diff --git a/src/tests.asm b/src/tests.asm
index 2a63e3e..5467e58 100644
--- a/src/tests.asm
+++ b/src/tests.asm
@@ -174,13 +174,13 @@ section .rodata
 	addTestHeader(_tolower, "tolower")
 	addTest(tolower_d, "tolower('d')")
 	addTest(tolower_D, "tolower('D')")
-	addTest(tolower_em, "tolower('em')")
+	addTest(tolower_em, "tolower('!')")
 	addTest(tolower_cb, "tolower('}')")
 	;toupper()
 	addTestHeader(_toupper, "toupper")
 	addTest(toupper_d, "toupper('d')")
 	addTest(toupper_D, "toupper('D')")
-	addTest(toupper_em, "toupper('em')")
+	addTest(toupper_em, "toupper('!')")
 	addTest(toupper_cb, "toupper('}')")
 	;min()
 	addTestHeader(_min, "min")
@@ -329,7 +329,7 @@ section .rodata
 	addTestHeader(_fwrite, "fwrite")
 	addTest(fwrite1, "fwrite(fp1, 'Hello world!\n') //mode 'a'")
 	addTest(fwrite2, "fwrite(fp1, 'How are you doing?\n') //mode 'a'")
-	addTest(fwrite3, "fwrite(fp1, 'Howdy environment!') //mode 'r'")
+	addTest(fwrite3, "fwrite(fp1, 'Howdy environment!') //mode 'w'")
 
 section .bss
 	strBuff1	resb	64