Add test examples.

src/main/java/space/kklochko/simple_jbdd/test_examples/tests/SimpleFailedThenTest.java

@@ -0,0 +1,12 @@
+package space.kklochko.simple_jbdd.test_examples.tests;
+
+import space.kklochko.simple_jbdd.annotations.Then;
+import space.kklochko.simple_jbdd.tests.Test;
+
+public class SimpleFailedThenTest extends Test {
+    @Then
+    public void check() {
+        assert 30 == 10 + 20 + 1;
+    }
+}
+

src/main/java/space/kklochko/simple_jbdd/test_examples/tests/SimpleGivenWhenThenTest.java

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+package space.kklochko.simple_jbdd.test_examples.tests;
+
+import space.kklochko.simple_jbdd.annotations.Given;
+import space.kklochko.simple_jbdd.annotations.Then;
+import space.kklochko.simple_jbdd.annotations.When;
+import space.kklochko.simple_jbdd.test_examples.samples.Sum;
+import space.kklochko.simple_jbdd.tests.Test;
+
+public class SimpleGivenWhenThenTest extends Test {
+    private Sum sum;
+    private int a;
+    private int b;
+
+    @Given
+    void setup() {
+        sum = new Sum();
+    }
+
+    @When
+    void trigger() {
+        a = 10;
+        b = 20;
+    }
+
+    @Then
+    void check() {
+        assert 30 == sum.sum(a, b);
+    }
+}
+

src/main/java/space/kklochko/simple_jbdd/test_examples/tests/SimpleThenTest.java

@@ -0,0 +1,12 @@
+package space.kklochko.simple_jbdd.test_examples.tests;
+
+import space.kklochko.simple_jbdd.annotations.Then;
+import space.kklochko.simple_jbdd.tests.Test;
+
+public class SimpleThenTest extends Test {
+    @Then
+    public void check() {
+        assert 30 == 10 + 20;
+    }
+}
+