jasmine/spec/core/integration/CustomMatchersSpec.js

describe("Custom Matchers (Integration)", function () {
  var env;
  var fakeTimer;

  beforeEach(function () {
    env = new jasmineUnderTest.Env();
    env.configure({random: false});
  });

  it("allows adding more matchers local to a spec", function (done) {
    env.it('spec defining a custom matcher', function () {
      env.addMatchers({
        matcherForSpec: function () {
          return {
            compare: function (actual, expected) {
              return {pass: false, message: "matcherForSpec: actual: " + actual + "; expected: " + expected};
            }
          }
        }
      });

      env.expect("zzz").matcherForSpec("yyy");
    });

    env.it("spec without custom matcher defined", function() {
      expect(env.expect("zzz").matcherForSpec).toBeUndefined();
    });

    var specDoneSpy = jasmine.createSpy("specDoneSpy");
    var expectations = function() {
      var firstSpecResult = specDoneSpy.calls.first().args[0];
      expect(firstSpecResult.status).toEqual("failed");
      expect(firstSpecResult.failedExpectations[0].message).toEqual("matcherForSpec: actual: zzz; expected: yyy");
      done();
    };
    env.addReporter({ specDone:specDoneSpy, jasmineDone: expectations});

    env.execute();
  });

  it("passes the spec if the custom matcher passes", function(done) {
    env.it("spec using custom matcher", function() {
      env.addMatchers({
        toBeReal: function() {
          return { compare: function() { return { pass: true }; } };
        }
      });

      env.expect(true).toBeReal();
    });

    var specExpectations = function(result) {
      expect(result.status).toEqual('passed');
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  it("passes the spec if the custom equality matcher passes for types nested inside asymmetric equality testers", function(done) {
    env.it("spec using custom equality matcher", function() {
      var customEqualityFn = function(a, b) {
        // All "foo*" strings match each other.
        if (typeof a == "string" && typeof b == "string" &&
            a.substr(0, 3) == "foo" && b.substr(0, 3) == "foo") {
          return true;
        }
      };

      env.addCustomEqualityTester(customEqualityFn);
      env.expect({foo: 'fooValue'}).toEqual(jasmineUnderTest.objectContaining({foo: 'fooBar'}));
      env.expect(['fooValue', 'things']).toEqual(jasmineUnderTest.arrayContaining(['fooBar']));
      env.expect(['fooValue']).toEqual(jasmineUnderTest.arrayWithExactContents(['fooBar']));
    });

    var specExpectations = function(result) {
      expect(result.status).toEqual('passed');
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  it("supports asymmetric equality testers that take a list of custom equality testers", function(done) {
    // TODO: remove this in the next major release.
    spyOn(jasmineUnderTest, 'getEnv').and.returnValue(env);

    env.it("spec using custom asymmetric equality tester", function() {
      var customEqualityFn = function(a, b) {
        if (a === 2 && b === "two") {
          return true;
        }
      };
      var arrayWithFirstElement = function(sample) {
        return {
          asymmetricMatch: function (actual, customEqualityTesters) {
            return jasmineUnderTest.matchersUtil.equals(sample, actual[0], customEqualityTesters);
          }
        };
      };

      env.addCustomEqualityTester(customEqualityFn);
      env.expect(["two"]).toEqual(arrayWithFirstElement(2));
    });

    var specExpectations = function(result) {
      expect(result.status).toEqual('passed');
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  it("displays an appropriate failure message if a custom equality matcher fails", function(done) {
    env.it("spec using custom equality matcher", function() {
      var customEqualityFn = function(a, b) {
        // "foo" is not equal to anything
        if (a === 'foo' || b === 'foo') {
          return false;
        }
      };

      env.addCustomEqualityTester(customEqualityFn);
      env.expect({foo: 'foo'}).toEqual({foo: 'foo'});
    });

    var specExpectations = function(result) {
      expect(result.status).toEqual('failed');
      expect(result.failedExpectations[0].message).toEqual(
        "Expected $.foo = 'foo' to equal 'foo'."
      );
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  it("uses the negative compare function for a negative comparison, if provided", function(done) {
    env.it("spec with custom negative comparison matcher", function() {
      env.addMatchers({
        toBeReal: function() {
          return {
            compare: function() { return { pass: true }; },
            negativeCompare: function() { return { pass: true }; }
          };
        }
      });

      env.expect(true).not.toBeReal();
    });

    var specExpectations = function(result) {
      expect(result.status).toEqual('passed');
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  it("generates messages with the same rules as built in matchers absent a custom message", function(done) {
    env.it('spec with an expectation', function() {
      env.addMatchers({
        toBeReal: function() {
          return {
            compare: function() {
              return { pass: false };
            }
          }
        }
      });

      env.expect("a").toBeReal();
    });

    var specExpectations = function(result) {
      expect(result.failedExpectations[0].message).toEqual("Expected 'a' to be real.");
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  it("passes the expected and actual arguments to the comparison function", function(done) {
    var argumentSpy = jasmine.createSpy("argument spy").and.returnValue({ pass: true });

    env.it('spec with an expectation', function () {
      env.addMatchers({
        toBeReal: function() {
          return { compare: argumentSpy };
        }
      });

      env.expect(true).toBeReal();
      env.expect(true).toBeReal("arg");
      env.expect(true).toBeReal("arg1", "arg2");
    });

    var specExpectations = function() {
      expect(argumentSpy).toHaveBeenCalledWith(true);
      expect(argumentSpy).toHaveBeenCalledWith(true, "arg");
      expect(argumentSpy).toHaveBeenCalledWith(true, "arg1", "arg2");
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  // TODO: remove this in the next major release.
  it("passes the jasmine utility and current equality testers to the matcher factory", function(done) {
    var matcherFactory = function() { return { compare: function() { return {pass: true}; }}; },
        matcherFactorySpy = jasmine.createSpy("matcherFactorySpy").and.callFake(matcherFactory),
        customEqualityFn = function() { return true; };


    env.it("spec with expectation", function() {
      env.addCustomEqualityTester(customEqualityFn);
      env.addMatchers({
        toBeReal: matcherFactorySpy
      });

      env.expect(true).toBeReal();
    });

    var specExpectations = function() {
      expect(matcherFactorySpy).toHaveBeenCalledWith(
        jasmine.any(jasmineUnderTest.MatchersUtil),
        [customEqualityFn]
      );
    };

    env.addReporter({ specDone: specExpectations, jasmineDone: done });
    env.execute();
  });

  it("provides custom equality testers to the matcher factory via matchersUtil", function (done) {
    var matcherFactory = function (matchersUtil) {
        return {
          compare: function (actual, expected) {
            return {pass: matchersUtil.equals(actual[0], expected)};
          }
        };
      },
      customEqualityFn = jasmine.createSpy("customEqualityFn").and.callFake(function (a, b) {
        return a.toString() === b;
      });

    env.it("spec with expectation", function () {
      env.addCustomEqualityTester(customEqualityFn);
      env.addMatchers({
        toBeArrayWithFirstElement: matcherFactory
      });

      env.expect([1, 2]).toBeArrayWithFirstElement("1");
    });

    var specExpectations = function (result) {
      expect(customEqualityFn).toHaveBeenCalledWith(1, "1");
      expect(result.failedExpectations).toEqual([]);
    };

    env.addReporter({specDone: specExpectations, jasmineDone: done});
    env.execute();
  });
});