Added automatic tests for junit samples

util/test/AbstractTestExamples.kt

@@ -1,11 +1,14 @@
 import atomictest.ERROR_TAG
 import org.junit.Assert
+import org.junit.runner.JUnitCore
 import util.LINE_SEPARATOR
 import util.normalizeLineSeparators
 import java.io.*
 import java.util.function.Consumer
 
 abstract class AbstractTestExamples {
+  private val junit = JUnitCore()
+
   protected fun testExample(fileName: String, main: Runnable) {
     testExample(fileName, Consumer { main.run() })
   }
@@ -26,9 +29,9 @@ abstract class AbstractTestExamples {
     }
   }
 
-  protected fun testExercise(outputFileName: String, main: Consumer<Array<String>>) {
-    val output = File(outputFileName).readText()
-    testOutput(output, main, trim = false)
+  protected fun testUnitTest(testClass: Class<*>) {
+    val result = junit.run(testClass)
+    Assert.assertTrue(result.wasSuccessful())
   }
 
   private fun extractOutput(exampleCode: String, outputComment: String) =

util/test/AbstractTestExercises.kt

@@ -1,7 +1,6 @@
 import org.junit.After
 import org.junit.Assert
 import org.junit.runner.JUnitCore
-import util.loadTraceContent
 import util.resetTraceContent
 import util.runAndCheckSystemOutput
 import java.io.File

util/test/TestAllExamples.java

@@ -2206,6 +2206,21 @@ public class TestAllExamples extends AbstractTestExamples {
         testExample("Preventing Failure/Unit Testing/Examples/src/UsingExpect.kt", unittesting.UsingExpectKt::main);
     }
 
+    @Test
+    public void testSampleTest() {
+        testUnitTest(unittesting.SampleTest.class);
+    }
+
+    @Test
+    public void testLearnerTest() {
+        testUnitTest(unittesting.LearnerTest.class);
+    }
+
+    @Test
+    public void testStateMachineTest() {
+        testUnitTest(unittesting.StateMachineTest.class);
+    }
+
     @Test
     public void testTransform() {
         testExample("Power Tools/Extension Lambdas/Examples/src/Transform.kt", extensionlambdas.TransformKt::main);