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test/unit/murmurhash3_spec.js

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+/* Copyright 2017 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { MurmurHash3_64 } from "../../src/shared/murmurhash3.js";
+
+describe("MurmurHash3_64", function () {
+  it("instantiates without seed", function () {
+    const hash = new MurmurHash3_64();
+    expect(hash).toEqual(jasmine.any(MurmurHash3_64));
+  });
+  it("instantiates with seed", function () {
+    const hash = new MurmurHash3_64(1);
+    expect(hash).toEqual(jasmine.any(MurmurHash3_64));
+  });
+
+  const hexDigestExpected = "f61cfdbfdae0f65e";
+  const sourceText = "test";
+  const sourceCharCodes = [116, 101, 115, 116]; // 't','e','s','t'
+  it("correctly generates a hash from a string", function () {
+    const hash = new MurmurHash3_64();
+    hash.update(sourceText);
+    expect(hash.hexdigest()).toEqual(hexDigestExpected);
+  });
+  it("correctly generates a hash from a Uint8Array", function () {
+    const hash = new MurmurHash3_64();
+    hash.update(new Uint8Array(sourceCharCodes));
+    expect(hash.hexdigest()).toEqual(hexDigestExpected);
+  });
+  it("correctly generates a hash from a Uint32Array", function () {
+    const hash = new MurmurHash3_64();
+    hash.update(new Uint32Array(new Uint8Array(sourceCharCodes).buffer));
+    expect(hash.hexdigest()).toEqual(hexDigestExpected);
+  });
+
+  it("changes the hash after update without seed", function () {
+    const hash = new MurmurHash3_64();
+    hash.update(sourceText);
+    const hexdigest1 = hash.hexdigest();
+    hash.update(sourceText);
+    const hexdigest2 = hash.hexdigest();
+    expect(hexdigest1).not.toEqual(hexdigest2);
+  });
+  it("changes the hash after update with seed", function () {
+    const hash = new MurmurHash3_64(1);
+    hash.update(sourceText);
+    const hexdigest1 = hash.hexdigest();
+    hash.update(sourceText);
+    const hexdigest2 = hash.hexdigest();
+    expect(hexdigest1).not.toEqual(hexdigest2);
+  });
+
+  it(
+    "generates correct hashes for TypedArrays which share the same " +
+      "underlying ArrayBuffer (issue 12533)",
+    function () {
+      // prettier-ignore
+      const typedArray = new Uint8Array([
+        0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1
+      ]);
+      const startArray = new Uint8Array(typedArray.buffer, 0, 10);
+      const endArray = new Uint8Array(typedArray.buffer, 10, 10);
+
+      expect(startArray).not.toEqual(endArray);
+
+      const startHash = new MurmurHash3_64();
+      startHash.update(startArray);
+      const startHexdigest = startHash.hexdigest();
+
+      const endHash = new MurmurHash3_64();
+      endHash.update(endArray);
+      const endHexdigest = endHash.hexdigest();
+
+      // The two hashes *must* be different.
+      expect(startHexdigest).not.toEqual(endHexdigest);
+
+      expect(startHexdigest).toEqual("a49de339cc5b0819");
+      expect(endHexdigest).toEqual("f81a92d9e214ab35");
+    }
+  );
+});