diff --git a/tests/phpunit/tests/xmlrpc/wp/uploadFile.php b/tests/phpunit/tests/xmlrpc/wp/uploadFile.php
index 94a143f..7b68a01 100644
--- a/tests/phpunit/tests/xmlrpc/wp/uploadFile.php
+++ b/tests/phpunit/tests/xmlrpc/wp/uploadFile.php
@@ -54,4 +54,26 @@ class Tests_XMLRPC_wp_uploadFile extends WP_XMLRPC_UnitTestCase {
 		else
 			$this->assertNotInstanceOf( 'IXR_Error', $result );
 	}
+
+	/**
+	 * @ticket 11946
+	 */
+	function test_valid_mime() {
+		$this->make_user_by_role( 'editor' );
+
+		// create attachment
+		$filename = ( DIR_TESTDATA . '/images/test-image-mime-jpg.png' );
+		$contents = file_get_contents( $filename );
+		$data = array(
+			'name' => 'test-image-mime-jpg.png',
+			'type' => 'image/png',
+			'bits' => $contents
+		);
+
+		$result = $this->myxmlrpcserver->mw_newMediaObject( array( 0, 'editor', 'editor', $data ) );
+
+		$this->assertNotInstanceOf( 'IXR_Error', $result );
+
+		$this->assertEquals( 'image/jpeg', $result['type'] );
+	}
 }
\ No newline at end of file