stack-generator/spec/stack-generator-spec.js at master · stacktracejs/stack-generator · GitHub

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describe('StackGenerator', function() {
    describe('#backtrace', function() {
        afterEach(function () {
            window.onerror = null;
        });

        it('should generate backtrace for function declarations', function() {
            var stackFrames = null;

            function foo() {
                bar('arg1', 42);
            }

            function bar() {
                stackFrames = StackGenerator.backtrace();
            }

            foo();

            expect(stackFrames).toBeTruthy();
            expect(stackFrames[0].functionName).toBe('StackGenerator$$backtrace');
            expect(stackFrames[0].args).toEqual([]);
            expect(stackFrames[1].functionName).toBe('bar');
            expect(stackFrames[1].args).toEqual(['arg1', 42]);
            expect(stackFrames[2].functionName).toBe('foo');
            expect(stackFrames[2].args).toEqual([]);
        });

        it('should generate backtrace for named function expressions', function() {
            var stackFrames = null;
            var foo = function foo() {
                bar();
            };
            var bar = function bar() {
                stackFrames = StackGenerator.backtrace();
            };
            foo();

            expect(stackFrames).toBeTruthy();
            expect(stackFrames[0].functionName).toBe('StackGenerator$$backtrace');
            expect(stackFrames[0].args).toEqual([]);
            expect(stackFrames[1].functionName).toBe('bar');
            expect(stackFrames[1].args).toEqual([]);
            expect(stackFrames[2].functionName).toBe('foo');
            expect(stackFrames[2].args).toEqual([]);
        });

        it('should limit stack size given a max stack size', function() {
            var stackFrames = null;
            var foo = function foo() {
                bar();
            };
            var bar = function() {
                stackFrames = StackGenerator.backtrace({maxStackSize: 2});
            };
            foo();

            expect(stackFrames).toBeTruthy();
            expect(stackFrames.length).toBe(2);
        });

        it('should stop and not throw error when encountering a call to eval', function() {
            var stackFrames = null;
            var foo = function foo() {
                eval('stackFrames = StackGenerator.backtrace({maxStackSize: 2});');
            };
            foo();

            expect(stackFrames).toBeTruthy();
            expect(stackFrames[0].functionName).toBe('StackGenerator$$backtrace');
        });

        it('should stop and not throw error when entering a strict-mode context', function() {
            'use strict';

            function _isStrictMode() {
                return (eval('var __temp = null'), (typeof __temp === 'undefined'));
            }

            var stackFrames = null;
            var foo = function() {
                bar();
            };
            var bar = function bar() {
                stackFrames = StackGenerator.backtrace({maxStackSize: 25});
            };
            foo();

            expect(stackFrames).toBeTruthy();
            if (_isStrictMode()) {
                expect(stackFrames.length).toBe(1);
            }
            expect(stackFrames[0].functionName).toBe('StackGenerator$$backtrace');
        });

        it('should handle "null" callees', function(done) {
            var errored = false;
            window.onerror = function () {
                try {
                    StackGenerator.backtrace();
                } catch (e) {
                    errored = true;
                }
                expect(errored).toBe(false);
                done();
            };
            var script = document.createElement('script');
            script.src = '/base/spec/fixtures/a.js';
            window.document.body.appendChild(script);
        });
    });
});