testing-utils.js

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
    result["default"] = mod;
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
const sinon_1 = __importDefault(require("sinon"));
const CodeQL = __importStar(require("./codeql"));
function wrapOutput(context) {
    // Function signature taken from Socket.write.
    // Note there are two overloads:
    // write(buffer: Uint8Array | string, cb?: (err?: Error) => void): boolean;
    // write(str: Uint8Array | string, encoding?: string, cb?: (err?: Error) => void): boolean;
    return (chunk, encoding, cb) => {
        // Work out which method overload we are in
        if (cb === undefined && typeof encoding === "function") {
            cb = encoding;
            encoding = undefined;
        }
        // Record the output
        if (typeof chunk === "string") {
            context.testOutput += chunk;
        }
        else {
            context.testOutput += new TextDecoder(encoding || "utf-8").decode(chunk);
        }
        // Satisfy contract by calling callback when done
        if (cb !== undefined && typeof cb === "function") {
            cb();
        }
        return true;
    };
}
function setupTests(test) {
    const typedTest = test;
    typedTest.beforeEach((t) => {
        // Set an empty CodeQL object so that all method calls will fail
        // unless the test explicitly sets one up.
        CodeQL.setCodeQL({});
        // Replace stdout and stderr so we can record output during tests
        t.context.testOutput = "";
        const processStdoutWrite = process.stdout.write.bind(process.stdout);
        t.context.stdoutWrite = processStdoutWrite;
        process.stdout.write = wrapOutput(t.context);
        const processStderrWrite = process.stderr.write.bind(process.stderr);
        t.context.stderrWrite = processStderrWrite;
        process.stderr.write = wrapOutput(t.context);
        // Many tests modify environment variables. Take a copy now so that
        // we reset them after the test to keep tests independent of each other.
        // process.env only has strings fields, so a shallow copy is fine.
        t.context.env = {};
        Object.assign(t.context.env, process.env);
    });
    typedTest.afterEach.always((t) => {
        // Restore stdout and stderr
        // The captured output is only replayed if the test failed
        process.stdout.write = t.context.stdoutWrite;
        process.stderr.write = t.context.stderrWrite;
        if (!t.passed) {
            process.stdout.write(t.context.testOutput);
        }
        // Undo any modifications made by sinon
        sinon_1.default.restore();
        // Undo any modifications to the env
        process.env = t.context.env;
    });
}
exports.setupTests = setupTests;
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