setup basic test

packages/purgecss/__tests__/rejectedCss.test.ts

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+import PurgeCSS from "./../src/index";
+import { ROOT_TEST_EXAMPLES } from "./utils";
+
+describe("rejectedCss", () => {
+  it("returns the rejected css as part of the result", async () => {
+    expect.assertions(1);
+    const resultsPurge = await new PurgeCSS().purge({
+      content: [`${ROOT_TEST_EXAMPLES}rejectedCss/simple.js`],
+      css: [`${ROOT_TEST_EXAMPLES}rejectedCss/simple.css`],
+      rejectedCss: true,
+    });
+    const expected = `
+.rejected {
+    color: blue;
+}
+`;
+    expect(resultsPurge[0].rejectedCss).toBe(expected);
+  });
+});

packages/purgecss/__tests__/test_examples/rejectedCss/simple.css

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+.critical {
+    color: red;
+}
+
+.rejected {
+    color: blue;
+}

packages/purgecss/__tests__/test_examples/rejectedCss/simple.js

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+
+"critical"