BAEL 1861 (#4913)

* BAEL-1861 Replaced real tests with demo test "placeholders"

* BAEL-1861 Moved code from new module into existing ones

* BAEL-1861 Renamed main() classes to not violate PMD rules

testing-modules/testing/src/test/java/com/baeldung/runfromjava/FirstUnitTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.runfromjava;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertTrue;
+
+public class FirstUnitTest {
+
+    @Test
+    public void whenThis_thenThat() {
+        assertTrue(true);
+    }
+
+    @Test
+    public void whenSomething_thenSomething() {
+        assertTrue(true);
+    }
+
+    @Test
+    public void whenSomethingElse_thenSomethingElse() {
+        assertTrue(true);
+    }
+
+}

testing-modules/testing/src/test/java/com/baeldung/runfromjava/MyTestSuite.java

@@ -0,0 +1,10 @@
+package com.baeldung.runfromjava;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+
+@RunWith(Suite.class)
+@Suite.SuiteClasses({ FirstUnitTest.class, SecondUnitTest.class })
+public class MyTestSuite {
+
+}

testing-modules/testing/src/test/java/com/baeldung/runfromjava/RunJUnit4TestsFromJava.java

@@ -0,0 +1,93 @@
+package com.baeldung.runfromjava;
+
+import junit.extensions.ActiveTestSuite;
+import junit.extensions.RepeatedTest;
+import junit.framework.JUnit4TestAdapter;
+import junit.framework.Test;
+import junit.framework.TestSuite;
+import org.junit.internal.TextListener;
+import org.junit.runner.JUnitCore;
+import org.junit.runner.Result;
+import org.junit.runner.notification.Failure;
+
+public class RunJUnit4TestsFromJava {
+
+    public static void runOne() {
+        JUnitCore junit = new JUnitCore();
+        junit.addListener(new TextListener(System.out));
+        junit.run(FirstUnitTest.class);
+    }
+
+    public static void runAllClasses() {
+        JUnitCore junit = new JUnitCore();
+        junit.addListener(new TextListener(System.out));
+
+        Result result = junit.run(FirstUnitTest.class, SecondUnitTest.class);
+
+        for (Failure failure : result.getFailures()) {
+            System.out.println(failure.toString());
+        }
+
+        resultReport(result);
+    }
+
+    public static void runSuiteOfClasses() {
+        JUnitCore junit = new JUnitCore();
+        junit.addListener(new TextListener(System.out));
+        Result result = junit.run(MyTestSuite.class);
+
+        for (Failure failure : result.getFailures()) {
+            System.out.println(failure.toString());
+        }
+
+        resultReport(result);
+    }
+
+    public static void runRepeated() {
+        Test test = new JUnit4TestAdapter(SecondUnitTest.class);
+        RepeatedTest repeatedTest = new RepeatedTest(test, 5);
+
+        JUnitCore junit = new JUnitCore();
+        junit.addListener(new TextListener(System.out));
+
+        junit.run(repeatedTest);
+    }
+
+    public static void runRepeatedSuite() {
+        TestSuite mySuite = new ActiveTestSuite();
+
+        JUnitCore junit = new JUnitCore();
+        junit.addListener(new TextListener(System.out));
+
+        mySuite.addTest(new RepeatedTest(new JUnit4TestAdapter(FirstUnitTest.class), 5));
+        mySuite.addTest(new RepeatedTest(new JUnit4TestAdapter(SecondUnitTest.class), 3));
+
+        junit.run(mySuite);
+    }
+
+    public static void resultReport(Result result) {
+        System.out.println("Finished. Result: Failures: " +
+          result.getFailureCount() + ". Ignored: " +
+          result.getIgnoreCount() + ". Tests run: " +
+          result.getRunCount() + ". Time: " +
+          result.getRunTime() + "ms.");
+    }
+
+    public static void main(String[] args) {
+        System.out.println("\nRunning one test class:");
+        runOne();
+
+        System.out.println("\nRunning all test classes:");
+        runAllClasses();
+
+        System.out.println("\nRunning a suite of test classes:");
+        runSuiteOfClasses();
+
+        System.out.println("\nRunning repeated tests:");
+        runRepeated();
+
+        System.out.println("\nRunning repeated suite tests:");
+        runRepeatedSuite();
+    }
+
+}

testing-modules/testing/src/test/java/com/baeldung/runfromjava/SecondUnitTest.java

@@ -0,0 +1,18 @@
+package com.baeldung.runfromjava;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertTrue;
+
+public class SecondUnitTest {
+
+    @Test
+    public void whenSomething_thenSomething() {
+        assertTrue(true);
+    }
+
+    @Test
+    public void whensomethingElse_thenSomethingElse() {
+        assertTrue(true);
+    }
+}