diff --git a/SimpleActivityStack/src/testat/ASimpleActivityStackTest.java b/SimpleActivityStack/src/testat/ASimpleActivityStackTest.java
new file mode 100644
index 0000000..5a3221f
--- /dev/null
+++ b/SimpleActivityStack/src/testat/ASimpleActivityStackTest.java
@@ -0,0 +1,58 @@
+package testat;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * 
+ * @author cm
+ *
+ */
+public abstract class ASimpleActivityStackTest extends ASimpleStackTestBase<SimpleActivity> {
+
+	@Override
+	protected void init() {
+		s1 = new SimpleActivity("s1");
+		s2 = new SimpleActivity("s2");
+		s3 = new SimpleActivity("s3");
+		s4 = new SimpleActivity("s4");
+		s5 = new SimpleActivity("s5");
+		s6 = new SimpleActivity("s6", "negativ", false);
+		s7 = new SimpleActivity("s7", "negativ", false);
+		s8 = new SimpleActivity("s8", "negativ", false);
+		s9 = new SimpleActivity("s9", "negativ", false);
+		s10 = new SimpleActivity("s10", "negativ", false);
+
+		act1 = new IAction<SimpleActivity>() {
+
+			@Override
+			public void execute(SimpleActivity e) {
+				temp1 = temp1 || e.isActive();
+			}
+		};
+
+		act2 = new IAction<SimpleActivity>() {
+
+			@Override
+			public void execute(SimpleActivity e) {
+				temp2 = temp2 && e.isActive();
+			}
+		};
+
+	}
+
+	@Test
+	public void testPushActivity_1() {
+		sstack.push(s1);
+		assertEquals(true, sstack.contains(s1));
+		assertEquals(true, sstack.get(0).isActive());
+	}
+
+	@Test
+	public void testPushActivity_2() {
+		sstack.push(s6);
+		assertEquals(true, sstack.contains(s6));
+		assertEquals(true, sstack.get(0).isActive());
+	}
+}
diff --git a/SimpleActivityStack/src/testat/ASimpleStackTest.java b/SimpleActivityStack/src/testat/ASimpleStackTest.java
new file mode 100644
index 0000000..166415e
--- /dev/null
+++ b/SimpleActivityStack/src/testat/ASimpleStackTest.java
@@ -0,0 +1,41 @@
+package testat;
+
+/**
+ * 
+ * @author cm
+ *
+ */
+
+public abstract class ASimpleStackTest extends ASimpleStackTestBase<String> {
+
+	@Override
+	protected void init() {
+		s1 = "T-s1";
+		s2 = "T-s2";
+		s3 = "T-s3";
+		s4 = "T-s4";
+		s5 = "T-s5";
+		s6 = "T-s6";
+		s7 = "T-s7";
+		s8 = "T-s8";
+		s9 = "T-s9";
+		s10 = "T-s10";
+
+		act1 = new IAction<String>() {
+
+			@Override
+			public void execute(String e) {
+				temp1 = temp1 || e.contains("T");
+			}
+		};
+
+		act2 = new IAction<String>() {
+
+			@Override
+			public void execute(String e) {
+				temp2 = temp2 && e.contains("T");
+			}
+		};
+	}
+
+}