tests: relative configs (#1927)

test/config-lookup/relative/a.js

@@ -0,0 +1 @@
+module.exports = 'a.js';

test/config-lookup/relative/basic-config.test.js

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+'use strict';
+const { existsSync } = require('fs');
+const { resolve } = require('path');
+const { run } = require('../../utils/test-utils');
+
+describe('relative path to config', () => {
+    it('should work', () => {
+        const { stdout, stderr, exitCode } = run(__dirname, ['-c', 'webpack.config.js', '--output-path', './binary/a'], false);
+        expect(stderr).toBeFalsy();
+        expect(stdout).toBeTruthy();
+        expect(exitCode).toBe(0);
+        expect(existsSync(resolve(__dirname, './binary/a/a.bundle.js'))).toBeTruthy();
+    });
+
+    it('should work #2', () => {
+        const { stdout, stderr, exitCode } = run(__dirname, ['-c', './webpack.config.js', '--output-path', './binary/b'], false);
+        expect(stderr).toBeFalsy();
+        expect(stdout).toBeTruthy();
+        expect(exitCode).toBe(0);
+        expect(existsSync(resolve(__dirname, './binary/b/a.bundle.js'))).toBeTruthy();
+    });
+});

test/config-lookup/relative/webpack.config.js

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+const { resolve } = require('path');
+
+module.exports = {
+    entry: './a.js',
+    output: {
+        path: resolve(__dirname, 'binary'),
+        filename: 'a.bundle.js',
+    },
+};