feat(tests): fixture based tests

Author: littledivy

testing/deps.ts

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+export {
+  assert,
+  assertEquals,
+} from "https://deno.land/std@0.74.0/testing/asserts.ts";

testing/fixtures.js

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+export const comment = [
+  {
+    css: "/* body { color: black; } */",
+    ast: {
+      type: "stylesheet",
+      stylesheet: {
+        rules: [{
+          type: "comment",
+          text: " body { color: black; } ",
+        }],
+      },
+    },
+  },
+];

testing/parse_test.ts

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+import { parse } from "../core/parser/parser.ts";
+import { comment } from "./fixtures.js";
+import { assertEquals } from "./deps.ts";
+
+for (let i = 0; i < comment.length; i++) {
+  Deno.test(`[parse] - comments (${i})`, function () {
+    let ast = parse(comment[i].css, { comments: true });
+    assertEquals(ast, comment[i].ast);
+  });
+}