Class Iri: add input validation

src/Iri.php

@@ -9,6 +9,7 @@
 namespace WpOrg\Requests;
 
 use WpOrg\Requests\Exception;
+use WpOrg\Requests\Exception\InvalidArgument;
 use WpOrg\Requests\Ipv6;
 use WpOrg\Requests\Port;
 
@@ -247,8 +248,14 @@ public function __unset($name) {
 	 * Create a new IRI object, from a specified string
 	 *
 	 * @param string|null $iri
+	 *
+	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $iri argument is not a string nor null.
 	 */
 	public function __construct($iri = null) {
+		if ($iri !== null && is_string($iri) === false) {
+			throw InvalidArgument::create(1, '$iri', 'string|null', gettype($iri));
+		}
+
 		$this->set_iri($iri);
 	}
 

tests/IriTest.php

@@ -42,7 +42,9 @@
 
 namespace WpOrg\Requests\Tests;
 
+use WpOrg\Requests\Exception\InvalidArgument;
 use WpOrg\Requests\Iri;
+use WpOrg\Requests\Tests\Fixtures\StringableObject;
 use WpOrg\Requests\Tests\TestCase;
 
 final class IriTest extends TestCase
@@ -413,4 +415,35 @@ public function testBadPort()
 
 		$this->assertNull($iri->port);
 	}
+
+	/**
+	 * Tests receiving an exception when an invalid input type is passed to the constructor.
+	 *
+	 * @dataProvider dataConstructorInvalidInput
+	 *
+	 * @covers \WpOrg\Requests\Iri::__construct
+	 *
+	 * @param mixed $iri Invalid input.
+	 *
+	 * @return void
+	 */
+	public function testConstructorInvalidInput($iri) {
+		$this->expectException(InvalidArgument::class);
+		$this->expectExceptionMessage('Argument #1 ($iri) must be of type string|null');
+
+		new Iri($iri);
+	}
+
+	/**
+	 * Data Provider.
+	 *
+	 * @return array
+	 */
+	public function dataConstructorInvalidInput() {
+		return array(
+			'boolean false'     => array(false),
+			'float'             => array(1.1),
+			'stringable object' => array(new StringableObject('value')),
+		);
+	}
 }