Remove assertIsArray() with array will always evaluate to true.

tests/plugins/webp-uploads/helper-tests.php

@@ -374,7 +374,6 @@ public function it_should_return_empty_array_when_filter_returns_empty_array() {
 
 		$transforms = webp_uploads_get_upload_image_mime_transforms();
 
-		$this->assertIsArray( $transforms );
 		$this->assertSame( array(), $transforms );
 	}
 
@@ -404,7 +403,6 @@ public function it_should_return_default_transforms_when_filter_returns_non_arra
 
 		$transforms = webp_uploads_get_upload_image_mime_transforms();
 
-		$this->assertIsArray( $transforms );
 		$this->assertSame( $default_transforms, $transforms );
 	}
 
@@ -423,7 +421,6 @@ static function () {
 
 		$transforms = webp_uploads_get_upload_image_mime_transforms();
 
-		$this->assertIsArray( $transforms );
 		$this->assertSame( array( 'image/jpeg' => array( 'image/jpeg' ) ), $transforms );
 	}
 
@@ -442,7 +439,6 @@ static function () {
 
 		$transforms = webp_uploads_get_upload_image_mime_transforms();
 
-		$this->assertIsArray( $transforms );
 		$this->assertSame( array( 'image/jpeg' => array( 'image/jpeg', 'image/webp' ) ), $transforms );
 	}
 
@@ -460,8 +456,6 @@ public function it_should_return_jpeg_and_webp_transforms_when_option_generate_w
 
 		$transforms = webp_uploads_get_upload_image_mime_transforms();
 
-		$this->assertIsArray( $transforms );
-
 		// The returned value depends on whether the server supports AVIF.
 		if ( webp_uploads_mime_type_supported( 'image/avif' ) ) {
 			$this->assertSame(