diff --git a/makefile b/makefile
index 1f15f75..e0a3a3a 100644
--- a/makefile
+++ b/makefile
@@ -35,8 +35,11 @@ $(program_obj_filesobj_files): %.o: %.c
 # --------------------------
 # Unit Tests
 # --------------------------
-unitTests:
-	echo "needs to be implemented"
+numbers_tests:
+	$(CC) $(FLAGS) numbers.c bintree.c stack.c unity.c test_numbers.c -o test_numbers
+
+stack_tests:
+	$(CC) $(FLAGS) stack.c unity.c stackunitytest.c -o test_stack
 
 # --------------------------
 # Clean
diff --git a/stacktest.exe b/stacktest.exe
deleted file mode 100644
index 38227e6..0000000
Binary files a/stacktest.exe and /dev/null differ
diff --git a/test_numbers.exe b/test_numbers.exe
new file mode 100644
index 0000000..db67879
Binary files /dev/null and b/test_numbers.exe differ
diff --git a/teststack.exe b/test_stack.exe
similarity index 62%
rename from teststack.exe
rename to test_stack.exe
index 11e07b3..781c0df 100644
Binary files a/teststack.exe and b/test_stack.exe differ