1 files changed, 45 insertions, 0 deletions
diff --git a/t/unit-tests/u-strcmp-offset.c b/t/unit-tests/u-strcmp-offset.c
new file mode 100644
index 0000000000..7e8e9acf3c
--- /dev/null
+++ b/t/unit-tests/u-strcmp-offset.c
@@ -0,0 +1,45 @@
+#include "unit-test.h"
+#include "read-cache-ll.h"
+
+static void check_strcmp_offset(const char *string1, const char *string2,
+				int expect_result, uintmax_t expect_offset)
+{
+	size_t offset;
+	int result = strcmp_offset(string1, string2, &offset);
+
+	/*
+	 * Because different CRTs behave differently, only rely on signs of the
+	 * result values.
+	 */
+	result = (result < 0 ? -1 :
+			result > 0 ? 1 :
+			0);
+
+	cl_assert_equal_i(result, expect_result);
+	cl_assert_equal_i((uintmax_t)offset, expect_offset);
+}
+
+void test_strcmp_offset__empty(void)
+{
+	check_strcmp_offset("", "", 0, 0);
+}
+
+void test_strcmp_offset__equal(void)
+{
+	check_strcmp_offset("abc", "abc", 0, 3);
+}
+
+void test_strcmp_offset__different(void)
+{
+	check_strcmp_offset("abc", "def", -1, 0);
+}
+
+void test_strcmp_offset__mismatch(void)
+{
+	check_strcmp_offset("abc", "abz", -1, 2);
+}
+
+void test_strcmp_offset__different_length(void)
+{
+	check_strcmp_offset("abc", "abcdef", -1, 3);
+}