remove php from resolvers. Only PHP renderer can add it

src/Renderer/SimplePhpRenderer.php

@@ -29,7 +29,7 @@ class SimplePhpRenderer implements Renderer
 
     /**
      * @param string $template
-     * @param array $params
+     * @param array|null $params
      *
      * @return string
      */
@@ -40,7 +40,7 @@ class SimplePhpRenderer implements Renderer
         }
 
         ob_start();
-        include($this->resolver->resolve($template));
+        include($this->resolver->resolve($template . '.php'));
 
         return ob_get_clean();
     }

src/Resolver/DirResolver.php

@@ -39,7 +39,7 @@ class DirResolver implements Resolver
     public function resolve($name, Renderer $renderer = null)
     {
         $dir = rtrim($this->dir, '/');
-        $fullName = $dir . '/' . $name . '.php';
+        $fullName = $dir . '/' . $name;
         if (file_exists($fullName)) {
             return $fullName;
         }

src/Resolver/WPThemeResolver.php

@@ -40,7 +40,7 @@ class WPThemeResolver implements Resolver
     {
         $templateFile = locate_template(
             [
-                trailingslashit($this->template_base_path) . $name . '.php',
+                trailingslashit($this->template_base_path) . $name,
             ]
         );
         if ( ! $templateFile) {

tests/unit/Resolver/TestChainResolver.php

@@ -28,7 +28,7 @@ class TestChainResolver extends \PHPUnit\Framework\TestCase
             ->andReturn(self::RESPONSE_OF_RESOLVER);
 
         $resolver = new ChainResolver(new NullResolver(), new NullResolver(), $validResolver);
-        $this->assertEquals(self::RESPONSE_OF_RESOLVER, $resolver->resolve('whatever'));
+        $this->assertEquals(self::RESPONSE_OF_RESOLVER, $resolver->resolve('whatever.php'));
     }
 
     public function testUseFirstResolverFirst()
@@ -39,7 +39,7 @@ class TestChainResolver extends \PHPUnit\Framework\TestCase
             ->andReturn(self::RESPONSE_OF_RESOLVER);
 
         $resolver = new ChainResolver($validResolver, new NullResolver(), new NullResolver());
-        $this->assertEquals(self::RESPONSE_OF_RESOLVER, $resolver->resolve('whatever'));
+        $this->assertEquals(self::RESPONSE_OF_RESOLVER, $resolver->resolve('whatever.php'));
     }
 
     public function testThrowExceptionWhenBothCannotFind()

tests/unit/Resolver/TestDirResolver.php

@@ -5,7 +5,7 @@ use WPDesk\View\Resolver\Exception\CanNotResolve;
 
 class TestDirResolver extends \PHPUnit\Framework\TestCase
 {
-    const TEMPLATE_NAME = 'some_template';
+    const TEMPLATE_NAME = 'some_template.php';
     const TEMPLATE_FILE = 'some_template.php';
     const TEMPLATE_SUBDIR = 'templates';
 

tests/unit/Resolver/TestWpThemeResolver.php

@@ -5,7 +5,7 @@ use WPDesk\View\Resolver\Exception\CanNotResolve;
 
 class TestThemeResolver extends \PHPUnit\Framework\TestCase
 {
-    const TEMPLATE_NAME = 'some_template';
+    const TEMPLATE_NAME = 'some_template.php';
     const TEMPLATE_FILE = 'some_template.php';
     const TEMPLATE_SUBDIR = 'templates';