test(server): add tests that spy and mock htmlparser2 and domhandler

remarkablemark · Nov 3, 2019 · 61075a1 · 61075a1
1 parent 3684dac
commit 61075a1
Showing 1 changed file with 78 additions and 0 deletions.
diff --git a/test/server/index.js b/test/server/index.js
@@ -0,0 +1,78 @@
+const { expect } = require('chai');
+const sinon = require('sinon');
+const mock = require('mock-require');
+
+let parser;
+let ParserSpy;
+let parserEndSpy;
+let DomHandlerSpy;
+
+const html = '<html>';
+const dom = [
+  {
+    type: 'tag',
+    name: 'html',
+    attribs: {},
+    children: [],
+    next: null,
+    prev: null,
+    parent: null
+  }
+];
+
+function clearRequireCache() {
+  Object.keys(require.cache).forEach(function(key) {
+    delete require.cache[key];
+  });
+}
+
+describe('server parser', () => {
+  // before
+  parserEndSpy = sinon.spy();
+  ParserSpy = sinon.spy(function() {
+    this.end = parserEndSpy;
+  });
+  DomHandlerSpy = sinon.spy(function() {
+    this.dom = dom;
+  });
+
+  // tests
+  mock('htmlparser2/lib/Parser', ParserSpy);
+  mock('domhandler', DomHandlerSpy);
+  parser = require('../..');
+
+  it('calls `domhandler` and `htmlparser2/lib/Parser`', () => {
+    parser(html);
+    expect(DomHandlerSpy.called).to.equal(true);
+    expect(ParserSpy.called).to.equal(true);
+    expect(parserEndSpy.called).to.equal(true);
+  });
+
+  it.skip('uses the cached instance of `domhandler` if options is undefined', () => {
+    expect(DomHandlerSpy.callCount).to.equal(1);
+    expect(ParserSpy.callCount).to.equal(1);
+    parser(html);
+    expect(DomHandlerSpy.callCount).to.equal(1);
+    expect(ParserSpy.callCount).to.equal(2);
+  });
+
+  it('passes options to `domhandler` and arguments to `htmlparser2/lib/Parser`', () => {
+    const options = { decodeEntities: true };
+    parser(html, options);
+    expect(DomHandlerSpy.calledWith(options)).to.equal(true);
+    expect(ParserSpy.calledWith(DomHandlerSpy, options));
+  });
+
+  it('passes html to `htmlparser2/lib/Parser` end', () => {
+    parser(html);
+    expect(parserEndSpy.calledWith(html)).to.equal(true);
+  });
+
+  it('returns `domhandler` dom', () => {
+    expect(parser(html)).to.equal(DomHandlerSpy.lastCall.returnValue.dom);
+  });
+
+  // after
+  mock.stopAll();
+  clearRequireCache();
+});