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

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

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

test/binCases/config-location/webpack-ts-config/tsconfig.json

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+{
+  "compilerOptions": {
+    "esModuleInterop": true
+  }
+}

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

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+"use strict";
+
+const { run } = require("../../../testUtils");
+
+test("webpack-ts-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-ts-config/webpack.config.ts

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+import path from "path";
+import webpack from "webpack";
+
+const config: webpack.Configuration = {
+	entry: path.resolve(__dirname, "./index2"),
+};
+
+export default config;