Throw error and disable suite for duplicate testcases in describe ins…

…tance. (#4302)

Co-authored-by: Priyansh Garg <priyanshgarg30@gmail.com>

lib/testsuite/context.js

@@ -316,7 +316,20 @@ class Context extends EventEmitter {
       throw new Error(`The "${testName}" test script must be a function. "${typeof testFn}" given.`);
     }
 
-    // TODO: warn if test name already exists
+    if (this.allScreenedTests.includes(testName)) {
+      const {Logger} = Utils;
+
+      const err = new Error(
+        'An error occurred while loading the testsuite:\n' +
+        `A testcase with name "${testName}" already exists. Testcases must have unique names inside the test suite, ` +
+        'otherwise testcases with duplicate names might not run at all.\n\n' +
+        'This testsuite has been disabled, please fix the error to run it again properly.'
+      );
+      Logger.error(err);
+
+      this.setAttribute('@disabled', true);
+    }
+
     if (!skipTest) {
       this.tests.push(testName);
     } else {

lib/testsuite/interfaces/describe.js

@@ -229,8 +229,10 @@ class Describe extends Common {
       context.xcontext =
         context.describe.skip = (title, describeFn) => {
           this.instance.once('module-loaded', () => {
-            // in case tests have been declared using other interfaces (e.g. exports)
+            // in case tests have been declared using other interfaces (e.g. exports),
+            // we do not want to disable the suite.
             if (this.instance.tests.length === 0) {
+              // if no tests are added after all interfaces are loaded, disable the suite.
               this.instance.setAttribute('@disabled', true);
             }
           });

test/sampletests/withdescribe/skipped/duplicateTestcases.js

@@ -0,0 +1,11 @@
+describe('test', function () {
+  test('test find', async (browser) => {
+    browser.globals.calls++;
+    browser.element.find('#weblogin');
+  });
+
+  test('test find', async (browser) => {
+    browser.globals.calls++;
+    browser.element.find('#weblogin');
+  });
+});

test/src/runner/testRunTestcase.js

@@ -266,6 +266,25 @@ describe('testRunTestcase', function() {
     }));
   });
 
+  it('testRunner with duplicated testcases', function() {
+    const testsPath = path.join(__dirname, '../../sampletests/withdescribe/skipped/duplicateTestcases.js');
+    const globals = {
+      calls: 0,
+      reporter(results, cb) {
+        assert.strictEqual(globals.calls, 0);
+        assert.strictEqual(results.skipped, 2);
+        cb();
+      },
+      retryAssertionTimeout: 0
+    };
+
+    return runTests({
+      _source: [testsPath]
+    }, settings({
+      globals
+    }));
+  });
+
   it('testRunner with skipped beforeEach afterEach hooks', function() {
     const testsPath = path.join(__dirname, '../../sampletests/withdescribe/skipped/skipBeforeAfterEach.js');
     const globals = {