diff --git a/tests/Reducer/DispatcherTestCase.php b/tests/Reducer/DispatcherTestCase.php
index 8ef5600a..e6caa2ba 100644
--- a/tests/Reducer/DispatcherTestCase.php
+++ b/tests/Reducer/DispatcherTestCase.php
@@ -28,6 +28,14 @@ protected function setUp(): void
         $this->bug->setSteps(array_map(fn () => $this->createMock(StepInterface::class), range(1, 11)));
     }
 
+    public function testDispatchTooShortSteps(): void
+    {
+        $this->bug->setSteps([$this->createMock(StepInterface::class)]);
+        $this->messageBus->expects($this->never())->method('dispatch');
+        $this->assertSame(0, $this->dispatcher->dispatch($this->bug));
+        $this->assertPairs(0);
+    }
+
     public function testDispatch(): void
     {
         $this->messageBus
@@ -63,8 +71,8 @@ protected function assertMessage(): Callback
         });
     }
 
-    protected function assertPairs(): void
+    protected function assertPairs(int $count = 4): void
     {
-        $this->assertCount(4, $this->pairs);
+        $this->assertCount($count, $this->pairs);
     }
 }
diff --git a/tests/Reducer/Split/SplitDispatcherTest.php b/tests/Reducer/Split/SplitDispatcherTest.php
index 852ad0d1..54ab7f40 100644
--- a/tests/Reducer/Split/SplitDispatcherTest.php
+++ b/tests/Reducer/Split/SplitDispatcherTest.php
@@ -22,14 +22,16 @@ protected function setUp(): void
         $this->dispatcher = new SplitDispatcher($this->messageBus);
     }
 
-    protected function assertPairs(): void
+    protected function assertPairs(int $count = 4): void
     {
-        parent::assertPairs();
-        $this->assertSame([
-            [0, 3],
-            [3, 6],
-            [6, 9],
-            [9, 10],
-        ], $this->pairs);
+        parent::assertPairs($count);
+        if (4 === $count) {
+            $this->assertSame([
+                [0, 3],
+                [3, 6],
+                [6, 9],
+                [9, 10],
+            ], $this->pairs);
+        }
     }
 }