Minor annoyances with Amber tests (#612)

* Make postprocessors optional in integration tests.

* Move import validity test files to subdirectory.

* Rename integration test function.

* Rename test file as requested.

src/tests/postprocessor.rs

@@ -4,27 +4,18 @@ use crate::tests::eval_bash;
 use super::compile_code;
 
 #[test]
-fn default_ok() {
-    let default = PostProcessor::get_default();
-
+fn test_each_installed_postprocessor() {
     let hello = "echo \"Hello world!\"";
     let hello = compile_code(hello);
 
-    let mut unavailable = vec![];
-
-    for processor in &default {
-        if ! processor.is_available() {
-            unavailable.push(processor.name.clone());
+    let processors = PostProcessor::get_default();
+    for processor in processors {
+        if processor.is_available() {
+            let res = processor.execute(hello.clone());
+            assert!(res.is_ok(), "Postprocessor {} couldn't process hello world", processor.name);
+            let res = res.unwrap();
+            let (stdout, _) = eval_bash(res);
+            assert_eq!(stdout, "Hello world!");
         }
     }
-
-    assert!(unavailable.is_empty(), "These commands have to be in $PATH for this test to pass: {}", unavailable.join(", "));
-
-    for processor in default {
-        let res = processor.execute(hello.clone());
-        assert!(res.is_ok(), "Postprocessor {} couldn't process hello world", processor.name);
-        let res = res.unwrap();
-        let (stdout, _) = eval_bash(res);
-        assert_eq!(stdout, "Hello world!");
-    }
 }

src/tests/validity/import_existing_file.ab

@@ -1,2 +1,3 @@
-import * from "test_files/str/trim.ab"
-echo trim("    Succeeded     ")
+import * from "src/tests/validity/test_files/str/trim.ab"
+
+echo trim("    Succeeded    ")

src/tests/validity/import_existing_nested_file.ab

@@ -1,4 +1,4 @@
-import * from "test_files/is_even.ab"
+import * from "src/tests/validity/test_files/is_even.ab"
 
 // Output
 // even

src/tests/validity/import_transitive_file.ab

@@ -0,0 +1,3 @@
+import * from "src/tests/validity/test_files/is_even.ab"
+
+echo trim("    Succeeded    ")