Add tests for hash calculator

Author: configurator

test/Documents/Queries/HashCalculatorTest.ts

@@ -0,0 +1,46 @@
+import * as assert from "assert";
+
+import { HashCalculator } from "../../../src/Documents/Queries/HashCalculator";
+import { TypesAwareObjectMapper } from "../../../src/Mapping/ObjectMapper";
+
+const mockObjectMapper = {
+    toObjectLiteral: obj => obj.toString()
+} as TypesAwareObjectMapper;
+
+const hash = data => {
+    const calculator = new HashCalculator();
+    calculator.write(data, mockObjectMapper);
+    return calculator.getHash();
+}
+
+describe('Hash calculator tests', () => {
+    it('Calculates the same hash for the same object', async () => {
+        const obj = {
+            boolean: true,
+            function: () => {
+                console.log('No-op')
+            },
+            number: 4,
+            object: {
+                property: 'value'
+            },
+            string: 'hello',
+            symbol: Symbol('world'),
+            undefined: undefined,
+        };
+
+        assert.equal(hash(obj), hash(obj));
+        assert.equal(hash(obj), hash({ ...obj }));
+    });
+
+    it('Calculates different hashes for different types', async () => {
+        assert.notEqual(hash(1), hash(true))
+        assert.notEqual(hash('1'), hash(true))
+        assert.notEqual(hash(1), hash('1'))
+    });
+
+    it('Calculates different hashes for different numbers', async () => {
+        assert.notEqual(hash(1), hash(257));
+        assert.notEqual(hash(86400), hash(0));
+    });
+});