add testcase for moving entry modules into the commons chunk

#4795

test/configCases/commons-chunk-plugin/move-entry/a.js

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

test/configCases/commons-chunk-plugin/move-entry/index.js

@@ -0,0 +1,5 @@
+require("should");
+
+it("should not be moved", function() {
+	new Error().stack.should.not.match(/webpackBootstrap/);
+});

test/configCases/commons-chunk-plugin/move-entry/test.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+	findBundle: function(i, options) {
+		return [
+			"./commons.js",
+			"./main.js"
+		]
+	}
+};

test/configCases/commons-chunk-plugin/move-entry/webpack.config.js

@@ -0,0 +1,16 @@
+var CommonsChunkPlugin = require("../../../../lib/optimize/CommonsChunkPlugin");
+module.exports = {
+	entry: {
+		main: "./index",
+		second: "./index"
+	},
+	target: "web",
+	output: {
+		filename: "[name].js"
+	},
+	plugins: [
+		new CommonsChunkPlugin({
+			name: "commons"
+		})
+	]
+};