diff --git a/DIRECTORY.md b/DIRECTORY.md
index 6a5139c..995e7a4 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -188,6 +188,7 @@
     * [Stringstest](./tests/Strings/StringsTest.php)
   * Utils
     * [Arrayhelperstest](./tests/Utils/ArrayHelpersTest.php)
+    * [Executiontimetest](./tests/Utils/ExecutionTimeTest.php)
 
 ## Utils
   * [Arrayhelpers](./Utils/ArrayHelpers.php)
diff --git a/tests/Utils/ExecutionTimeTest.php b/tests/Utils/ExecutionTimeTest.php
new file mode 100644
index 0000000..14bc0df
--- /dev/null
+++ b/tests/Utils/ExecutionTimeTest.php
@@ -0,0 +1,46 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+require_once __DIR__ . '/../../Utils/ExecutionTime.php';
+
+class ExecutionTimeTest extends TestCase
+{
+    public function testReportsElapsedTimeOnlyOnDestruct(): void
+    {
+        ob_start();
+        $timer = new ExecutionTime();
+        usleep(1000); // 1 ms of measured work
+
+        // Nothing is printed while the timer is alive...
+        $this->assertSame('', ob_get_contents());
+
+        unset($timer); // ...the report is emitted by __destruct()
+
+        $output = ob_get_clean();
+
+        $this->assertMatchesRegularExpression('/^Executed in \d+\.\d+ seconds$/', $output);
+    }
+
+    public function testMeasuredIntervalExceedsSleepDuration(): void
+    {
+        $sleepMicroseconds = 20000; // 20 ms
+
+        ob_start();
+        $timer = new ExecutionTime();
+        usleep($sleepMicroseconds);
+        unset($timer);
+        ob_end_clean();
+
+        // Re-run with a capture of the measured value to assert ordering.
+        ob_start();
+        $timer = new ExecutionTime();
+        usleep($sleepMicroseconds);
+        unset($timer);
+        $output = ob_get_clean();
+
+        $this->assertSame(1, preg_match('/Executed in (\d+\.\d+) seconds/', $output, $matches));
+        $this->assertGreaterThanOrEqual($sleepMicroseconds / 1_000_000, (float) $matches[1]);
+    }
+}