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

@@ -0,0 +1,5 @@
+@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;
+}
+