diff --git a/src/unit/engine/ArcanistConfigurationDrivenUnitTestEngine.php b/src/unit/engine/ArcanistConfigurationDrivenUnitTestEngine.php
--- a/src/unit/engine/ArcanistConfigurationDrivenUnitTestEngine.php
+++ b/src/unit/engine/ArcanistConfigurationDrivenUnitTestEngine.php
@@ -115,6 +115,9 @@
   }
 
   public function run() {
+    $renderer = $this->renderer;
+    $this->setRenderer(null);
+
     $paths = $this->getPaths();
 
     // If we are running with `--everything` then `$paths` will be `null`.
@@ -129,7 +132,8 @@
     foreach ($engines as $engine) {
       $engine
         ->setWorkingCopy($this->getWorkingCopy())
-        ->setEnableCoverage($this->getEnableCoverage());
+        ->setEnableCoverage($this->getEnableCoverage())
+        ->setRenderer($renderer);
 
       // TODO: At some point, maybe we should emit a warning here if an engine
       // doesn't support `--everything`, to reduce surprise when `--everything`
@@ -141,6 +145,12 @@
       try {
         // TODO: Type check the results.
         $results[] = $engine->run();
+
+        foreach (last($results) as $result) {
+          if ($engine->shouldEchoTestResults()) {
+            echo $renderer->renderUnitResult($result);
+          }
+        }
       } catch (ArcanistNoEffectException $ex) {
         $exceptions[] = $ex;
       }
@@ -155,6 +165,10 @@
     return array_mergev($results);
   }
 
+  public function shouldEchoTestResults() {
+    return false;
+  }
+
   private function loadAvailableTestEngines() {
     return id(new PhutilClassMapQuery())
       ->setAncestorClass('ArcanistUnitTestEngine')
diff --git a/src/unit/engine/ArcanistUnitTestEngine.php b/src/unit/engine/ArcanistUnitTestEngine.php
--- a/src/unit/engine/ArcanistUnitTestEngine.php
+++ b/src/unit/engine/ArcanistUnitTestEngine.php
@@ -98,7 +98,7 @@
     return $this->enableCoverage;
   }
 
-  final public function setRenderer(ArcanistUnitRenderer $renderer) {
+  final public function setRenderer(ArcanistUnitRenderer $renderer = null) {
     $this->renderer = $renderer;
     return $this;
   }