diff --git a/lib/internal/test_runner/reporter/dot.js b/lib/internal/test_runner/reporter/dot.js
index 45ff047bc4e5a0..fa29fdc73499fa 100644
--- a/lib/internal/test_runner/reporter/dot.js
+++ b/lib/internal/test_runner/reporter/dot.js
@@ -10,6 +10,7 @@ module.exports = async function* dot(source) {
   let count = 0;
   let columns = getLineLength();
   const failedTests = [];
+  const diagnostics = [];
   for await (const { type, data } of source) {
     if (type === 'test:pass') {
       yield `${colors.green}.${colors.reset}`;
@@ -18,6 +19,9 @@ module.exports = async function* dot(source) {
       yield `${colors.red}X${colors.reset}`;
       ArrayPrototypePush(failedTests, data);
     }
+    if (type === 'test:diagnostic') {
+      ArrayPrototypePush(diagnostics, data);
+    }
     if ((type === 'test:fail' || type === 'test:pass') && ++count === columns) {
       yield '\n';
 
@@ -33,6 +37,12 @@ module.exports = async function* dot(source) {
       yield formatTestReport('test:fail', test);
     }
   }
+  if (diagnostics.length > 0) {
+    yield `\n${colors.yellow}Diagnostics:${colors.white}\n\n`;
+    for (const diag of diagnostics) {
+      yield `${colors.yellow}! ${diag.message}${colors.reset}\n`;
+    }
+  }
 };
 
 function getLineLength() {