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A small sample of a Jasmine custom matcher that internally parses expressions into an AST.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> | |
| <title>Custom matchers for Expressions</title> | |
| <!-- $ bower install jasmine && npm install jsep --> | |
| <link href="bower_components/jasmine/lib/jasmine-core/jasmine.css" rel="stylesheet" /> | |
| <script src="bower_components/jasmine/lib/jasmine-core/jasmine.js"></script> | |
| <script src="bower_components/jasmine/lib/jasmine-core/jasmine-html.js"></script> | |
| <script src="bower_components/jasmine/lib/jasmine-core/boot.js"></script> | |
| <script src="node_modules/jsep/src/jsep.js"></script> | |
| <script src="tests.js"></script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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| var toHaveBeenCalledWithExpression = { | |
| toHaveBeenCalledWithExpression: function () { | |
| return { | |
| compare: function () { | |
| var createAbstractSyntaxTree = function (expression) { | |
| return jsep(expression); | |
| }; | |
| var binaryOperators = { | |
| ">": function (a, b) { | |
| return a > b; | |
| }, | |
| "<": function (a, b) { | |
| return a < b; | |
| }, | |
| "==": function (a, b) { | |
| return a == b; | |
| }, | |
| "===": function (a, b) { | |
| return a === b; | |
| }, | |
| "<=": function (a, b) { | |
| return a <= b; | |
| }, | |
| ">=": function (a, b) { | |
| return a >= b; | |
| }, | |
| "!=": function (a, b) { | |
| return a != b; | |
| }, | |
| "!==": function (a, b) { | |
| return a !== b; | |
| } | |
| }; | |
| var verify = function (type, operator, left, right) { | |
| if (type === "BinaryExpression") { | |
| return binaryOperators[operator](left, right); | |
| } | |
| }; | |
| var expression = arguments[1]; | |
| var leftComponent = arguments[0].calls.allArgs()[0][0]; | |
| var ast = createAbstractSyntaxTree(expression); | |
| var result = verify(ast.type, ast.operator, leftComponent, ast.right.value); | |
| return { pass: result }; | |
| } | |
| }; | |
| } | |
| }; | |
| describe('expectations via expressions parsed into an AST', function () { | |
| beforeEach(function () { | |
| jasmine.addMatchers(toHaveBeenCalledWithExpression); | |
| }); | |
| [{ | |
| actual: 1, | |
| expression: 'x > 0' | |
| }, { | |
| actual: 2, | |
| expression: 'x < 3' | |
| }, { | |
| actual: 3, | |
| expression: 'x == 3' | |
| }, { | |
| actual: 4, | |
| expression: 'x === 4' | |
| }, { | |
| actual: 5, | |
| expression: 'x <= 5' | |
| }, { | |
| actual: 6, | |
| expression: 'x >= 6' | |
| }, { | |
| actual: 7, | |
| expression: 'x != 8' | |
| }, { | |
| actual: 8, | |
| expression: 'x !== 9' | |
| }, { | |
| actual: 1, | |
| expression: 'y > 0' | |
| }, { | |
| actual: 2, | |
| expression: 'y < 3' | |
| }, { | |
| actual: 3, | |
| expression: 'y == 3' | |
| }, { | |
| actual: 4, | |
| expression: 'y === 4' | |
| }, { | |
| actual: 5, | |
| expression: 'y <= 5' | |
| }, { | |
| actual: 6, | |
| expression: 'y >= 6' | |
| }, { | |
| actual: 7, | |
| expression: 'y != 8' | |
| }, { | |
| actual: 8, | |
| expression: 'y !== 9' | |
| }, { | |
| actual: 1, | |
| expression: '_ > 0' | |
| }, { | |
| actual: 2, | |
| expression: '_ < 3' | |
| }, { | |
| actual: 3, | |
| expression: '_ == 3' | |
| }, { | |
| actual: 4, | |
| expression: '_ === 4' | |
| }, { | |
| actual: 5, | |
| expression: '_ <= 5' | |
| }, { | |
| actual: 6, | |
| expression: '_ >= 6' | |
| }, { | |
| actual: 7, | |
| expression: '_ != 8' | |
| }, { | |
| actual: 8, | |
| expression: '_ !== 9' | |
| }].forEach(function(testCase) { | |
| var actual = testCase.actual; | |
| var expression = testCase.expression; | |
| it(actual + ' has been called with ' + expression, function() { | |
| var sut = {}; | |
| sut.foo = function(arg) {}; | |
| spyOn(sut, 'foo'); | |
| sut.foo(actual); | |
| expect(sut.foo).toHaveBeenCalledWithExpression(expression); | |
| }); | |
| }); | |
| }); |
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