Remove dot from extension

Author: sebastiandedeyne

src/Drivers/JsonDriver.php

@@ -19,7 +19,7 @@ public function serialize($data): string
 
     public function extension(): string
     {
-        return '.json';
+        return 'json';
     }
 
     public function match($expected, $actual)

src/Drivers/VarDriver.php

@@ -14,7 +14,7 @@ public function serialize($data): string
 
     public function extension(): string
     {
-        return '.php';
+        return 'php';
     }
 
     public function match($expected, $actual)

src/Drivers/XmlDriver.php

@@ -26,7 +26,7 @@ public function serialize($data): string
 
     public function extension(): string
     {
-        return '.xml';
+        return 'xml';
     }
 
     public function match($expected, $actual)

src/Snapshot.php

@@ -40,7 +40,7 @@ public function id(): string
 
     public function filename(): string
     {
-        return $this->id.$this->driver->extension();
+        return $this->id.'.'.$this->driver->extension();
     }
 
     public function exists(): bool

tests/Unit/SnapshotTest.php

@@ -37,7 +37,7 @@ public function it_has_a_filename_based_on_its_id_and_its_drivers_extension()
         $this->driver
             ->expects($this->once())
             ->method('extension')
-            ->willReturn('.php');
+            ->willReturn('php');
 
         $snapshot = new Snapshot('abc', $this->filesystem, $this->driver);