[PATCH v2 3/3] lib/test-string_helpers.c: add string_get_size() tests

[Vitaly Kuznetsov <vkuznets@redhat.com>]

Add a couple of simple tests for string_get_size().

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
Changes since v1:
- Make test_string_get_size_one() check both STRING_UNITS_2 and
  STRING_UNITS_10 in one shot [Rasmus Villemoes]
- Check U64_MAX instead of some-very-big-number.
---
 lib/test-string_helpers.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/lib/test-string_helpers.c b/lib/test-string_helpers.c
index 8e376ef..4c77b54 100644
--- a/lib/test-string_helpers.c
+++ b/lib/test-string_helpers.c
@@ -326,6 +326,61 @@ out:
 	kfree(out_test);
 }
 
+#define string_get_size_maxbuf 16
+#define test_string_get_size_one(size, blk_size, exp_result10, exp_result2)    \
+	do {                                                                   \
+		BUILD_BUG_ON(sizeof(exp_result10) >= string_get_size_maxbuf);  \
+		BUILD_BUG_ON(sizeof(exp_result2) >= string_get_size_maxbuf);   \
+		__test_string_get_size((size), (blk_size), (exp_result10),     \
+				       (exp_result2));                         \
+	} while (0)
+
+
+static __init void __test_string_get_size(const u64 size, const u32 blk_size,
+					  const char *exp_result10,
+					  const char *exp_result2)
+{
+	char buf10[string_get_size_maxbuf];
+	char buf2[string_get_size_maxbuf];
+
+	string_get_size(size, blk_size, STRING_UNITS_10, buf10, sizeof(buf10));
+	string_get_size(size, blk_size, STRING_UNITS_2, buf2, sizeof(buf2));
+
+	if (!memcmp(buf10, exp_result10, strlen(exp_result10) + 1))
+		goto check_stringunits_2;
+
+	buf10[sizeof(buf10) - 1] = '\0';
+
+	pr_warn("Test 'test_string_get_size' failed!\n");
+	pr_warn("string_get_size(size = %llu, blk_size = %u, units = %s)\n",
+		size, blk_size, "STRING_UNITS_10");
+	pr_warn("expected: '%s', got '%s'\n", exp_result10, buf10);
+
+check_stringunits_2:
+	if (!memcmp(buf2, exp_result2, strlen(exp_result2) + 1))
+		return;
+
+	buf2[sizeof(buf2) - 1] = '\0';
+
+	pr_warn("Test 'test_string_get_size' failed!\n");
+	pr_warn("string_get_size(size = %llu, blk_size = %u, units = %s)\n",
+		size, blk_size, "STRING_UNITS_2");
+	pr_warn("expected: '%s', got '%s'\n", exp_result2, buf2);
+}
+
+static __init void test_string_get_size(void)
+{
+	test_string_get_size_one(16384, 512, "8.38 MB", "8.00 MiB");
+	test_string_get_size_one(500118192, 512, "256 GB", "238 GiB");
+	test_string_get_size_one(8192, 4096, "33.5 MB", "32.0 MiB");
+	test_string_get_size_one(1100, 1, "1.10 kB", "1.07 KiB");
+	test_string_get_size_one(3000, 1900, "5.70 MB", "5.43 MiB");
+	test_string_get_size_one(U64_MAX, 4096, "75.5 ZB", "63.9 ZiB");
+	test_string_get_size_one(1999, U32_MAX, "8.58 TB", "7.80 TiB");
+	test_string_get_size_one(1, 512, "512 B", "512 B");
+	test_string_get_size_one(0, 512, "0 B", "0 B");
+}
+
 static int __init test_string_helpers_init(void)
 {
 	unsigned int i;
@@ -344,6 +399,9 @@ static int __init test_string_helpers_init(void)
 	for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
 		test_string_escape("escape 1", escape1, i, TEST_STRING_2_DICT_1);
 
+	/* Test string_get_size() */
+	test_string_get_size();
+
 	return -EINVAL;
 }
 module_init(test_string_helpers_init);
-- 
2.4.3