Added basic tests for hasher

Signed-off-by: dark0dave <dark0dave@mykolab.com>

test/hasher.spec.js

@@ -0,0 +1,27 @@
+const { murmurhash3_32_gc, murmurhash3_128_raw_gc } = require('../src/hasher.js');
+
+describe('helpers', () => {
+  describe('murmurhash3_32_gc', () => {
+    it('should return a hash', () => {
+      expect(murmurhash3_32_gc('Hello, World!', 100)).toBe(1305297264);
+    });
+
+    it('different seeds should return different hashes', () => {
+      expect(murmurhash3_32_gc('Hello, World!', 1) !== murmurhash3_32_gc('Hello, World!', 10));
+    });
+  });
+
+  describe('murmurhash3_128_raw_gc', () => {
+    it('should return a hash', () => {
+      expect(murmurhash3_128_raw_gc('Hello, World!', 100)).toEqual([1144378930, 1125695904, 3198765882, 690283472]);
+    });
+
+    it('can deal with huge strings', () => {
+      expect(murmurhash3_128_raw_gc(Array(65537).join('a'), 0)).toEqual([2724439033, 136575893, 411989173, 1597363643]);
+    });
+
+    it('different seeds should return different hashes', () => {
+      expect(murmurhash3_128_raw_gc('Hello, World!', 1) !== murmurhash3_128_raw_gc('Hello, World!', 10));
+    });
+  });
+});