PY-14221: Do not instantiate unittest runner explicitly

See Leonid's comments on https://github.com/JetBrains/teamcity-messages/issues/135

python/helpers/pycharm/_jb_unittest_runner.py

@@ -30,8 +30,6 @@ if __name__ == '__main__':
         additional_args += targets
     args += additional_args
     jb_doc_args("unittests", args)
-    test_runner = unittestpy.TeamcityTestRunner()
-    test_runner.buffer = True
     # Working dir should be on path, that is how unittest work when launched from command line
     sys.path.append(os.getcwd())
-    main(argv=args, module=None, testRunner=test_runner)
+    main(argv=args, module=None, testRunner=unittestpy.TeamcityTestRunner, buffer=True)

python/testData/testRunner/env/unit/failFast/test_test.py

@@ -0,0 +1,11 @@
+from unittest import TestCase
+
+class SomeTestCase(TestCase):
+    def test_1_test(self):
+        assert False
+
+    def test_2_test(self):
+        pass
+
+    def test_3_test(self):
+        assert False

python/testSrc/com/jetbrains/env/python/testing/PythonUnitTestingTest.java

@@ -52,6 +52,46 @@ import static org.junit.Assert.assertEquals;
 public final class PythonUnitTestingTest extends PyEnvTestCase {
 
 
+
+  /**
+   * tests failfast as example of argument
+   */
+  @Test
+  public void testFailFast() throws Exception {
+
+    runPythonTest(new PyUnitTestProcessWithConsoleTestTask("testRunner/env/unit/failFast", "test_test.py") {
+
+      @NotNull
+      @Override
+      protected PyUnitTestProcessRunner createProcessRunner() throws Exception {
+        return new PyUnitTestProcessRunner(toFullPath(myScriptName), 1){
+          @Override
+          protected void configurationCreatedAndWillLaunch(@NotNull final PyUniversalUnitTestConfiguration configuration) throws IOException {
+            super.configurationCreatedAndWillLaunch(configuration);
+            configuration.setAdditionalArguments("-f"); //FailFast
+          }
+        };
+      }
+
+      @Override
+      protected void checkTestResults(@NotNull final PyUnitTestProcessRunner runner,
+                                      @NotNull final String stdout,
+                                      @NotNull final String stderr,
+                                      @NotNull final String all) {
+        Assert.assertEquals("Runner did not stop after first fail", 1, runner.getAllTestsCount());
+        runner.getFormattedTestTree();
+        Assert.assertEquals("Bad tree produced for failfast", "Test tree:\n" +
+                                "[root]\n" +
+                                ".test_test\n" +
+                                "..SomeTestCase\n" +
+                                "...test_1_test(-)\n", runner.getFormattedTestTree());
+      }
+    });
+  }
+
+
+
+
   /**
    * tests with docstrings are reported as "test.name (text)" by unittest.
    */