tests: add test cases for --ignore-warnings (#2294)

test/core-flags/ignore-warnings/ignore-warnings-flag.test.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const { run } = require('../../utils/test-utils');
+
+describe('ignore-warnings', () => {
+    it('should ignore the warning emitted', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['--ignore-warnings', /Generated Warning/]);
+
+        expect(exitCode).toBe(0);
+        expect(stderr).toBeFalsy();
+        expect(stdout).not.toContain('Module Warning (from ./my-warning-loader.js):');
+        expect(stdout).not.toContain('Generated Warning');
+    });
+
+    it('should reset options.ignoreWarnings', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['--ignore-warnings', /Generated Warning/, '--ignore-warnings-reset']);
+
+        expect(exitCode).toBe(0);
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('Module Warning (from ./my-warning-loader.js):');
+        expect(stdout).toContain('Generated Warning');
+    });
+
+    it('should throw error for an invalid value', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['--ignore-warnings', 'abc']);
+
+        expect(exitCode).toBe(2);
+        expect(stderr).toContain(`Invalid value 'abc' for the '--ignore-warnings' option`);
+        expect(stderr).toContain(`Expected: 'regular expression (example: /ab?c*/)'`);
+        expect(stdout).toBeFalsy();
+    });
+});

test/core-flags/ignore-warnings/my-warning-loader.js

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+module.exports = function loader(source) {
+    const { emitWarning } = this;
+    emitWarning('Generated Warning');
+    return source;
+};

test/core-flags/ignore-warnings/src/main.js

@@ -0,0 +1 @@
+console.log('Entry');

test/core-flags/ignore-warnings/webpack.config.js

@@ -0,0 +1,24 @@
+const path = require('path');
+
+module.exports = {
+    mode: 'development',
+    entry: './src/main.js',
+    module: {
+        rules: [
+            {
+                test: /.(js|jsx)?$/,
+                loader: 'my-warning-loader',
+                include: [path.resolve(__dirname, 'src')],
+                exclude: [/node_modules/],
+            },
+        ],
+    },
+    resolveLoader: {
+        alias: {
+            'my-warning-loader': require.resolve('./my-warning-loader'),
+        },
+    },
+    performance: {
+        hints: 'warning',
+    },
+};