BAEL-1852 moved the code into junit-5 module (#4915)

* BAEL-1852 moved the code into junit-5 module

* BAEL-1852 removed junit-abstract module from parent-modules

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/abstractmethod/AbstractMethodCalling.java

@@ -0,0 +1,17 @@
+/**
+ * 
+ */
+package com.baeldung.abstractclass.abstractmethod;
+
+/**
+ * When method calls abstract method.
+ */
+public abstract class AbstractMethodCalling {
+
+    public abstract String abstractFunc();
+
+    public String defaultImpl() {
+        String res = abstractFunc();
+        return (res == null) ? "Default" : (res + " Default");
+    }
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/indepedentmethod/AbstractIndependent.java

@@ -0,0 +1,14 @@
+package com.baeldung.abstractclass.indepedentmethod;
+
+/**
+ * Test Independent Method
+ * 
+ */
+public abstract class AbstractIndependent {
+
+    public abstract int abstractFunc();
+
+    public String defaultImpl() {
+        return "DEFAULT-1";
+    }
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/indepedentmethod/ConcreteImpl.java

@@ -0,0 +1,10 @@
+package com.baeldung.abstractclass.indepedentmethod;
+
+public class ConcreteImpl extends AbstractIndependent {
+
+    @Override
+    public int abstractFunc() {
+        return 4;
+    }
+
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/instancefields/AbstractInstanceFields.java

@@ -0,0 +1,22 @@
+package com.baeldung.abstractclass.instancefields;
+
+/**
+ * Test Independent Method
+ */
+public abstract class AbstractInstanceFields {
+
+    protected int count;
+    private boolean active = false;
+
+    public abstract int abstractFunc();
+
+    public String testFunc() {
+        String response;
+        if (count > 5) {
+            response = "Overflow";
+        } else {
+            response = active ? "Added" : "Blocked";
+        }
+        return response;
+    }
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/privatemethod/AbstractPrivateMethods.java

@@ -0,0 +1,17 @@
+package com.baeldung.abstractclass.privatemethod;
+
+import java.time.LocalDateTime;
+
+public abstract class AbstractPrivateMethods {
+
+    public abstract int abstractFunc();
+
+    public String defaultImpl() {
+        return getCurrentDateTime() + "DEFAULT-1";
+    }
+
+    private String getCurrentDateTime() {
+        return LocalDateTime.now()
+            .toString();
+    }
+}