diff --git a/unittests/test_20.c b/unittests/test_20.c
new file mode 100644
index 0000000..04cd81a
--- /dev/null
+++ b/unittests/test_20.c
@@ -0,0 +1,8 @@
+#include "tests.h"
+
+void test_20()
+{
+    printf("TEST 20 STARTET\n");
+    assert(!compareStrings("sauber", "sauber"));
+    printf("TEST 20 ERFOLGREICH\n");
+}
\ No newline at end of file
diff --git a/unittests/test_main.c b/unittests/test_main.c
index 84bbc7f..04c2237 100644
--- a/unittests/test_main.c
+++ b/unittests/test_main.c
@@ -22,4 +22,6 @@ int main()
     test_16();
     test_17();
     test_18();
+    test_19();
+    test_20();
 }
\ No newline at end of file
diff --git a/unittests/tests.h b/unittests/tests.h
index 4ac1e64..064c319 100644
--- a/unittests/tests.h
+++ b/unittests/tests.h
@@ -22,4 +22,6 @@ void test_14();
 void test_15();
 void test_16();
 void test_17();
-void test_18();
\ No newline at end of file
+void test_18();
+void test_19();
+void test_20();
\ No newline at end of file