Added more tests

tests/ev_hash/seed_high_bits.c

@@ -0,0 +1,22 @@
+#define EV_HASH_IMPLEMENTATION
+#include "ev_macros.h"
+#include "ev_hash.h"
+
+#include <assert.h>
+#include <string.h>
+
+int main(void)
+{
+  const char *data = "same input";
+
+  u64 low_seed = 1;
+  u64 high_seed = (1ull << 32) | 1ull;
+
+  u64 low_hash = ev_hash_murmur3(data, (u32)strlen(data), low_seed);
+  u64 high_hash = ev_hash_murmur3(data, (u32)strlen(data), high_seed);
+
+  assert(low_seed != high_seed);
+  assert(low_hash != high_hash);
+
+  return 0;
+}