1 files changed, 109 insertions, 0 deletions
diff --git a/t/unit-tests/u-hash.c b/t/unit-tests/u-hash.c
new file mode 100644
index 0000000000..bd4ac6a6e1
--- /dev/null
+++ b/t/unit-tests/u-hash.c
@@ -0,0 +1,109 @@
+#include "unit-test.h"
+#include "hex.h"
+#include "strbuf.h"
+
+static void check_hash_data(const void *data, size_t data_length,
+			    const char *expected_hashes[])
+{
+	cl_assert(data != NULL);
+
+	for (size_t i = 1; i < ARRAY_SIZE(hash_algos); i++) {
+		struct git_hash_ctx ctx;
+		unsigned char hash[GIT_MAX_HEXSZ];
+		const struct git_hash_algo *algop = &hash_algos[i];
+
+		algop->init_fn(&ctx);
+		git_hash_update(&ctx, data, data_length);
+		git_hash_final(hash, &ctx);
+
+		cl_assert_equal_s(hash_to_hex_algop(hash,algop), expected_hashes[i - 1]);
+	}
+}
+
+/* Works with a NUL terminated string. Doesn't work if it should contain a NUL character. */
+#define TEST_HASH_STR(data, expected_sha1, expected_sha256) do { \
+		const char *expected_hashes[] = { expected_sha1, expected_sha256 }; \
+		check_hash_data(data, strlen(data), expected_hashes); \
+	} while (0)
+
+/* Only works with a literal string, useful when it contains a NUL character. */
+#define TEST_HASH_LITERAL(literal, expected_sha1, expected_sha256) do { \
+		const char *expected_hashes[] = { expected_sha1, expected_sha256 }; \
+		check_hash_data(literal, (sizeof(literal) - 1), expected_hashes); \
+	} while (0)
+
+void test_hash__empty_string(void)
+{
+	TEST_HASH_STR("",
+		"da39a3ee5e6b4b0d3255bfef95601890afd80709",
+		"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
+}
+
+void test_hash__single_character(void)
+{
+	TEST_HASH_STR("a",
+		"86f7e437faa5a7fce15d1ddcb9eaeaea377667b8",
+		"ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb");
+}
+
+void test_hash__multi_character(void)
+{
+	TEST_HASH_STR("abc",
+		"a9993e364706816aba3e25717850c26c9cd0d89d",
+		"ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad");
+}
+
+void test_hash__message_digest(void)
+{
+	TEST_HASH_STR("message digest",
+		"c12252ceda8be8994d5fa0290a47231c1d16aae3",
+		"f7846f55cf23e14eebeab5b4e1550cad5b509e3348fbc4efa3a1413d393cb650");
+}
+
+void test_hash__alphabet(void)
+{
+	TEST_HASH_STR("abcdefghijklmnopqrstuvwxyz",
+		"32d10c7b8cf96570ca04ce37f2a19d84240d3a89",
+		"71c480df93d6ae2f1efad1447c66c9525e316218cf51fc8d9ed832f2daf18b73");
+}
+
+void test_hash__aaaaaaaaaa_100000(void)
+{
+	struct strbuf aaaaaaaaaa_100000 = STRBUF_INIT;
+	strbuf_addstrings(&aaaaaaaaaa_100000, "aaaaaaaaaa", 100000);
+	TEST_HASH_STR(aaaaaaaaaa_100000.buf,
+		"34aa973cd4c4daa4f61eeb2bdbad27316534016f",
+		"cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0");
+	strbuf_release(&aaaaaaaaaa_100000);
+}
+
+void test_hash__alphabet_100000(void)
+{
+	struct strbuf alphabet_100000 = STRBUF_INIT;
+	strbuf_addstrings(&alphabet_100000, "abcdefghijklmnopqrstuvwxyz", 100000);
+	TEST_HASH_STR(alphabet_100000.buf,
+		"e7da7c55b3484fdf52aebec9cbe7b85a98f02fd4",
+		"e406ba321ca712ad35a698bf0af8d61fc4dc40eca6bdcea4697962724ccbde35");
+	strbuf_release(&alphabet_100000);
+}
+
+void test_hash__zero_blob_literal(void)
+{
+	TEST_HASH_LITERAL("blob 0\0",
+		"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
+		"473a0f4c3be8a93681a267e3b1e9a7dcda1185436fe141f7749120a303721813");
+}
+
+void test_hash__three_blob_literal(void)
+{
+	TEST_HASH_LITERAL("blob 3\0abc",
+		"f2ba8f84ab5c1bce84a7b441cb1959cfc7093b7f",
+		"c1cf6e465077930e88dc5136641d402f72a229ddd996f627d60e9639eaba35a6");
+}
+
+void test_hash__zero_tree_literal(void)
+{
+	TEST_HASH_LITERAL("tree 0\0",
+		"4b825dc642cb6eb9a060e54bf8d69288fbee4904",
+		"6ef19b41225c5369f1c104d45d8d85efa9b057b53b14b4b9b939dd74decc5321");
+}