test: public path (#857)

Author: alexander-akait

test/cases/publicpath-absolute-url-5/expected/c9e192c015437a21dea1.svg

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+body {
+  background: red;
+  background-image: url(/c9e192c015437a21dea1.svg);
+}
+

test/cases/publicpath-absolute-url-5/expected/main.css

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+import "./style.css";

test/cases/publicpath-absolute-url-5/index.js

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+body {
+  background: red;
+  background-image: url(./react.svg);
+}

test/cases/publicpath-absolute-url-5/react.svg

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