tests(bin): add webpack.config.babel.js related test (webpack#724)

test/binCases/config-location/webpack-babel-config/index2.js

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+module.exports = "webpack-babel-config";

test/binCases/config-location/webpack-babel-config/webpack-babel-config.test.js

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+"use strict";
+
+const { run } = require("../../../testUtils");
+
+test("webpack-babel-config", () => {
+	const { code, stdout, stderr } = run(__dirname, [
+		"--output-filename",
+		"[name].js",
+		"--output-chunk-filename",
+		"[id].chunk.js",
+		"--target",
+		"async-node",
+	]);
+	expect(code).toBe(0);
+	expect(stdout).toContain("./index2.js");
+	expect(stderr).toHaveLength(0);
+});

test/binCases/config-location/webpack-babel-config/webpack.config.babel.js

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+// eslint-disable-next-line node/no-unsupported-features, node/no-unsupported-features/es-syntax
+import path from "path";
+
+const config = {
+	entry: path.resolve(__dirname, "./index2")
+};
+
+// eslint-disable-next-line node/no-unsupported-features, node/no-unsupported-features/es-syntax
+export default config;