Drop dependency on chai for tests

package.json

@@ -42,7 +42,6 @@
     "webidl2": "24.4.1"
   },
   "devDependencies": {
-    "chai": "4.3.10",
     "mocha": "10.3.0",
     "respec": "34.4.0",
     "respec-hljs": "2.1.1",

tests/crawl.js

@@ -30,7 +30,7 @@ async function runWithAnnotatedCrawlData(path, fn) {
 }
 
 if (global.describe && describe instanceof Function) {
-  const { assert } = require('chai');
+  const assert = require('assert');
 
   describe("The crawler", function () {
     this.slow(20000);
@@ -109,7 +109,7 @@ if (global.describe && describe instanceof Function) {
           fallback
         }));
       assert.equal(results[0].title, "Change is the only constant");
-      assert.isUndefined(results[0].error);
+      assert.ifError(results[0].error);
       assert.equal(results[0].refs, "A useful list of refs");
     })
 
@@ -119,7 +119,7 @@ if (global.describe && describe instanceof Function) {
         [{ url, nightly: { url } }],
         { forceLocalFetch: true });
       assert.equal(results[0].title, "[Could not be determined, see error]");
-      assert.include(results[0].error, "Loading https://www.w3.org/TR/idontexist/ triggered HTTP status 404");
+      assert(results[0].error.includes("Loading https://www.w3.org/TR/idontexist/ triggered HTTP status 404"));
     });
 
     it("reports errors and returns fallback data when possible", async () => {
@@ -132,7 +132,7 @@ if (global.describe && describe instanceof Function) {
           fallback
         });
       assert.equal(results[0].title, "On the Internet, nobody knows you don't exist");
-      assert.include(results[0].error, "Loading https://www.w3.org/TR/idontexist/ triggered HTTP status 404");
+      assert(results[0].error.includes("Loading https://www.w3.org/TR/idontexist/ triggered HTTP status 404"));
       assert.equal(results[0].refs, "A useful list of refs");
     });
 
@@ -147,7 +147,7 @@ if (global.describe && describe instanceof Function) {
       });
       const results = require(path.resolve(output, "index.json"));
       assert.equal(results.results[0].url, "https://www.w3.org/TR/idontexist/");
-      assert.include(results.results[0].error, "Loading https://www.w3.org/TR/idontexist/ triggered HTTP status 404");
+      assert(results.results[0].error.includes("Loading https://www.w3.org/TR/idontexist/ triggered HTTP status 404"));
       assert.equal(results.results[0].refs, "refs/idontexist.json");
       const refs = require(path.resolve(output, "refs", "idontexist.json"));
       assert.equal(refs.refs, "A useful list of refs");
@@ -159,7 +159,7 @@ if (global.describe && describe instanceof Function) {
         [{ url, nightly: { url } }],
         { forceLocalFetch: true });
       assert.equal(results[0].title, "[Could not be determined, see error]");
-      assert.include(results[0].error, "CSS server issue detected");
+      assert(results[0].error.includes("CSS server issue detected"));
     });
 
     it("crawls the published spec when `--release` is set", async () => {

tests/create-outline.js

@@ -1,4 +1,4 @@
-const { assert } = require('chai');
+const assert = require('assert');
 const puppeteer = require('puppeteer');
 const path = require('path');
 const rollup = require('rollup');

tests/css-grammar-parser/test.js

@@ -1,6 +1,6 @@
 const css = require("../../src/lib/css-grammar-parser");
 const fs = require("fs");
-const expect = require('chai').expect;
+const assert = require("assert");
 
 const propDefs = fs.readFileSync("tests/css-grammar-parser/in", "utf-8").split("\n").map(def => def.trim());
 const propDefsOut = JSON.parse(fs.readFileSync("tests/css-grammar-parser/out.json", "utf-8"));
@@ -9,7 +9,7 @@ const results = propDefs.map(css.parsePropDefValue);
 describe('Parser correctly parses grammar instances', () => {
   for(let i in results) {
     it(`parses property definition ${propDefs[i]} as expected`, () => {
-      expect(results[i]).to.deep.equal(propDefsOut[i], `Parsing ${propDefs[i]} got ${JSON.stringify(results[i], null, 2)} instead of ${JSON.stringify(propDefsOut[i], null, 2)}`);
+      assert.deepStrictEqual(results[i], propDefsOut[i], `Parsing ${propDefs[i]} got ${JSON.stringify(results[i], null, 2)} instead of ${JSON.stringify(propDefsOut[i], null, 2)}`);
     });
   }
 });

tests/extract-dfns.js

@@ -1,4 +1,4 @@
-const { assert } = require('chai');
+const assert = require('assert');
 const puppeteer = require('puppeteer');
 const path = require('path');
 const rollup = require('rollup');

tests/extract-events.js

@@ -1,4 +1,4 @@
-const { assert } = require('chai');
+const assert = require('assert');
 const puppeteer = require('puppeteer');
 const path = require('path');
 const rollup = require('rollup');

tests/extract-headings.js

@@ -1,4 +1,4 @@
-const { assert } = require('chai');
+const assert = require('assert');
 const puppeteer = require('puppeteer');
 const path = require('path');
 const rollup = require('rollup');

tests/extract-ids.js

@@ -1,4 +1,4 @@
-const { assert } = require('chai');
+const assert = require('assert');
 const puppeteer = require('puppeteer');
 const path = require('path');
 const rollup = require('rollup');

tests/extract-references.js

@@ -1,4 +1,4 @@
-const { assert } = require('chai');
+const assert = require('assert');
 const puppeteer = require('puppeteer');
 const path = require('path');
 const rollup = require('rollup');

tests/extract-webidl.js

@@ -1,4 +1,4 @@
-const { assert } = require('chai');
+const assert = require('assert');
 const puppeteer = require('puppeteer');
 const path = require('path');
 const rollup = require('rollup');