ci: Find duplicate and slow tests (#9188)

spec/support/CurrentSpecReporter.js

@@ -1,15 +1,45 @@
 // Sets a global variable to the current test spec
 // ex: global.currentSpec.description
-
+const { performance } = require('perf_hooks');
 global.currentSpec = null;
 
+const timerMap = {};
+const duplicates = [];
+/** The minimum execution time in seconds for a test to be considered slow. */
+const slowTestLimit = 2;
+
 class CurrentSpecReporter {
   specStarted(spec) {
+    if (timerMap[spec.fullName]) {
+      console.log('Duplicate spec: ' + spec.fullName);
+      duplicates.push(spec.fullName);
+    }
+    timerMap[spec.fullName] = performance.now();
     global.currentSpec = spec;
   }
-  specDone() {
+  specDone(result) {
+    if (result.status === 'excluded') {
+      delete timerMap[result.fullName];
+      return;
+    }
+    timerMap[result.fullName] = (performance.now() - timerMap[result.fullName]) / 1000;
     global.currentSpec = null;
   }
 }
+global.displaySlowTests = function() {
+  const times = Object.values(timerMap).sort((a,b) => b - a);
+  if (times.length > 0) {
+    console.log(`Slow tests with execution time >=${slowTestLimit}s:`);
+  }
+  times.forEach((time) => {
+    if (time >= slowTestLimit) {
+      console.warn(`${time.toFixed(1)}s:`, Object.keys(timerMap).find(key => timerMap[key] === time));
+    }
+  });
+  console.log('\n');
+  duplicates.forEach((spec) => {
+    console.warn('Duplicate spec: ' + spec);
+  });
+};
 
 module.exports = CurrentSpecReporter;