diff --git a/tests/CollectionTest.php b/tests/CollectionTestCase.php
similarity index 99%
rename from tests/CollectionTest.php
rename to tests/CollectionTestCase.php
index 1dc1932..f4ad8a6 100644
--- a/tests/CollectionTest.php
+++ b/tests/CollectionTestCase.php
@@ -7,7 +7,7 @@
 use function strpos;
 use function var_dump;
 
-abstract class CollectionTest extends TestCase
+abstract class CollectionTestCase extends TestCase
 {
     /**
      * Sample sizes.
diff --git a/tests/HeapTest.php b/tests/HeapTest.php
index 036b226..de4c71d 100644
--- a/tests/HeapTest.php
+++ b/tests/HeapTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Ds\Tests;
 
-class HeapTest extends CollectionTest
+class HeapTest extends CollectionTestCase
 {
     use Heap\__construct;
     use Heap\_clone;
diff --git a/tests/MapTest.php b/tests/MapTest.php
index cbd73a3..4cb9e09 100644
--- a/tests/MapTest.php
+++ b/tests/MapTest.php
@@ -3,7 +3,7 @@
 
 use ArrayAccess;
 
-class MapTest extends CollectionTest
+class MapTest extends CollectionTestCase
 {
     use Map\__construct;
     use Map\_clone;
diff --git a/tests/PairTest.php b/tests/PairTest.php
index dcca51d..c8beded 100644
--- a/tests/PairTest.php
+++ b/tests/PairTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Ds\Tests;
 
-class PairTest extends CollectionTest
+class PairTest extends CollectionTestCase
 {
     use Pair\__construct;
     use Pair\__get;
diff --git a/tests/SeqTest.php b/tests/SeqTest.php
index 562e7e7..87ee661 100644
--- a/tests/SeqTest.php
+++ b/tests/SeqTest.php
@@ -3,7 +3,7 @@
 
 use ArrayAccess;
 
-class SeqTest extends CollectionTest
+class SeqTest extends CollectionTestCase
 {
     use Seq\__construct;
     use Seq\_clone;
diff --git a/tests/SetTest.php b/tests/SetTest.php
index 10b910b..c6e5ae5 100644
--- a/tests/SetTest.php
+++ b/tests/SetTest.php
@@ -3,7 +3,7 @@
 
 use ArrayAccess;
 
-class SetTest extends CollectionTest
+class SetTest extends CollectionTestCase
 {
     use Set\__construct;
     use Set\_clone;