Merge branch 'master' into exclude_pattern

README.md

@@ -164,12 +164,29 @@ Example of running job 4 out of 32 jobs:
 minitest_booster --job 4/32
 ```
 
-Under the hood, the Minitest Booster uses the following command:
+If minitest booster is executed in a scope of a Rails project, the following is
+executed:
+
+``` bash
+bundle exec rails test <file_list>
+```
+
+If minitest booster is running outside of a Rails project, the following is
+executed:
 
 ``` bash
 ruby -e 'ARGV.each { |f| require ".#{f}" }' <file_list>
 ```
 
+If you want to run a custom command for minitest, use the
+`MINITEST_BOOSTER_COMMAND` environment variable:
+
+``` bash
+export MINITEST_BOOSTER_COMMAND="bundle exec rake test"
+
+minitest_booster --job 1/42
+```
+
 ## ExUnit Booster
 
 The `ex_unit_booster` loads all the files that match the `test/**/*_test.exs`

lib/test_boosters/boosters/minitest.rb

@@ -9,13 +9,33 @@ def initialize
       end
 
       def command
-        "ruby -e 'ARGV.each { |f| require \"./\#{f}\" }'"
+        if command_set_with_env_var?
+          command_from_env_var
+        elsif rails_app?
+          "bundle exec rails test"
+        else
+          "ruby -e 'ARGV.each { |f| require \"./\#{f}\" }'"
+        end
       end
 
       def split_configuration_path
         ENV["MINITEST_SPLIT_CONFIGURATION_PATH"] || "#{ENV["HOME"]}/minitest_split_configuration.json"
       end
 
+      def command_set_with_env_var?
+        !command_from_env_var.empty?
+      end
+
+      def command_from_env_var
+        ENV["MINITEST_BOOSTER_COMMAND"].to_s
+      end
+
+      private
+
+      def rails_app?
+        File.exist?("app") && File.exist?("config") && File.exist?("config/application.rb")
+      end
+
     end
   end
 end

lib/test_boosters/version.rb

@@ -1,3 +1,3 @@
 module TestBoosters
-  VERSION = "2.5.0".freeze
+  VERSION = "2.6.0".freeze
 end

spec/lib/test_boosters/boosters/minitest_spec.rb

@@ -24,4 +24,36 @@
       end
     end
   end
+
+  describe "#command" do
+    before do
+      ENV["MINITEST_BOOSTER_COMMAND"] = "" # reset the environment
+    end
+
+    context "when the command is passed as env var" do
+      let(:command) { "bundle exec rake test" }
+
+      it "uses that command" do
+        ENV["MINITEST_BOOSTER_COMMAND"] = command
+
+        expect(booster.command).to eq(command)
+      end
+    end
+
+    context "when the command is not passed as env var, but we are in a rails env" do
+      it "uses a rails specific command" do
+        allow(booster).to receive(:rails_app?).and_return(true)
+
+        expect(booster.command).to eq("bundle exec rails test")
+      end
+    end
+
+    context "when there is no env command, and not in rails" do
+      it "uses a 'require' command" do
+        allow(booster).to receive(:rails_app?).and_return(false)
+
+        expect(booster.command).to eq("ruby -e 'ARGV.each { |f| require \"./\#{f}\" }'")
+      end
+    end
+  end
 end