Unit test fixes

Author: ssigwart

src/Analyser/MutatingScope.php

@@ -5701,7 +5701,7 @@ public function getConstantReflection(Type $typeWithConstant, string $constantNa
 		return $typeWithConstant->getConstant($constantName);
 	}
 
-	public function getConstantExplicitTypeFromConfig(string $constantName, Type $constantType): ?Type
+	public function getConstantExplicitTypeFromConfig(string $constantName, Type $constantType): Type
 	{
 		return $this->constantResolver->resolveConstantType($constantName, $constantType);
 	}

src/Analyser/Scope.php

@@ -80,7 +80,7 @@ public function getMethodReflection(Type $typeWithMethod, string $methodName): ?
 
 	public function getConstantReflection(Type $typeWithConstant, string $constantName): ?ClassConstantReflection;
 
-	public function getConstantExplicitTypeFromConfig(string $constantName, Type $constantType): ?Type;
+	public function getConstantExplicitTypeFromConfig(string $constantName, Type $constantType): Type;
 
 	public function getIterableKeyType(Type $iteratee): Type;
 

src/Type/Php/DefineConstantTypeSpecifyingExtension.php

@@ -50,9 +50,10 @@ public function specifyTypes(
 			return new SpecifiedTypes([], []);
 		}
 
-		$finalType = $scope->getConstantExplicitTypeFromConfig(
+		$valueType = $scope->getType($node->getArgs()[1]->value);
+		$finalType = ($valueType === null) ? null : $scope->getConstantExplicitTypeFromConfig(
 			$constantName->getValue(),
-			$scope->getType($node->getArgs()[1]->value),
+			$valueType,
 		);
 
 		return $this->typeSpecifier->create(