1 files changed, 74 insertions, 0 deletions
diff --git a/source/blender/blenlib/tests/BLI_hash_mm2a_test.cc b/source/blender/blenlib/tests/BLI_hash_mm2a_test.cc
new file mode 100644
index 00000000000..c7bea8e15de
--- /dev/null
+++ b/source/blender/blenlib/tests/BLI_hash_mm2a_test.cc
@@ -0,0 +1,74 @@
+/* Apache License, Version 2.0 */
+
+#include "testing/testing.h"
+
+#include "BLI_hash_mm2a.h"
+
+/* Note: Reference results are taken from reference implementation
+ * (cpp code, CMurmurHash2A variant):
+ * https://smhasher.googlecode.com/svn-history/r130/trunk/MurmurHash2.cpp
+ */
+
+TEST(hash_mm2a, MM2ABasic)
+{
+  BLI_HashMurmur2A mm2;
+
+  const char *data = "Blender";
+
+  BLI_hash_mm2a_init(&mm2, 0);
+  BLI_hash_mm2a_add(&mm2, (const unsigned char *)data, strlen(data));
+#ifdef __LITTLE_ENDIAN__
+  EXPECT_EQ(BLI_hash_mm2a_end(&mm2), 1633988145);
+#else
+  EXPECT_EQ(BLI_hash_mm2a_end(&mm2), 959283772);
+#endif
+}
+
+TEST(hash_mm2a, MM2AConcatenateStrings)
+{
+  BLI_HashMurmur2A mm2;
+  uint32_t hash;
+
+  const char *data1 = "Blender";
+  const char *data2 = " is ";
+  const char *data3 = "FaNtAsTiC";
+  const char *data123 = "Blender is FaNtAsTiC";
+
+  BLI_hash_mm2a_init(&mm2, 0);
+  BLI_hash_mm2a_add(&mm2, (const unsigned char *)data1, strlen(data1));
+  BLI_hash_mm2a_add(&mm2, (const unsigned char *)data2, strlen(data2));
+  BLI_hash_mm2a_add(&mm2, (const unsigned char *)data3, strlen(data3));
+  hash = BLI_hash_mm2a_end(&mm2);
+  BLI_hash_mm2a_init(&mm2, 0);
+  BLI_hash_mm2a_add(&mm2, (const unsigned char *)data123, strlen(data123));
+#ifdef __LITTLE_ENDIAN__
+  EXPECT_EQ(hash, 1545105348);
+#else
+  EXPECT_EQ(hash, 2604964730);
+#endif
+  EXPECT_EQ(BLI_hash_mm2a_end(&mm2), hash);
+}
+
+TEST(hash_mm2a, MM2AIntegers)
+{
+  BLI_HashMurmur2A mm2;
+  uint32_t hash;
+
+  const int ints[4] = {1, 2, 3, 4};
+
+  BLI_hash_mm2a_init(&mm2, 0);
+  BLI_hash_mm2a_add_int(&mm2, ints[0]);
+  BLI_hash_mm2a_add_int(&mm2, ints[1]);
+  BLI_hash_mm2a_add_int(&mm2, ints[2]);
+  BLI_hash_mm2a_add_int(&mm2, ints[3]);
+  hash = BLI_hash_mm2a_end(&mm2);
+  BLI_hash_mm2a_init(&mm2, 0);
+  BLI_hash_mm2a_add(&mm2, (const unsigned char *)ints, sizeof(ints));
+  /* Yes, same hash here on little and big endian. */
+#ifdef __LITTLE_ENDIAN__
+  EXPECT_EQ(hash, 405493096);
+#else
+  EXPECT_EQ(hash, 405493096);
+#endif
+  EXPECT_EQ(BLI_hash_mm2a_end(&mm2), hash);
+}