assertEqual

gistfile1.js

assertEqual: function(actual, expected) {
                // Uses TraceKit to get stacktrace of caller,
                // it looks for the line number of the first anonymous eval
                // Stack traces are pretty nasty and not standardized yet
                // so this is not as elegant as one might hope.
                // Safari doesn't even give line numbers for anonymous evals,
                // so they can go sit in the dunce corner today.
                // This returns 0 if not found, which will mean that all
                // the assertion failures are shown on the first line.
                var getLineNum = function(stacktrace) {
                    var err = new Error();
                    TraceKit.remoteFetching = false;
                    TraceKit.collectWindowErrors = false;
                    var stacktrace = TraceKit.computeStackTrace.ofCaller();
                    var lines = stacktrace.stack;
                    for (var i = 0; i < lines.length; i++) {
                        if (lines[i].func === "Object.apply.get.message") {
                            // Chrome
                            return lines[i].line - 5;
                        } else if (lines[i].func === "anonymous/<") {
                            // Firefox
                            return lines[i].line - 4;
                        }
                    }
                    return -1;
                };

                if (_.isEqual(actual, expected)) {
                    return;
                }

                var msg = $._("Assertion failed: " +
                    "%(actual)s is not equal to %(expected)s.", {
                        actual: JSON.stringify(actual),
                        expected: JSON.stringify(expected)
                });

                var lineNum = getLineNum();
                // Display on first line if we didn't find a line #
                if (lineNum < 0) {
                    lineNum = 0;
                }

                this.output.assertions.push({
                    row: lineNum, column: 0, text: msg
                });
            },