Tags and tests

test/uniqueElementsBy/uniqueElementsBy.test.js

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+const expect = require('expect');
+const uniqueElementsBy = require('./uniqueElementsBy.js');
+
+test('uniqueElementsBy is a Function', () => {
+  expect(uniqueElementsBy).toBeInstanceOf(Function);
+});
+
+test('uniqueElementsBy works for properties', () => {
+  expect(uniqueElementsBy(
+  	[
+  		{ id: 0, value: 'a' },
+  		{ id: 1, value: 'b' },
+  		{ id: 2, value: 'c' },
+  		{ id: 1, value: 'd' },
+  		{ id: 0, value: 'e' },
+  	],
+  	(a, b) => a.id == b.id
+  )).toEqual([ { id: 0, value: 'a' }, { id: 1, value: 'b' }, { id: 2, value: 'c' } ]);
+});
+
+test('uniqueElementsBy works for nested properties', () => {
+  expect(uniqueElementsBy(
+  	[
+  		{ id: 0, value: 'a', n: {p: 0} },
+  		{ id: 1, value: 'b', n: {p: 1} },
+  		{ id: 2, value: 'c', n: {p: 2} },
+  		{ id: 1, value: 'd', n: {p: 0} },
+  		{ id: 0, value: 'e', n: {p: 1} },
+  	],
+  	(a, b) => a.id == b.id
+  )).toEqual([ { id: 0, value: 'a', n: {p: 0} }, { id: 1, value: 'b', n: {p: 1} }, { id: 2, value: 'c', n: {p: 2} } ]);
+});