Add a few tests on consolidated CSS file

test/css/consolidated.js

@@ -0,0 +1,46 @@
+/**
+ * Test the consolidated css.json file in the curated view.
+ */
+
+import { describe, it } from 'node:test';
+import { strict as assert } from 'node:assert';
+import consolidated from '../../curated/css.json' with { type: 'json' };
+import { definitionSyntax } from 'css-tree';
+
+// Expected categories in the consolidated file
+const categories = {
+  atrules: { singular: 'at-rule', plural: 'at-rules' },
+  functions: { singular: 'function', plural: 'functions' },
+  properties: { singular: 'property', plural: 'properties' },
+  selectors: { singular: 'selector', plural: 'selectors' },
+  types: { singular: 'type', plural: 'types' }
+};
+
+describe(`The consolidated CSS file`, async () => {
+  for (const [category, { singular, plural }] of Object.entries(categories)) {
+    const list = consolidated[category];
+
+    it(`contains ${plural}`, () => {
+      assert(list);
+      assert(list.length > 0);
+    });
+
+    it(`does not contain duplicated ${plural}`, () => {
+      const keys = list.map(entry => entry.name +
+        (entry.for ? ` for ${entry.for}` : ''));
+      const duplicates = keys.filter((key, idx) =>
+        keys.findIndex(k => k === key) !== idx);
+      assert.deepEqual(duplicates, []);
+    });
+
+    it(`contains valid ${singular} syntaxes`, () => {
+      const invalid = list
+        .filter(entry => entry.value)
+        .filter(entry => {
+          const ast = definitionSyntax.parse(entry.value);
+          return !ast.type;
+        });
+      assert.deepEqual(invalid, []);
+    });
+  }
+});