Add tests for promise resolution and rejection value forwarding

Author: jsor

tests/React/Promise/DeferredRejectTest.php

@@ -63,4 +63,26 @@ public function shouldInvokeNewlyAddedErrbackWhenAlreadyRejected()
             ->promise()
             ->then($this->expectCallableNever(), $mock);
     }
+
+    /** @test */
+    public function shouldForwardReasonWhenCallbackIsNull()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $d = new Deferred();
+        $d
+            ->then(
+                $this->expectCallableNever()
+            )
+            ->then(
+                $this->expectCallableNever(),
+                $mock
+            );
+
+        $d->reject(1);
+    }
 }

tests/React/Promise/DeferredResolveTest.php

@@ -139,4 +139,27 @@ public function shouldInvokeNewlyAddedCallbackWhenAlreadyResolved()
             ->promise()
             ->then($mock, $this->expectCallableNever());
     }
+
+    /** @test */
+    public function shouldForwardValueWhenCallbackIsNull()
+    {
+        $mock = $this->createCallableMock();
+        $mock
+            ->expects($this->once())
+            ->method('__invoke')
+            ->with($this->identicalTo(1));
+
+        $d = new Deferred();
+        $d
+            ->then(
+                null,
+                $this->expectCallableNever()
+            )
+            ->then(
+                $mock,
+                $this->expectCallableNever()
+            );
+
+        $d->resolve(1);
+    }
 }