test: test make doc and verify toc

PR-URL: #16208
Fixes: nodejs/build#887
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

Makefile

@@ -200,6 +200,7 @@ else
 test: all
 	$(MAKE) build-addons
 	$(MAKE) build-addons-napi
+	$(MAKE) doc
 	$(MAKE) cctest
 	$(PYTHON) tools/test.py --mode=release -J \
 		$(CI_ASYNC_HOOKS) \
@@ -379,7 +380,7 @@ test-ci-js: | clear-stalled
 	fi
 
 test-ci: LOGLEVEL := info
-test-ci: | clear-stalled build-addons build-addons-napi
+test-ci: | clear-stalled build-addons build-addons-napi doc
 	out/Release/cctest --gtest_output=tap:cctest.tap
 	$(PYTHON) tools/test.py $(PARALLEL_ARGS) -p tap --logfile test.tap \
 		--mode=release --flaky-tests=$(FLAKY_TESTS) \
@@ -515,7 +516,7 @@ doc: $(NODE_EXE) doc-only
 $(apidoc_dirs):
 	mkdir -p $@
 
-out/doc/api/assets/%: doc/api_assets/% out/doc/api/assets/
+out/doc/api/assets/%: doc/api_assets/% out/doc/api/assets
 	cp $< $@
 
 out/doc/%: doc/%

test/sequential/test-make-doc.js

@@ -0,0 +1,43 @@
+'use strict';
+const common = require('../common');
+if (common.isWindows) {
+  common.skip('`make doc` does not run on Windows');
+}
+
+// This tests that `make doc` generates the documentation properly.
+// Note that for this test to pass, `make doc` must be run first.
+
+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+
+const apiPath = path.resolve(common.projectDir, 'out', 'doc', 'api');
+const docs = fs.readdirSync(apiPath);
+assert.ok(docs.includes('_toc.html'));
+
+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), `${html} does not exist`);
+}
+
+const excludes = ['.json', '_toc', 'assets'];
+const generatedHtmls = docs.filter(function(doc) {
+  for (const exclude of excludes) {
+    if (doc.includes(exclude)) {
+      return false;
+    }
+  }
+  return true;
+});
+
+for (const html of generatedHtmls) {
+  assert.ok(linkedHtmls.includes(html), `${html} is not linked in toc`);
+}