added more content

node_modules/match-at/lib/__tests__/matchAt-test.js

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+describe('matchAt', function () {
+
+  var matchAt;
+
+  beforeEach(function () {
+    matchAt = require('../matchAt.js');
+  });
+
+  it('matches a simple regex', function () {
+    expect(matchAt(/l/, 'hello', 0)).toBe(null);
+    expect(matchAt(/l/, 'hello', 1)).toBe(null);
+    expect(matchAt(/l/, 'hello', 4)).toBe(null);
+    expect(matchAt(/l/, 'hello', 5)).toBe(null);
+
+    var match = matchAt(/l/, 'hello', 2);
+    expect(Array.isArray(match)).toBe(true);
+    expect(match.index).toBe(2);
+    expect(match.input).toBe('hello');
+    expect(match[0]).toBe('l');
+    expect(match[1]).toBe(undefined);
+    expect(match.length).toBe(1);
+
+    var match = matchAt(/l/, 'hello', 3);
+    expect(Array.isArray(match)).toBe(true);
+    expect(match.index).toBe(3);
+    expect(match.input).toBe('hello');
+    expect(match[0]).toBe('l');
+    expect(match[1]).toBe(undefined);
+    expect(match.length).toBe(1);
+  });
+
+  it('matches a zero-length regex', function () {
+    expect(matchAt(/(?=l)/, 'hello', 0)).toBe(null);
+    expect(matchAt(/(?=l)/, 'hello', 1)).toBe(null);
+    expect(matchAt(/(?=l)/, 'hello', 4)).toBe(null);
+    expect(matchAt(/(?=l)/, 'hello', 5)).toBe(null);
+
+    var match = matchAt(/(?=l)/, 'hello', 2);
+    expect(Array.isArray(match)).toBe(true);
+    expect(match.index).toBe(2);
+    expect(match.input).toBe('hello');
+    expect(match[0]).toBe('');
+    expect(match[1]).toBe(undefined);
+    expect(match.length).toBe(1);
+
+    var match = matchAt(/(?=l)/, 'hello', 3);
+    expect(Array.isArray(match)).toBe(true);
+    expect(match.index).toBe(3);
+    expect(match.input).toBe('hello');
+    expect(match[0]).toBe('');
+    expect(match[1]).toBe(undefined);
+    expect(match.length).toBe(1);
+  });
+
+  it('matches a regex with capturing groups', function () {
+    expect(matchAt(/(l)(l)?/, 'hello', 0)).toBe(null);
+    expect(matchAt(/(l)(l)?/, 'hello', 1)).toBe(null);
+    expect(matchAt(/(l)(l)?/, 'hello', 4)).toBe(null);
+    expect(matchAt(/(l)(l)?/, 'hello', 5)).toBe(null);
+
+    var match = matchAt(/(l)(l)?/, 'hello', 2);
+    expect(Array.isArray(match)).toBe(true);
+    expect(match.index).toBe(2);
+    expect(match.input).toBe('hello');
+    expect(match[0]).toBe('ll');
+    expect(match[1]).toBe('l');
+    expect(match[2]).toBe('l');
+    expect(match.length).toBe(3);
+
+    var match = matchAt(/(l)(l)?/, 'hello', 3);
+    expect(Array.isArray(match)).toBe(true);
+    expect(match.index).toBe(3);
+    expect(match.input).toBe('hello');
+    expect(match[0]).toBe('l');
+    expect(match[1]).toBe('l');
+    expect(match[2]).toBe(undefined);
+    expect(match.length).toBe(3);
+  });
+
+  it('copies flags over', function () {
+    expect(matchAt(/L/i, 'hello', 0)).toBe(null);
+    expect(matchAt(/L/i, 'hello', 1)).toBe(null);
+    expect(matchAt(/L/i, 'hello', 2)).not.toBe(null);
+    expect(matchAt(/L/i, 'hello', 3)).not.toBe(null);
+    expect(matchAt(/L/i, 'hello', 4)).toBe(null);
+    expect(matchAt(/L/i, 'hello', 5)).toBe(null);
+  });
+});