test: amplify and optimize doctool/test-make-doc

test/doctool/test-make-doc.js

@@ -12,32 +12,40 @@ const fs = require('fs');
 const path = require('path');
 
 const apiPath = path.resolve(__dirname, '..', '..', 'out', 'doc', 'api');
-const docs = fs.readdirSync(apiPath);
-assert.ok(docs.includes('_toc.html'));
+const allDocs = fs.readdirSync(apiPath);
+assert.ok(allDocs.includes('_toc.html'));
+
+const filter = ['assets', '_toc.html', '.md'];
+const actualDocs = allDocs.filter(
+  (name) => !filter.some((str) => name.includes(str))
+);
 
 const toc = fs.readFileSync(path.resolve(apiPath, '_toc.html'), 'utf8');
 const re = /href="([^/]+\.html)"/;
 const globalRe = new RegExp(re, 'g');
 const links = toc.match(globalRe);
 assert.notStrictEqual(links, null);
 
-// Test that all the relative links in the TOC of the documentation
-// work and all the generated documents are linked in TOC.
-const linkedHtmls = links.map((link) => link.match(re)[1]);
-for (const html of linkedHtmls) {
-  assert.ok(docs.includes(html), `${html} does not exist`);
+// Filter out duplicate links, leave just filenames, add expected JSON files.
+const linkedHtmls = [...new Set(links)].map((link) => link.match(re)[1]);
+const expectedJsons = linkedHtmls
+                       .map((name) => name.replace('.html', '.json'))
+                       .concat('_toc.json');
+const expectedDocs = linkedHtmls.concat(expectedJsons);
+
+// Test that all the relative links in the TOC match to the actual documents.
+for (const expectedDoc of expectedDocs) {
+  assert.ok(actualDocs.includes(expectedDoc), `${expectedDoc} does not exist`);
 }
 
-const excludes = ['.json', '.md', '_toc', 'assets'];
-const generatedHtmls = docs.filter(function(doc) {
-  for (const exclude of excludes) {
-    if (doc.includes(exclude)) {
-      return false;
-    }
-  }
-  return true;
-});
-
-for (const html of generatedHtmls) {
-  assert.ok(linkedHtmls.includes(html), `${html} is not linked in toc`);
+// Test that all the actual documents match to the relative links in the TOC
+// and that they are not empty files.
+for (const actualDoc of actualDocs) {
+  assert.ok(
+    expectedDocs.includes(actualDoc), `${actualDoc} does not not match TOC`);
+
+  assert.ok(
+    fs.statSync(path.join(apiPath, actualDoc)).size !== 0,
+    `${actualDoc} is empty`
+  );
 }