack.empty)
* }
*
* it("should return the top item on peek") {
* assert(stack.peek === lastItemAdded)
* }
*
* it("should not remove the top item on peek") {
* val size = stack.size
* assert(stack.peek === lastItemAdded)
* assert(stack.size === size)
* }
*
* it("should remove the top item on pop") {
* val size = stack.size
* assert(stack.pop === lastItemAdded)
* assert(stack.size === size - 1)
* }
* }
*
* def nonFullStack(stack: Stack[Int]) {
*
* it("should not be full") {
* assert(!stack.full)
* }
*
* it("should add to the top on push") {
* val size = stack.size
* stack.push(7)
* assert(stack.size === size + 1)
* assert(stack.peek === 7)
* }
* }
* }
* </pre>
*
*
* <p>
* In a behavior function, the fixture object must be passed in its own parameter list. If the shared tests need nothing more than
* the fixture object, then the fixture object's parameter list is the only parameter list, as in the <code>nonFullStack</code>
* method from the previous example:
* </p>
*
* <pre>
* def nonFullStack(stack: Stack[Int])
* </pre>
*
* <p>
* However, if the shared tests need other information in addition to the fixture object, that information must be
* passed in a separate parameter list. The behavior function must in that case be curried, with the parameter list
* for the fixture object coming last, as in the <code>nonEmptyStack</code> method from the previous example:
* </p>
*
* <pre>
* def nonEmptyStack(lastItemAdded: Int)(stack: Stack[Int])
* </pre>
*
* <p>
* Given these behavior functions, you could invoke them directly, but <code>SharedTests</code> offers a DSL for the purpose,
* which looks like this:
* </p>
*
* <pre>
* ensure (stackWithOneItem) behaves like (nonEmptyStack(lastValuePushed))
* ensure (stackWithOneItem) behaves like (nonFullStack)
* </pre>
*
* <p>
* If you prefer to use an imperative style to change fixtures, for example by mixing in <code>BeforeAndAfter</code> and
* reassigning a <code>stack</code> <code>var</code> in <code>beforeEach</code>, you could write your behavior functions
* in the context of that <code>var</code>, which means you wouldn't need to pass in the stack fixture because it would be
* in scope already inside the behavior function. In that case, you can
* use <code>it</code> in place of the fixture object, like this:
* </p>
*
* <pre>
* ensure it behaves like nonEmptyStack // assuming lastValuePushed is also in scope inside nonEmptyStack
* ensure it behaves like nonFullStack
* </pre>
*
* <p>
* The recommended style, however, is the functional, pass-all-the-needed-values-in style. Here's an example:
* </p>
*
* <pre>
* class SharedTestExampleSpec extends RefSpec with SharedTests with StackBehaviors {
*
* // Stack fixture creation methods
* def emptyStack = new Stack[Int]
*
* def fullStack = {
* val stack = new Stack[Int]
* for (i <- 0 until stack.MAX)
* stack.push(i)
* stack
* }
*
* def stackWithOneItem = {
* val stack = new Stack[Int]
* stack.push(9)
* stack
* }
*
* def stackWithOneItemLessThanCapacity = {
* val stack = new Stack[Int]
* for (i <- 1 to 9)
* stack.push(i)
* stack
* }
*
* val lastValuePushed = 9
*
* describe("A Stack") {
*
* describe("(when empty)") {
*
* it("should be empty") {
* assert(emptyStack.empty)
* }
*
* it("should complain on peek") {
* intercept[IllegalStateException] {
* emptyStack.peek
* }
* }
*
* it("should complain on pop") {
* intercept[IllegalStateException] {
* emptyStack.pop
* }
* }
* }
*
* describe("(with one item)") {
* ensure (stackWithOneItem) behaves like (nonEmptyStack(lastValuePushed))
* ensure (stackWithOneItem) behaves like (nonFullStack)
* }
*
* describe("(with one item less than capacity)") {
* ensure (stackWithOneItemLessThanCapacity) behaves like (nonEmptyStack(lastValuePushed))
* ensure (stackWithOneItemLessThanCapacity) behaves like (nonFullStack)
* }
*
* describe("(full)") {
*
* it("should be full") {
* assert(fullStack.full)
* }
*
* nonEmptyStack(lastValuePushed)(fullStack)
*
* it("should complain on a push") {
* intercept[IllegalStateException] {
* fullStack.push(10)
* }
* }
* }
* }
* }
* </pre>
*
* <p>
* If you load these classes into the Scala interpreter (with scalatest's JAR file on the class path), and execute it,
* you'll see:
* </p>
*
* <pre>
* scala> (new StackSpec).execute()
* A Stack (when empty)
* - should be empty
* - should complain on peek
* - should complain on pop
* A Stack (with one item)
* - should be non-empty
* - should return the top item on peek
* - should not remove the top item on peek
* - should remove the top item on pop
* - should not be full
* - should add to the top on push
* A Stack (with one item less than capacity)
* - should be non-empty
* - should return the top item on peek
* - should not remove the top item on peek
* - should remove the top item on pop
* - should not be full
* - should add to the top on push
* A Stack (full)
* - should be full
* - should be non-empty
* - should return the top item on peek
* - should not remove the top item on peek
* - should remove the top item on pop
* - should complain on a push
* </pre>
*
* <p>
* <strong>Obtaining unique test names</strong>
* </p>
*
* <p>
* One thing to keep in mind when using shared tests is that in ScalaTest, each test in a suite must have a unique name.
* If you register the same tests repeatedly in the same suite, one problem you may encounter is an exception at runtime
* complaining that multiple tests are being registered with the same test name. A good way to solve this problem in a <code>Spec</code> is to surround
* each invocation of a behavior function with a <code>describe</code> clause, which will prepend a string to each test name.
* For example, the following code in a <code>Spec</code> would register a test with the name <code>"A Stack (when empty) should be empty"</code>:
* </p>
*
* <pre>
* describe("A Stack") {
*
* describe("(when empty)") {
*
* it("should be empty") {
* assert(emptyStack.empty)
* }
* // ...
* </pre>
*
* <p>
* If the <code>"should be empty"</code> tests were factored out into a behavior function, it could be called repeatedly so long
* as each invocation of the behavior function is inside a different set of <code>describe</code> clauses. In a <code>FunSuite</code>
* there is no nesting construct analogous to <code>Spec</code>'s <code>describe</code> clause. If the duplicate test name problem shows up in a
* <code>FunSuite</code>, you'll need to pass in a prefix or suffix string to add to each test name. You can pass this string
* the same way you pass any other data needed by the shared tests, or just call <code>toString</code> on the shared fixture object.
* Here's an example of how <code>StackBehaviors</code> might look for a <code>FunSuite</code>:
* </p>
*
* <pre>
* trait StackBehaviors { this: FunSuite =>
*
* def nonEmptyStack(lastItemAdded: Int)(stack: Stack[Int]) {
*
* test(stack.toString + " should be non-empty") {
* assert(!stack.empty)
* }
*
* test(stack.toString + " should return the top item on peek") {
* assert(stack.peek === lastItemAdded)
* }
*
* test(stack.toString + " should not remove the top item on peek") {
* val size = stack.size
* assert(stack.peek === lastItemAdded)
* assert(stack.size === size)
* }
*
* test(stack.toString + " should remove the top item on pop") {
* val size = stack.size
* assert(stack.pop === lastItemAdded)
* assert(stack.size === size - 1)
* }
* }
*
* // ...
* }
* </pre>
*
* <p>
* Given this <code>StackBahaviors</code> trait, calling it with the <code>stackWithOneItem</code> fixture:
* </p>
*
* <pre>
* ensure (stackWithOneItem) behaves like (nonEmptyStack(lastValuePushed))
* </pre>
*
* <p>
* would yield test names:
* </p>
*
* <ul>
* <li><code>Stack(9) should be non-empty</code></li>
* <li><code>Stack(9) should return the top item on peek</code></li>
* <li><code>Stack(9) should not remove the top item on peek</code></li>
* <li><code>Stack(9) should remove the top item on pop</code></li>
* </ul>
*
* <p>
* Whereas calling it with the <code>stackWithOneItemLessThanCapacity</code> fixture:
* </p>
*
* <pre>
* ensure (stackWithOneItemLessThanCapacity) behaves like (nonEmptyStack(lastValuePushed))
* </pre>
*
* <p>
* would yield different test names:
* </p>
*
* <ul>
* <li><code>Stack(9, 8, 7, 6, 5, 4, 3, 2, 1) should be non-empty</code></li>
* <li><code>Stack(9, 8, 7, 6, 5, 4, 3, 2, 1) should return the top item on peek</code></li>
* <li><code>Stack(9, 8, 7, 6, 5, 4, 3, 2, 1) should not remove the top item on peek</code></li>
* <li><code>Stack(9, 8, 7, 6, 5, 4, 3, 2, 1) should remove the top item on pop</code></li>
* </ul>
*/
"A TimeSpan" can {
"be created from a number of milliseconds" in {
TimeSpan(3000) must_== TimeSpan(3 * 1000)
}
"be created from a number of seconds" in {
3.seconds must_== TimeSpan(3 * 1000)
}
"be created from a number of minutes" in {
3.minutes must_== TimeSpan(3 * 60 * 1000)
}
"be created from a number of hours" in {
3.hours must_== TimeSpan(3 * 60 * 60 * 1000)
}
"be created from a number of days" in {
3.days must_== TimeSpan(3 * 24 * 60 * 60 * 1000)
}
"be created from a number of weeks" in {
3.weeks must_== TimeSpan(3 * 7 * 24 * 60 * 60 * 1000)
}
"be converted implicitly to a date starting from the epoch time" in {
3.seconds.after(new Date(0)) must beTrue
}
"be converted to a date starting from the epoch time, using the date method" in {
3.seconds.after(new Date(0)) must beTrue
}
"be implicitly converted to a Long" in {
3.seconds must_== 3000L
}
"be compared to an int" in {
3.seconds must_== 3000
3.seconds must_!= 2000
}
"be compared to a long" in {
3.seconds must_== 3000L
3.seconds must_!= 2000L
}
"be compared to another TimeSpan" in {
3.seconds must_== 3.seconds
3.seconds must_!= 2.seconds
}
"be compared to another object" in {
3.seconds must_!= "string"
}
}
Thoughts on OutputManager. I would replace System.err and System.out with PrintStreams that are connected
to the OutputManager, which I pass in a Some to run. You can register a listener with the OutputManager and
unregister it. While registered, it will receive one "event" per call to the PrintStream methods. So I'd
do the loan pattern to basically say capture the thing.
val myListener = new OutputListener
outMan.addListener(myListener)
try {
// Some code
}
finally {
outMan.removeListener(myListener)
}
Can make a trait that has a withListener method:
val myListener = new OutputListener
outMan.withListener(myListener) { // Maybe listens to both std err and std out
}
outMan.withOutputListener(myListener) { // Maybe listens to only std out
}
outMan.withErrorListener(myListener) { // Maybe listens to only std err
}
Then in all my runTest methods, whew, I would have a:
outputManager match {
case None =>
case Some
yuck. Basically probably out an OutputManager, which does nothing with the listener if it is not listening
So this listener could be an OutputCollector, and I could pass it in goodies as "org.scalatest.OutputCollector"
Man, need to say just my thread or all threads.
outMan.withListenerAllThreads(myListener) { // Maybe listens to both std err and std out
}
outMan.withOutputListenerAllThreads(myListener) { // Maybe listens to only std out
}
outMan.withErrorListenerAllThreads(myListener) { // Maybe listens to only std err
}
Would want to give the Dispatcher's thread a unique name so it can not show up. Blech. Very ugly and complicated. Side effect city.
Yes, I think this makes sense. Only offer the withListener approach, because otherwise people could forget
to unregister a listener. The Listener is a trait, and I can offer a BufferListener, that is in=memory. But people
could put a file listener in there too if they wanted to write one. Could be called A Collector. Because that's really
what it is doing as it listens is collects. So I really need OutputManager to be a trait that has a do nothing one
and a real one.
outputAndError.captureWith(collector) {
}
capture stdOutAndErrWith collector {
}
capture stdOutWith collector {
}
val collector = new BufferCollector
capture stdErrWith collector {
}
import outMan._
stdErr.capture(collector) {
}
outMan.collectStdErr(collector)
collect(stdErr) {
}
Collector can be a function that takes a thing that is either stdErr, stdOut, or stdOutAndErr, which
could be members of outMan. The collect method could also be a member of outMan. So could say:
import outMan._
vall collect = new BufCollector
collect(stdErr) {
}
val stdErr = new BufCollector
outMan.collect(stdErr) {
}
val stdErr = outMan.collectStdErr {
}
import outMan._
val stdErr =
collectStdErr {
}
stdErr.all should include "expected output"
Actually, stdErr could simply be a List[String], right? Or a Seq[String].
Then could offer another collectStdErr method that takes a Collector. This one provides a collector that
buffers stuff in memory.
val seq =
collectStandardError {
}
assert(seq.find("bla") != -1)
Could offer a CollectorFixture that will fail if there's no Collector. Else it passes it in,
and tests can do tests based on standard input and output.
Can use this for the side-effecty fixture style:
import org.scalatest.fixture.FixtureFunSuite
class MySuite extends FixtureFunSuite {
type Fixture = Unit
def withFixture(fun: TestFunction) {
fun()
}
test("did this work") {
assert(1 + 1 === 3)
}
test("did this work yup") {