diff --git a/tests/PHPUnit/CustomSuffix/A Test With Spaces.php b/tests/PHPUnit/CustomSuffix/A Test With Spaces.php
new file mode 100644
index 00000000..1fa89600
--- /dev/null
+++ b/tests/PHPUnit/CustomSuffix/A Test With Spaces.php	
@@ -0,0 +1,4 @@
+<?php
+
+test(sprintf('this runs file names like "%s"', basename(__FILE__)))
+    ->assertTrue(true);
diff --git a/tests/PHPUnit/CustomSuffix/AdditionalFileExtension.spec.php b/tests/PHPUnit/CustomSuffix/AdditionalFileExtension.spec.php
new file mode 100644
index 00000000..1fa89600
--- /dev/null
+++ b/tests/PHPUnit/CustomSuffix/AdditionalFileExtension.spec.php
@@ -0,0 +1,4 @@
+<?php
+
+test(sprintf('this runs file names like "%s"', basename(__FILE__)))
+    ->assertTrue(true);
diff --git a/tests/PHPUnit/CustomSuffix/ManyExtensions.class.test.php b/tests/PHPUnit/CustomSuffix/ManyExtensions.class.test.php
new file mode 100644
index 00000000..1fa89600
--- /dev/null
+++ b/tests/PHPUnit/CustomSuffix/ManyExtensions.class.test.php
@@ -0,0 +1,4 @@
+<?php
+
+test(sprintf('this runs file names like "%s"', basename(__FILE__)))
+    ->assertTrue(true);
diff --git a/tests/PHPUnit/CustomSuffix/kebab-case-spec.php b/tests/PHPUnit/CustomSuffix/kebab-case-spec.php
new file mode 100644
index 00000000..1fa89600
--- /dev/null
+++ b/tests/PHPUnit/CustomSuffix/kebab-case-spec.php
@@ -0,0 +1,4 @@
+<?php
+
+test(sprintf('this runs file names like "%s"', basename(__FILE__)))
+    ->assertTrue(true);
diff --git a/tests/PHPUnit/CustomSuffix/snake_case_spec.php b/tests/PHPUnit/CustomSuffix/snake_case_spec.php
new file mode 100644
index 00000000..1fa89600
--- /dev/null
+++ b/tests/PHPUnit/CustomSuffix/snake_case_spec.php
@@ -0,0 +1,4 @@
+<?php
+
+test(sprintf('this runs file names like "%s"', basename(__FILE__)))
+    ->assertTrue(true);