Failing tests if there are any un-asserted warnings or deprecations

Author: weaverryan

lib/logger.js

@@ -69,8 +69,18 @@ module.exports = {
         log(`${chalk.bgYellow.black('DEPRECATION')} ${chalk.yellow(message)}`);
     },
 
-    getMessages() {
-        return messages;
+    /**
+     * @returns {Array}
+     */
+    getDeprecations() {
+        return messages.deprecation;
+    },
+
+    /**
+     * @returns {Array}
+     */
+    getWarnings() {
+        return messages.warning;
     },
 
     quiet(setQuiet = true) {

test/_unsilencedLogsCheck.js

@@ -0,0 +1,28 @@
+/*
+ * This file is part of the Symfony Webpack Encore package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+'use strict';
+
+const logger = require('../lib/logger');
+
+beforeEach(function() {
+    logger.quiet();
+});
+
+afterEach(function() {
+    if (logger.getDeprecations().length > 0) {
+        this.test.error(new Error(`There were ${logger.getWarnings().length} unexpected deprecation log messages: \n${logger.getDeprecations().join('\n')}`));
+    }
+
+    if (logger.getWarnings().length > 0) {
+        this.test.error(new Error(`There were ${logger.getWarnings().length} unexpected warning log messages: \n${logger.getWarnings().join('\n')}`));
+    }
+
+    logger.reset();
+});

test/helpers/logger-assert.js

@@ -0,0 +1,44 @@
+/*
+ * This file is part of the Symfony Webpack Encore package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+'use strict';
+
+const logger = require('../../lib/logger');
+
+function assertWarning(expectedMessage) {
+    assertLogMessage(logger.getWarnings(), 'warning', expectedMessage);
+}
+
+function assertDeprecation(expectedMessage) {
+    assertLogMessage(logger.getDeprecations(), 'deprecation', expectedMessage);
+}
+
+function assertLogMessage(messages, description, expectedMessage) {
+    if (messages.length === 0) {
+        throw new Error(`Found zero log ${description}s. And so, expected ${description} ${expectedMessage} was not logged.`);
+    }
+
+    let isFound = false;
+    messages.forEach(function(message, index) {
+        if (!isFound && message.includes(expectedMessage)) {
+            isFound = true;
+            // remove from the array now that it is found
+            messages.splice(index, 1);
+        }
+    });
+
+    if (!isFound) {
+        throw new Error(`Did not find any log ${description}s matching ${expectedMessage}. Found: ${messages.join('\n')}`);
+    }
+}
+
+module.exports = {
+    assertWarning,
+    assertDeprecation
+};