diff --git a/src/test/c/test_hangman_test.c b/src/test/c/test_hangman_test.c
index a092ee3..c8fe86b 100644
--- a/src/test/c/test_hangman_test.c
+++ b/src/test/c/test_hangman_test.c
@@ -63,4 +63,17 @@ void test_buchstabe_im_zu_erratenden_wort_eingabe_j_in_eoj_richtig() {
 	TEST_ASSERT_EQUAL_INT(expected, actual);
 }
 
+void test_erratene_buchstaben_hinzufuegen_anhaengen_r_an_leerstring_zu_peter_richtig() {
+    // arrange
+	char expected[100] = "r";
+    char actual[100] = "";
+	char to_add = 'r';
+	
+    // act
+	erratene_buchstaben_hinzufuegen(actual, to_add);
+
+    // assert
+	TEST_ASSERT_EQUAL_STRING(expected, actual);
+}
+
 #endif // TEST