Make sure variadic parameter does not have default value

src/Generator/ParameterGenerator.php

@@ -207,6 +207,10 @@ public function getName()
      */
     public function setDefaultValue($defaultValue)
     {
+        if ($this->variadic) {
+            throw new Exception\InvalidArgumentException('Variadic parameter cannot have a default value');
+        }
+
         if (! $defaultValue instanceof ValueGenerator) {
             $defaultValue = new ValueGenerator($defaultValue);
         }
@@ -265,6 +269,10 @@ public function setPassedByReference($passedByReference)
      */
     public function setVariadic($variadic)
     {
+        if (isset($this->defaultValue)) {
+            throw new Exception\InvalidArgumentException('Variadic parameter cannot have a default value');
+        }
+
         $this->variadic = (bool) $variadic;
 
         return $this;

test/Generator/ParameterGeneratorTest.php

@@ -9,6 +9,7 @@
 namespace LaminasTest\Code\Generator;
 
 use Closure;
+use Laminas\Code\Generator\Exception\InvalidArgumentException;
 use Laminas\Code\Generator\ParameterGenerator;
 use Laminas\Code\Generator\ValueGenerator;
 use Laminas\Code\Reflection\ClassReflection;
@@ -516,7 +517,7 @@ public function testVariadicArgumentFromReflection(
         $methodName,
         $parameterName,
         $expectedGeneratedSignature
-    ) {
+    ): void {
         $parameter = ParameterGenerator::fromReflection(new ParameterReflection(
             [$className, $methodName],
             $parameterName
@@ -576,6 +577,37 @@ public function testSetGetVariadic()
         self::assertSame('$foo', $parameter->generate());
     }
 
+    public function testAssigningDefaultValueToVariadicParameterThrowsInvalidArgumentException(): void
+    {
+        $parameter = new ParameterGenerator();
+
+        $parameter->setName('parameter');
+        $parameter->setType('int');
+        $parameter->setPosition(1);
+        $parameter->setVariadic(true);
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Variadic parameter cannot have a default value');
+
+        $parameter->setDefaultValue([]);
+    }
+
+    public function testMakingParameterVariadicWithExistingDefaultValueThrowsInvalidArgumentException(): void
+    {
+        $parameter = new ParameterGenerator();
+
+        $parameter->setName('parameter');
+        $parameter->setType('int');
+        $parameter->setPosition(1);
+
+        $parameter->setDefaultValue([]);
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Variadic parameter cannot have a default value');
+
+        $parameter->setVariadic(true);
+    }
+
     /**
      * @group zendframework/zend-code#29
      */