test: @charset (#823)

Author: alexander-akait

test/cases/at-charset/a.css

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+@charset "utf-8";
+
+@import "./ae.css";
+@import "./aa.css";
+@import "./ab.css";
+@import "./ac.css";
+@import "./ad.css";
+
+body {
+  background: red;
+}

test/cases/at-charset/aa.css

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+@charset "utf-8";
+
+.aa {
+  background: green;
+}

test/cases/at-charset/ab.css

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+@charset "utf-8";
+
+.ab {
+  background: green;
+}

test/cases/at-charset/ac.css

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+@charset "utf-8";
+
+.ac {
+  background: green;
+}

test/cases/at-charset/ad.css

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+@charset "utf-8";
+
+.ad {
+  background: green;
+}

test/cases/at-charset/ae.css

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+@charset "utf-8";
+
+.ae {
+  background: green;
+}

test/cases/at-charset/b.css

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+@charset "utf-8";
+
+@import "./ba.css";
+@import "./bb.css";
+
+body {
+  background: yellow;
+}

test/cases/at-charset/ba.css

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+@charset "utf-8";
+
+.ba {
+  background: green;
+}

test/cases/at-charset/bb.css

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+@charset "utf-8";
+
+.bb {
+  background: green;
+}

test/cases/at-charset/expected/main.css

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+@charset "utf-8";
+
+.ae {
+  background: green;
+}
+
+@charset "utf-8";
+
+.aa {
+  background: green;
+}
+
+@charset "utf-8";
+
+.ab {
+  background: green;
+}
+
+@charset "utf-8";
+
+.ac {
+  background: green;
+}
+
+@charset "utf-8";
+
+.ad {
+  background: green;
+}
+
+@charset "utf-8";
+
+body {
+  background: red;
+}
+
+@charset "utf-8";
+
+.ba {
+  background: green;
+}
+
+@charset "utf-8";
+
+.bb {
+  background: green;
+}
+
+@charset "utf-8";
+
+body {
+  background: yellow;
+}
+

test/cases/at-charset/index.js

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+import "./a.css";
+import "./b.css";

test/cases/at-charset/webpack.config.js

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+import Self from "../../../src";
+
+module.exports = {
+  entry: "./index.js",
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, "css-loader"],
+      },
+    ],
+  },
+  plugins: [
+    new Self({
+      filename: "[name].css",
+    }),
+  ],
+};