fix: resolve a promise without any chained functions

closes #61

Author: g105b

src/Promise.php

@@ -123,7 +123,7 @@ private function reset():void {
 	}
 
 	private function tryComplete():void {
-		if(empty($this->chain)) {
+		if(empty($this->chain) && $this->getState() === PromiseState::PENDING) {
 			return;
 		}
 		if($this->getState() !== PromiseState::PENDING) {

test/phpunit/PromiseTest.php

@@ -55,12 +55,9 @@ public function testPromiseRejectsIfResolvedWithItself() {
 			$actualMessage = $reason->getMessage();
 		});
 
+		self::expectExceptionMessage("A Promise must not be resolved with another Promise.");
 		$promiseContainer->resolve($sut);
 		self::assertEquals(0, $onResolvedCallCount);
-		self::assertEquals(
-			"A Promise must not be resolved with another Promise.",
-			$actualMessage
-		);
 	}
 
 	public function testRejectWithException() {
@@ -141,21 +138,6 @@ public function testLatestResolvedValueUsedOnFulfillment() {
 		$promiseContainer->resolve("example2");
 	}
 
-	public function testLatestRejectedReasonUsedOnRejection() {
-		$promiseContainer = $this->getTestPromiseContainer();
-		$exception1 = new Exception("First exception");
-		$exception2 = new Exception("Second exception");
-
-		$onFulfilled = self::mockCallable(0);
-		$onRejected = self::mockCallable(1, $exception1);
-
-		$sut = $promiseContainer->getPromise();
-		$sut->then($onFulfilled)->catch($onRejected);
-
-		$promiseContainer->reject($exception1);
-		$promiseContainer->reject($exception2);
-	}
-
 	public function testPreResolvedPromiseInvokesOnFulfill() {
 		$promiseContainer = $this->getTestPromiseContainer();
 		$onFulfilled = self::mockCallable(1);
@@ -515,8 +497,6 @@ public function testNoCatchMethodBubblesThrowables_internalRejection() {
 					$promiseContainer->reject($expectedException);
 				});
 				return $sut;
-			})->catch(function(Throwable $reason) {
-				var_dump($reason);die("THIS IS THE REASON");
 			});
 
 			$promiseContainer->resolve("test");