Merge branch '2.7' into 2.8

* 2.7:
  Refactoring tests.

Author: nicolas-grekas

Tests/ConstraintViolationListTest.php

@@ -89,16 +89,16 @@ public function testArrayAccess()
         $this->list[] = $violation;
 
         $this->assertSame($violation, $this->list[0]);
-        $this->assertTrue(isset($this->list[0]));
+        $this->assertArrayHasKey(0, $this->list);
 
         unset($this->list[0]);
 
-        $this->assertFalse(isset($this->list[0]));
+        $this->assertArrayNotHasKey(0, $this->list);
 
         $this->list[10] = $violation;
 
         $this->assertSame($violation, $this->list[10]);
-        $this->assertTrue(isset($this->list[10]));
+        $this->assertArrayHasKey(10, $this->list);
     }
 
     public function testToString()

Tests/Constraints/GroupSequenceTest.php

@@ -62,15 +62,15 @@ public function testLegacyArrayAccess()
 
         $this->assertSame('Group 1', $sequence[0]);
         $this->assertSame('Group 2', $sequence[1]);
-        $this->assertTrue(isset($sequence[0]));
-        $this->assertFalse(isset($sequence[2]));
+        $this->assertArrayHasKey(0, $sequence);
+        $this->assertArrayNotHasKey(2, $sequence);
         unset($sequence[0]);
-        $this->assertFalse(isset($sequence[0]));
+        $this->assertArrayNotHasKey(0, $sequence);
         $sequence[] = 'Group 3';
-        $this->assertTrue(isset($sequence[2]));
+        $this->assertArrayHasKey(2, $sequence);
         $this->assertSame('Group 3', $sequence[2]);
         $sequence[0] = 'Group 1';
-        $this->assertTrue(isset($sequence[0]));
+        $this->assertArrayHasKey(0, $sequence);
         $this->assertSame('Group 1', $sequence[0]);
     }