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@@ -22,3 +22,35 @@ Essentially, this will generate a default minimalistic jet functional SpringBoot
 
 # TDD
 
+## myFirstTest
+
+Let's start with the simplest thing you can imagine: a single test method with a single statement. Create [src/test/java/example/cashcard/CashCardJsonTest.java](http://192.168.8.55:3000/HQLAx/FamilyCashCard/src/commit/5ff71154302523ab5ebd0a291e3f5819aed8fdb9/src/test/java/djmil/cashcard/CashCardJsonTest.java): 
+
+``` java
+package example.cashcard;
+
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class CashCardJsonTest {
+
+@Test
+    public void myFirstTest() {
+        assertThat(1).isEqualTo(42);
+    }
+}
+```
+
+The `@Test` annotation is part of the JUnit library, and the `assertThat` method is part of the AssertJ library. Both of these libraries are imported after the package statement.
+
+A common convention (but not a requirement) is to always use the Test suffix for test classes. We’ve done that here. The full class name CashCardJsonTest.java gives you a clue about the nature of the test we're about to write.
+
+In true Test-First fashion, we've written a failing test first. It's important to have a failing test first so you can have high confidence that whatever you did to fix the test actually worked.
+
+Toggle terminal with `ctrl+tilda` and type 
+
+```bash
+./gradlew test
+```
+
+## Testing the Data Contract