diff --git a/tests/Unit/Expectations/OppositeExpectation.php b/tests/Unit/Expectations/OppositeExpectation.php
new file mode 100644
index 00000000..448ebf6d
--- /dev/null
+++ b/tests/Unit/Expectations/OppositeExpectation.php
@@ -0,0 +1,16 @@
+<?php
+
+use Pest\Expectations\OppositeExpectation;
+use PHPUnit\Framework\ExpectationFailedException;
+
+it('throw expectation failed exception with string argument', function (): void {
+    $expectation = new OppositeExpectation(expect('foo'));
+
+    $expectation->throwExpectationFailedException('toBe', 'bar');
+})->throws(ExpectationFailedException::class, "Expecting 'foo' not to be 'bar'.");
+
+it('throw expectation failed exception with array argument', function (): void {
+    $expectation = new OppositeExpectation(expect('foo'));
+
+    $expectation->throwExpectationFailedException('toBe', ['bar']);
+})->throws(ExpectationFailedException::class, "Expecting 'foo' not to be 'bar'.");