diff --git a/src/test/java/de/edu/hsfulda/pmut/UebungTesten.java b/src/test/java/de/edu/hsfulda/pmut/UebungTesten.java
index 08b16ac..2f15304 100644
--- a/src/test/java/de/edu/hsfulda/pmut/UebungTesten.java
+++ b/src/test/java/de/edu/hsfulda/pmut/UebungTesten.java
@@ -15,5 +15,20 @@ class UebungTesten {
 		// act
 		String result = berechnung.convert(2);
 		// assert
+		assertThat(result).as("ordinary number ").isEqualTo(expected);
+	}
+
+	@Test
+	void convert_5_to_buzz() {
+		String expected = "Buzz";
+		String result = berechnung.convert(5);
+		assertThat(result).as("dividable by 5").isEqualTo(expected);
+	}
+
+	@Test
+	void gcd_15_20_to_5() {
+		int expected = 5;
+		int result = berechnung.gcd(7*13,7*144);
+		assertThat(result).as("%d / %d",7*13,7*144).isEqualTo(expected);
 	}
 }