diff --git a/assignment/src/test/java/appointmentplanner/AppointmentDataTest.java b/assignment/src/test/java/appointmentplanner/AppointmentDataTest.java
new file mode 100644
index 0000000..585dcb3
--- /dev/null
+++ b/assignment/src/test/java/appointmentplanner/AppointmentDataTest.java
@@ -0,0 +1,33 @@
+package appointmentplanner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import appointmentplanner.api.AppointmentData;
+import java.time.Duration;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+public class AppointmentDataTest {
+
+  @ParameterizedTest
+  @CsvSource({ "56", "-5", "30" })
+  void getDurationTest(long duration) {
+    Duration dur = Duration.ofHours(duration);
+
+    AppointmentData instnace = new AppointmentDataImpl(dur, "smth");
+
+    assertThat(instnace.duration()).isEqualTo(dur);
+  }
+
+  @ParameterizedTest
+  @CsvSource({ "one", "two", "three" })
+  void getDescriptionTest(String desc) {
+    String descString = desc;
+
+    AppointmentData instance = new AppointmentDataImpl(
+        Duration.ofDays(5),
+        desc);
+
+    assertThat(instance.description()).isEqualTo(descString);
+  }
+}