test(e2e): submission of unfinished challenge urls

cypress/integration/learn/challenges/backend.js

@@ -0,0 +1,41 @@
+/* global cy */
+
+const locations = {
+  index:
+    'learn/apis-and-microservices/managing-packages-with-npm/' +
+    'how-to-use-package-json-the-core-of-any-node-js-project-or-npm-package'
+};
+
+const selectors = {
+  defaultOutput: '.output-text',
+  input: 'input[name="solution"]'
+};
+
+const unhandledErrorMessage = 'Something is not quite right';
+const runningOutput = '// running tests';
+const finishedOutput = '// tests completed';
+
+describe('Backend challenge', function() {
+  it('renders', () => {
+    cy.visit(locations.index);
+
+    cy.title().should(
+      'eq',
+      'Managing Packages with Npm - How to Use package.json, the Core of Any' +
+        ' Node.js Project or npm Package | Learn | freeCodeCamp.org'
+    );
+  });
+
+  it('does not generate unhandled errors on submission', () => {
+    cy.visit(locations.index);
+    cy.get(selectors.input)
+      .type('https://example.com')
+      .type('{enter}')
+      .then(() => {
+        cy.get(selectors.defaultOutput)
+          .contains(runningOutput)
+          .contains(finishedOutput);
+        cy.contains(unhandledErrorMessage).should('not.exist');
+      });
+  });
+});