diff --git a/src/test/c/Tim/test_hangman.c b/src/test/c/Tim/test_hangman.c
index 3701b67..e2b04da 100644
--- a/src/test/c/Tim/test_hangman.c
+++ b/src/test/c/Tim/test_hangman.c
@@ -80,3 +80,46 @@ void test_wordGuessed_differentCaps()
 }
 
 
+void test_letterGuessed_differentCaps_small_big()
+{
+    //arrange
+    char x ='F';
+    char y[] ="Kartoffel";
+    int length = 9;
+    char z[] ="_________";
+    //assert
+    TEST_ASSERT_TRUE(letterGuessed(x,y,length,z));
+}
+
+void test_letterGuessed_differentCaps_big_small()
+{
+    //arrange
+    char x ='k';
+    char y[] ="Kartoffel";
+    int length = 9;
+    char z[] ="_________";
+    //assert
+    TEST_ASSERT_TRUE(letterGuessed(x,y,length,z));
+}
+void test_letterGuessed_sameCaps_small()
+{
+    //arrange
+    char x ='f';
+    char y[] ="Kartoffel";
+    int length = 9;
+    char z[] ="_________";
+    //assert
+    TEST_ASSERT_TRUE(letterGuessed(x,y,length,z));
+}
+
+void test_letterGuessed_sameCaps_big()
+{
+    //arrange
+    char x ='K';
+    char y[] ="Kartoffel";
+    int length = 9;
+    char z[] ="_________";
+    //assert
+    TEST_ASSERT_TRUE(letterGuessed(x,y,length,z));
+}
+