better can be decoded check

Author: johanrosenson

src/Json.php

@@ -30,8 +30,10 @@ private static function assertCanEncode($value) : void
         }
     }
 
-    private static function assertCanDecode($value) : void
+    private static function assertCanDecode(string $value) : void
     {
+        $value = \trim($value);
+
         $ends = \mb_substr($value, 0, 1) . \mb_substr($value, -1);
 
         if (! \in_array($ends, ['[]', '{}'], true)) {

tests/JsonDecodeAssocTest.php

@@ -41,4 +41,28 @@ public function decode_assoc_decodes_key_value_object_as_assoc_array() : void
 
         $this->assertEquals($expectedOutput, $output);
     }
+
+    /** @test */
+    public function string_starting_or_ending_with_whitespace_can_be_decoded() : void
+    {
+        $input = '
+            {
+                "first": 1,
+                "second": 2,
+                "third": 3
+            }
+            ';
+
+        $output = Json::decodeAssoc($input);
+
+        $this->assertIsArray($output);
+
+        $expectedOutput = [
+            'first' => 1,
+            'second' => 2,
+            'third' => 3,
+        ];
+
+        $this->assertEquals($expectedOutput, $output);
+    }
 }