messageFormatSpec.js

'use strict';

/* TODO: Add tests for:
 • Whitespace preservation in messages.
 • Whitespace ignored around syntax except for offset:N.
 • Escaping for curlies and the # symbol.
 • # symbol value.
 • # symbol value when gender is nested inside plural.
 • Error with nested # symbol.
 • parser error messages.
 • caching.
 • watched expressions.
 • test parsing AngularJS expressions
 • test the different regexes
 • test the different starting rules
*/

describe('$$ngMessageFormat', function() {
  describe('core', function() {
    var $$messageFormat, $parse, $interpolate, $locale, $rootScope;

    function Person(name, gender) {
      this.name = name;
      this.gender = gender;
    }

    var alice   = new Person('Alice', 'female'),
        bob     = new Person('Bob', 'male'),
        charlie = new Person('Charlie', 'male'),
        harry   = new Person('Harry Potter', 'male');

    function initScope($scope) {
      $scope.recipients = [alice, bob, charlie];
      $scope.sender = harry;
    }

    beforeEach(module('ngMessageFormat'));

    beforeEach(function() {
      inject(['$$messageFormat', '$parse', '$locale', '$interpolate', '$rootScope', function(
                 messageFormat,    parse,    locale,    interpolate,    rootScope) {
        $$messageFormat = messageFormat;
        $parse = parse;
        $interpolate = interpolate;
        $locale = locale;
        $rootScope = rootScope;
        initScope(rootScope);
      }]);
    });

    describe('mustache', function() {
      function assertMustache(text, expected) {
        var parsedFn = $interpolate(text);
        expect(parsedFn($rootScope)).toEqual(expected);
      }

      it('should suppress falsy objects', function() {
        assertMustache('{{undefined}}', '');
        assertMustache('{{null}}', '');
        assertMustache('{{a.b}}', '');
      });

      it('should jsonify objects', function() {
        assertMustache('{{ {} }}', '{}');
        assertMustache('{{ true }}', 'true');
        assertMustache('{{ false }}', 'false');
        assertMustache('{{ 1 }}', '1');
        assertMustache('{{ \'1\' }}', '1');
        assertMustache('{{ sender }}', '{"name":"Harry Potter","gender":"male"}');
      });

      it('should return function that can be called with no context', inject(function($interpolate) {
        expect($interpolate('{{sender.name}}')()).toEqual('');
      }));

      describe('watchable', function() {
        it('ckck', function() {
          var calls = [];
          $rootScope.$watch($interpolate('{{::name}}'), function(val) {
            calls.push(val);
          });

          $rootScope.$apply();
          expect(calls.length).toBe(1);

          $rootScope.name = 'foo';
          $rootScope.$apply();
          expect(calls.length).toBe(2);
          expect(calls[1]).toBe('foo');

          $rootScope.name = 'bar';
          $rootScope.$apply();
          expect(calls.length).toBe(2);
        });


        it('should stop watching strings with no expressions after first execution', function() {
          var spy = jasmine.createSpy();
          $rootScope.$watch($$messageFormat.interpolate('foo'), spy);
          $rootScope.$digest();
          expect($rootScope.$countWatchers()).toBe(0);
          expect(spy).toHaveBeenCalledWith('foo', 'foo', $rootScope);
          expect(spy).toHaveBeenCalledTimes(1);
        });

        it('should stop watching strings with only constant expressions after first execution', function() {
          var spy = jasmine.createSpy();
          $rootScope.$watch($$messageFormat.interpolate('foo {{42}}'), spy);
          $rootScope.$digest();
          expect($rootScope.$countWatchers()).toBe(0);
          expect(spy).toHaveBeenCalledWith('foo 42', 'foo 42', $rootScope);
          expect(spy).toHaveBeenCalledTimes(1);
        });


      });

      describe('plural', function() {
        it('no interpolation', function() {
          var text = '' +
            '{{recipients.length, plural,\n' +
            '    =0    {You gave no gifts}\n' +
            '    =1    {You gave one person a gift}\n' +
            // "=1" should override "one" for exact value.
            '    one   {YOU SHOULD NEVER SEE THIS MESSAGE}\n' +
            '    other {You gave some people gifts}\n' +
            '}}';
          var parsedFn = $interpolate(text, /*mustHaveExpression=*/true);
          expect(parsedFn.expressions.length).toBe(1);
          expect(parsedFn.expressions[0]).toEqual('recipients.length');

          $rootScope.recipients.length = 2;
          expect(parsedFn($rootScope)).toEqual('You gave some people gifts');

          $rootScope.recipients.length = 1;
          expect(parsedFn($rootScope)).toEqual('You gave one person a gift');

          $rootScope.recipients.length = 0;
          expect(parsedFn($rootScope)).toEqual('You gave no gifts');
        });

        it('with interpolation', function() {
          var text = '' +
            '{{recipients.length, plural,\n' +
            '    =0    {{{sender.name}} gave no gifts}\n' +
            '    =1    {{{sender.name}} gave one gift to {{recipients[0].name}}}\n' +
            // "=1" should override "one" for exact value.
            '    one   {YOU SHOULD NEVER SEE THIS MESSAGE}\n' +
            '    other {{{sender.name}} gave them a gift}\n' +
            '}}';
          var parsedFn = $interpolate(text, /*mustHaveExpression=*/true);
          expect(parsedFn.expressions.length).toBe(1);
          expect(parsedFn.expressions[0]).toEqual('recipients.length');

          $rootScope.recipients.length = 2;
          expect(parsedFn($rootScope)).toEqual('Harry Potter gave them a gift');

          $rootScope.recipients.length = 1;
          expect(parsedFn($rootScope)).toEqual('Harry Potter gave one gift to Alice');

          $rootScope.recipients.length = 0;
          expect(parsedFn($rootScope)).toEqual('Harry Potter gave no gifts');
        });

        it('with offset, interpolation, "#" symbol with and without escaping', function() {
          var text = '' +
            '{{recipients.length, plural, offset:1\n' +
            // NOTE: It's nonsensical to use "#" for "=0" with a positive offset.
            '    =0    {{{sender.name}} gave no gifts (\\#=#)}\n' +
            '    =1    {{{sender.name}} gave one gift to {{recipients[0].name}} (\\#=#)}\n' +
            '    one   {{{sender.name}} gave {{recipients[0].name}} and one other person a gift (\\#=#)}\n' +
            '    other {{{sender.name}} gave {{recipients[0].name}} and # other people a gift (\\#=#)}\n' +
            '}}';
          var parsedFn = $interpolate(text, /*mustHaveExpression=*/true);
          expect(parsedFn.expressions.length).toBe(1);
          expect(parsedFn.expressions[0]).toEqual('recipients.length');

          $rootScope.recipients.length = 3;
          // "#" should get replaced with the value of "recipients.length - offset"
          expect(parsedFn($rootScope)).toEqual('Harry Potter gave Alice and 2 other people a gift (#=2)');

          $rootScope.recipients.length = 2;
          expect(parsedFn($rootScope)).toEqual('Harry Potter gave Alice and one other person a gift (#=1)');

          $rootScope.recipients.length = 1;
          expect(parsedFn($rootScope)).toEqual('Harry Potter gave one gift to Alice (#=0)');

          $rootScope.recipients.length = 0;
          expect(parsedFn($rootScope)).toEqual('Harry Potter gave no gifts (#=-1)');
        });
      });

      it('nested plural and select', function() {
        var text = '' +
          '{{recipients.length, plural,\n' +
          '    =0 {You gave no gifts}\n' +
          '    =1 {{{recipients[0].gender, select,\n' +
          '            male {You gave him a gift. -{{sender.name}}}\n' +
          '            female {You gave her a gift. -{{sender.name}}}\n' +
          '            other {You gave them a gift. -{{sender.name}}}\n' +
          '        }}\n' +
          '       }\n' +
          '    other {You gave {{recipients.length}} people gifts. -{{sender.name}}}\n' +
          '}}';
        var parsedFn = $interpolate(text, /*mustHaveExpression=*/true);
        expect(parsedFn.expressions.length).toBe(1);
        expect(parsedFn.expressions[0]).toEqual('recipients.length');
        var result = parsedFn($rootScope);
        expect(result).toEqual('You gave 3 people gifts. -Harry Potter');
      });
    });

    describe('interpolate', function() {
      function assertInterpolation(text, expected) {
        var parsedFn = $$messageFormat.interpolate(text);
        expect(parsedFn($rootScope)).toEqual(expected);
      }

      it('should interpolate a plain string', function() {
        assertInterpolation(' Hello, world! ', ' Hello, world! ');
      });

      it('should interpolate a simple expression', function() {
        assertInterpolation('Hello, {{sender.name}}!', 'Hello, Harry Potter!');
      });
    });
  });


  /* NOTE: This describe block includes a copy of interpolateSpec.js to test that
   *       $$messageFormat.interpolate behaves the same as $interpolate.
   *       ONLY the following changes have been made.
   *       - Add beforeEach(module('ngMessageFormat')) at top level of describe()
   *       - Add extra "}" for it('should not unescape markers within expressions'). Original
   *         $interpolate has a bug/feature where a "}}" inside a string is also treated as a
   *         closing symbol.  The new service understands the string context and fixes this.
   *       - All tests for startSymbol/endSymbol have been commented out.  The new service does not
   *         allow you to change them as of now.
   *       - Instead, I've added tests to assert that we throw an exception if used with redefined
   *         startSymbol/endSymbol.  These tests are listed right in the beginning before the
   *         others.  allow you to change them as of now.
   */
  describe('$interpolate', function() {
    beforeEach(module('ngMessageFormat'));

    describe('startSymbol', function() {
      it('should expose the startSymbol in run phase', inject(function($interpolate) {
        expect($interpolate.startSymbol()).toBe('{{');
      }));
      describe('redefinition', function() {
        beforeEach(module(function($interpolateProvider) {
          expect($interpolateProvider.startSymbol()).toBe('{{');
          $interpolateProvider.startSymbol('((');
        }));
        it('should not work when the startSymbol is redefined', function() {
          expect(function() {
            inject(inject(function($interpolate) {}));
          }).toThrowMinErr('$interpolate', 'nochgmustache');
        });
      });
    });

    describe('endSymbol', function() {
      it('should expose the endSymbol in run phase', inject(function($interpolate) {
        expect($interpolate.endSymbol()).toBe('}}');
      }));
      describe('redefinition', function() {
        beforeEach(module(function($interpolateProvider) {
          expect($interpolateProvider.endSymbol()).toBe('}}');
          $interpolateProvider.endSymbol('))');
        }));
        it('should not work when the endSymbol is redefined', function() {
          expect(function() {
            inject(inject(function($interpolate) {}));
          }).toThrowMinErr('$interpolate', 'nochgmustache');
        });
      });
    });

    it('should return the interpolation object when there are no bindings and textOnly is undefined',
        inject(function($interpolate) {
      var interpolateFn = $interpolate('some text');

      expect(interpolateFn.exp).toBe('some text');
      expect(interpolateFn.expressions).toEqual([]);

      expect(interpolateFn({})).toBe('some text');
    }));


    it('should return undefined when there are no bindings and textOnly is set to true',
        inject(function($interpolate) {
      expect($interpolate('some text', true)).toBeUndefined();
    }));

    it('should return undefined when there are bindings and strict is set to true',
        inject(function($interpolate) {
      expect($interpolate('test {{foo}}', false, null, true)({})).toBeUndefined();
    }));

    it('should suppress falsy objects', inject(function($interpolate) {
      expect($interpolate('{{undefined}}')({})).toEqual('');
      expect($interpolate('{{null}}')({})).toEqual('');
      expect($interpolate('{{a.b}}')({})).toEqual('');
    }));

    it('should jsonify objects', inject(function($interpolate) {
      expect($interpolate('{{ {} }}')({})).toEqual('{}');
      expect($interpolate('{{ true }}')({})).toEqual('true');
      expect($interpolate('{{ false }}')({})).toEqual('false');
    }));


    it('should use custom toString when present', inject(function($interpolate, $rootScope) {
       var context = {
        a: {
          toString: function() {
            return 'foo';
          }
        }
      };

      expect($interpolate('{{ a }}')(context)).toEqual('foo');
    }));

    it('should NOT use toString on array objects', inject(function($interpolate) {
      expect($interpolate('{{a}}')({ a: [] })).toEqual('[]');
    }));


    it('should NOT use toString on Date objects', inject(function($interpolate) {
      var date = new Date(2014, 10, 10);
      expect($interpolate('{{a}}')({ a: date })).toBe(JSON.stringify(date));
      expect($interpolate('{{a}}')({ a: date })).not.toEqual(date.toString());
    }));


    it('should return interpolation function', inject(function($interpolate, $rootScope) {
      var interpolateFn = $interpolate('Hello {{name}}!');

      expect(interpolateFn.exp).toBe('Hello {{name}}!');
      expect(interpolateFn.expressions).toEqual(['name']);

      var scope = $rootScope.$new();
      scope.name = 'Bubu';

      expect(interpolateFn(scope)).toBe('Hello Bubu!');
    }));


    it('should ignore undefined model', inject(function($interpolate) {
      expect($interpolate('Hello {{\'World\'}}{{foo}}')({})).toBe('Hello World');
    }));


    it('should interpolate with undefined context', inject(function($interpolate) {
      expect($interpolate('Hello, world!{{bloop}}')()).toBe('Hello, world!');
    }));

    describe('watching', function() {
      it('should be watchable with any input types', inject(function($interpolate, $rootScope) {
        var lastVal;
        $rootScope.$watch($interpolate('{{i}}'), function(val) {
          lastVal = val;
        });
        $rootScope.$apply();
        expect(lastVal).toBe('');

        $rootScope.i = null;
        $rootScope.$apply();
        expect(lastVal).toBe('');

        $rootScope.i = '';
        $rootScope.$apply();
        expect(lastVal).toBe('');

        $rootScope.i = 0;
        $rootScope.$apply();
        expect(lastVal).toBe('0');

        $rootScope.i = [0];
        $rootScope.$apply();
        expect(lastVal).toBe('[0]');

        $rootScope.i = {a: 1, b: 2};
        $rootScope.$apply();
        expect(lastVal).toBe('{"a":1,"b":2}');
      }));

      it('should be watchable with literal values', inject(function($interpolate, $rootScope) {
        var lastVal;
        $rootScope.$watch($interpolate('{{1}}{{"2"}}{{true}}{{[false]}}{{ {a: 2} }}'), function(val) {
          lastVal = val;
        });
        $rootScope.$apply();
        expect(lastVal).toBe('12true[false]{"a":2}');

        expect($rootScope.$countWatchers()).toBe(0);
      }));

      it('should respect one-time bindings for each individual expression', inject(function($interpolate, $rootScope) {
        var calls = [];
        $rootScope.$watch($interpolate('{{::a | limitTo:1}} {{::s}} {{::i | number}}'), function(val) {
          calls.push(val);
        });

        $rootScope.$apply();
        expect(calls.length).toBe(1);

        $rootScope.a = [1];
        $rootScope.$apply();
        expect(calls.length).toBe(2);
        expect(calls[1]).toBe('[1]  ');

        $rootScope.a = [0];
        $rootScope.$apply();
        expect(calls.length).toBe(2);

        $rootScope.i = $rootScope.a = 123;
        $rootScope.s = 'str!';
        $rootScope.$apply();
        expect(calls.length).toBe(3);
        expect(calls[2]).toBe('[1] str! 123');

        expect($rootScope.$countWatchers()).toBe(0);
      }));

      it('should stop watching strings with no expressions after first execution',
        inject(function($interpolate, $rootScope) {
          var spy = jasmine.createSpy();
          $rootScope.$watch($interpolate('foo'), spy);
          $rootScope.$digest();
          expect($rootScope.$countWatchers()).toBe(0);
          expect(spy).toHaveBeenCalledWith('foo', 'foo', $rootScope);
          expect(spy).toHaveBeenCalledTimes(1);
        })
      );

      it('should stop watching strings with only constant expressions after first execution',
        inject(function($interpolate, $rootScope) {
          var spy = jasmine.createSpy();
          $rootScope.$watch($interpolate('foo {{42}}'), spy);
          $rootScope.$digest();
          expect($rootScope.$countWatchers()).toBe(0);
          expect(spy).toHaveBeenCalledWith('foo 42', 'foo 42', $rootScope);
          expect(spy).toHaveBeenCalledTimes(1);
        })
      );
    });

    describe('interpolation escaping', function() {
      var obj;
      beforeEach(function() {
        obj = {foo: 'Hello', bar: 'World'};
      });


      it('should support escaping interpolation signs', inject(function($interpolate) {
        expect($interpolate('{{foo}} \\{\\{bar\\}\\}')(obj)).toBe('Hello {{bar}}');
        expect($interpolate('\\{\\{foo\\}\\} {{bar}}')(obj)).toBe('{{foo}} World');
      }));


      it('should unescape multiple expressions', inject(function($interpolate) {
        expect($interpolate('\\{\\{foo\\}\\}\\{\\{bar\\}\\} {{foo}}')(obj)).toBe('{{foo}}{{bar}} Hello');
        expect($interpolate('{{foo}}\\{\\{foo\\}\\}\\{\\{bar\\}\\}')(obj)).toBe('Hello{{foo}}{{bar}}');
        expect($interpolate('\\{\\{foo\\}\\}{{foo}}\\{\\{bar\\}\\}')(obj)).toBe('{{foo}}Hello{{bar}}');
        expect($interpolate('{{foo}}\\{\\{foo\\}\\}{{bar}}\\{\\{bar\\}\\}{{foo}}')(obj)).toBe('Hello{{foo}}World{{bar}}Hello');
      }));


      /*
       *it('should support escaping custom interpolation start/end symbols', function() {
       *  module(function($interpolateProvider) {
       *    $interpolateProvider.startSymbol('[[');
       *    $interpolateProvider.endSymbol(']]');
       *  });
       *  inject(function($interpolate) {
       *    expect($interpolate('[[foo]] \\[\\[bar\\]\\]')(obj)).toBe('Hello [[bar]]');
       *  });
       *});
       */


      it('should unescape incomplete escaped expressions', inject(function($interpolate) {
        expect($interpolate('\\{\\{foo{{foo}}')(obj)).toBe('{{fooHello');
        expect($interpolate('\\}\\}foo{{foo}}')(obj)).toBe('}}fooHello');
        expect($interpolate('foo{{foo}}\\{\\{')(obj)).toBe('fooHello{{');
        expect($interpolate('foo{{foo}}\\}\\}')(obj)).toBe('fooHello}}');
      }));


      it('should not unescape markers within expressions', inject(function($interpolate) {
        expect($interpolate('{{"\\\\{\\\\{Hello, world!\\\\}\\\\}"}}')(obj)).toBe('\\{\\{Hello, world!\\}\\}');
        expect($interpolate('{{"\\{\\{Hello, world!\\}\\}"}}')(obj)).toBe('{{Hello, world!}}');
        expect(function() {
          $interpolate('{{\\{\\{foo\\}\\}}}')(obj);
        }).toThrowMinErr('$parse', 'lexerr',
          'Lexer Error: Unexpected next character  at columns 0-0 [\\] in expression [\\{\\{foo\\}\\}]');
      }));


      // This test demonstrates that the web-server is responsible for escaping every single instance
      // of interpolation start/end markers in an expression which they do not wish to evaluate,
      // because AngularJS will not protect them from being evaluated (due to the added complexity
      // and maintenance burden of context-sensitive escaping)
      it('should evaluate expressions between escaped start/end symbols', inject(function($interpolate) {
        expect($interpolate('\\{\\{Hello, {{bar}}!\\}\\}')(obj)).toBe('{{Hello, World!}}');
      }));
    });


    describe('interpolating in a trusted context', function() {
      var sce;
      beforeEach(function() {
        function log() {}
        var fakeLog = {log: log, warn: log, info: log, error: log};
        module(function($provide, $sceProvider) {
          $provide.value('$log', fakeLog);
          $sceProvider.enabled(true);
        });
        inject(['$sce', function($sce) { sce = $sce; }]);
      });

      it('should NOT interpolate non-trusted expressions', inject(function($interpolate, $rootScope) {
        var scope = $rootScope.$new();
        scope.foo = 'foo';

        expect(function() {
          $interpolate('{{foo}}', true, sce.CSS)(scope);
        }).toThrowMinErr('$interpolate', 'interr');
      }));

      it('should NOT interpolate mistyped expressions', inject(function($interpolate, $rootScope) {
        var scope = $rootScope.$new();
        scope.foo = sce.trustAsCss('foo');

        expect(function() {
          $interpolate('{{foo}}', true, sce.HTML)(scope);
        }).toThrowMinErr('$interpolate', 'interr');
      }));

      it('should interpolate trusted expressions in a regular context', inject(function($interpolate) {
        var foo = sce.trustAsCss('foo');
        expect($interpolate('{{foo}}', true)({foo: foo})).toBe('foo');
      }));

      it('should interpolate trusted expressions in a specific trustedContext', inject(function($interpolate) {
        var foo = sce.trustAsCss('foo');
        expect($interpolate('{{foo}}', true, sce.CSS)({foo: foo})).toBe('foo');
      }));

      // The concatenation of trusted values does not necessarily result in a trusted value.  (For
      // instance, you can construct evil JS code by putting together pieces of JS strings that are by
      // themselves safe to execute in isolation.)
      it('should NOT interpolate trusted expressions with multiple parts', inject(function($interpolate) {
        var foo = sce.trustAsCss('foo');
        var bar = sce.trustAsCss('bar');
        expect(function() {
          return $interpolate('{{foo}}{{bar}}', true, sce.CSS)({foo: foo, bar: bar});
        }).toThrowMinErr(
                  '$interpolate', 'noconcat', 'Error while interpolating: {{foo}}{{bar}}\n' +
                  'Strict Contextual Escaping disallows interpolations that concatenate multiple ' +
                  'expressions when a trusted value is required.  See ' +
                  'http://docs.angularjs.org/api/ng.$sce');
      }));
    });


/*
 *    describe('provider', function() {
 *      beforeEach(module(function($interpolateProvider) {
 *        $interpolateProvider.startSymbol('--');
 *        $interpolateProvider.endSymbol('--');
 *      }));
 *
 *      it('should not get confused with same markers', inject(function($interpolate) {
 *        expect($interpolate('---').expressions).toEqual([]);
 *        expect($interpolate('----')({})).toEqual('');
 *        expect($interpolate('--1--')({})).toEqual('1');
 *      }));
 *    });
 */

    describe('parseBindings', function() {
      it('should Parse Text With No Bindings', inject(function($interpolate) {
        expect($interpolate('a').expressions).toEqual([]);
      }));

      it('should Parse Empty Text', inject(function($interpolate) {
        expect($interpolate('').expressions).toEqual([]);
      }));

      it('should Parse Inner Binding', inject(function($interpolate) {
        var interpolateFn = $interpolate('a{{b}}C'),
            expressions = interpolateFn.expressions;
        expect(expressions).toEqual(['b']);
        expect(interpolateFn({b: 123})).toEqual('a123C');
      }));

      it('should Parse Ending Binding', inject(function($interpolate) {
        var interpolateFn = $interpolate('a{{b}}'),
          expressions = interpolateFn.expressions;
        expect(expressions).toEqual(['b']);
        expect(interpolateFn({b: 123})).toEqual('a123');
      }));

      it('should Parse Begging Binding', inject(function($interpolate) {
        var interpolateFn = $interpolate('{{b}}c'),
          expressions = interpolateFn.expressions;
        expect(expressions).toEqual(['b']);
        expect(interpolateFn({b: 123})).toEqual('123c');
      }));

      it('should Parse Loan Binding', inject(function($interpolate) {
        var interpolateFn = $interpolate('{{b}}'),
          expressions = interpolateFn.expressions;
        expect(expressions).toEqual(['b']);
        expect(interpolateFn({b: 123})).toEqual('123');
      }));

      it('should Parse Two Bindings', inject(function($interpolate) {
        var interpolateFn = $interpolate('{{b}}{{c}}'),
          expressions = interpolateFn.expressions;
        expect(expressions).toEqual(['b', 'c']);
        expect(interpolateFn({b: 111, c: 222})).toEqual('111222');
      }));

      it('should Parse Two Bindings With Text In Middle', inject(function($interpolate) {
        var interpolateFn = $interpolate('{{b}}x{{c}}'),
          expressions = interpolateFn.expressions;
        expect(expressions).toEqual(['b', 'c']);
        expect(interpolateFn({b: 111, c: 222})).toEqual('111x222');
      }));

      it('should Parse Multiline', inject(function($interpolate) {
        var interpolateFn = $interpolate('"X\nY{{A\n+B}}C\nD"'),
          expressions = interpolateFn.expressions;
        expect(expressions).toEqual(['A\n+B']);
        expect(interpolateFn({'A': 'aa', 'B': 'bb'})).toEqual('"X\nYaabbC\nD"');
      }));
    });


    describe('isTrustedContext', function() {
      it('should NOT interpolate a multi-part expression when isTrustedContext is true', inject(function($interpolate) {
        var isTrustedContext = true;
        expect(function() {
            $interpolate('constant/{{var}}', true, isTrustedContext);
          }).toThrowMinErr(
              '$interpolate', 'noconcat', 'Error while interpolating: constant/{{var}}\nStrict ' +
              'Contextual Escaping disallows interpolations that concatenate multiple expressions ' +
              'when a trusted value is required.  See http://docs.angularjs.org/api/ng.$sce');
        expect(function() {
          $interpolate('{{var}}/constant', true, isTrustedContext);
        }).toThrowMinErr(
            '$interpolate', 'noconcat', 'Error while interpolating: {{var}}/constant\nStrict ' +
              'Contextual Escaping disallows interpolations that concatenate multiple expressions ' +
              'when a trusted value is required.  See http://docs.angularjs.org/api/ng.$sce');
        expect(function() {
            $interpolate('{{foo}}{{bar}}', true, isTrustedContext);
          }).toThrowMinErr(
              '$interpolate', 'noconcat', 'Error while interpolating: {{foo}}{{bar}}\nStrict ' +
              'Contextual Escaping disallows interpolations that concatenate multiple expressions ' +
              'when a trusted value is required.  See http://docs.angularjs.org/api/ng.$sce');
      }));

      it('should interpolate a multi-part expression when isTrustedContext is false', inject(function($interpolate) {
        expect($interpolate('some/{{id}}')({})).toEqual('some/');
        expect($interpolate('some/{{id}}')({id: 1})).toEqual('some/1');
        expect($interpolate('{{foo}}{{bar}}')({foo: 1, bar: 2})).toEqual('12');
      }));
    });

/*
 *    describe('startSymbol', function() {
 *
 *      beforeEach(module(function($interpolateProvider) {
 *        expect($interpolateProvider.startSymbol()).toBe('{{');
 *        $interpolateProvider.startSymbol('((');
 *      }));
 *
 *
 *      it('should expose the startSymbol in config phase', module(function($interpolateProvider) {
 *        expect($interpolateProvider.startSymbol()).toBe('((');
 *      }));
 *
 *
 *      it('should expose the startSymbol in run phase', inject(function($interpolate) {
 *        expect($interpolate.startSymbol()).toBe('((');
 *      }));
 *
 *
 *      it('should not get confused by matching start and end symbols', function() {
 *        module(function($interpolateProvider) {
 *          $interpolateProvider.startSymbol('--');
 *          $interpolateProvider.endSymbol('--');
 *        });
 *
 *        inject(function($interpolate) {
 *          expect($interpolate('---').expressions).toEqual([]);
 *          expect($interpolate('----')({})).toEqual('');
 *          expect($interpolate('--1--')({})).toEqual('1');
 *        });
 *      });
 *    });
 */


/*
 *    describe('endSymbol', function() {
 *
 *      beforeEach(module(function($interpolateProvider) {
 *        expect($interpolateProvider.endSymbol()).toBe('}}');
 *        $interpolateProvider.endSymbol('))');
 *      }));
 *
 *
 *      it('should expose the endSymbol in config phase', module(function($interpolateProvider) {
 *        expect($interpolateProvider.endSymbol()).toBe('))');
 *      }));
 *
 *
 *      it('should expose the endSymbol in run phase', inject(function($interpolate) {
 *        expect($interpolate.endSymbol()).toBe('))');
 *      }));
 *    });
 */

  });  // end of tests copied from $interpolate
});