Add types to tests/composer/test/json (#10222)

Co-authored-by: Jakob Vibe <jv@ipw.dk>

tests/Composer/Test/Json/ComposerSchemaTest.php

@@ -90,6 +90,11 @@ class ComposerSchemaTest extends TestCase
         $this->assertTrue($this->check($json), 'stable');
     }
 
+    /**
+     *
+     * @param string $json
+     * @return mixed
+     */
     private function check($json)
     {
         $validator = new Validator();

tests/Composer/Test/Json/JsonFileTest.php

@@ -354,6 +354,11 @@ class JsonFileTest extends TestCase
         $this->assertEquals($data, $doubleData);
     }
 
+    /**
+     * @param string $text
+     * @param string $json
+     * @return void
+     */
     private function expectParseException($text, $json)
     {
         try {
@@ -364,6 +369,13 @@ class JsonFileTest extends TestCase
         }
     }
 
+    /**
+     *
+     * @param string $json
+     * @param mixed $data
+     * @param integer|null $options
+     * @return void
+     */
     private function assertJsonFormat($json, $data, $options = null)
     {
         $file = new JsonFile('composer.json');