diff --git a/tests/phpunit/tests/API_Rewrite/APIRewrite_ConstructTest.php b/tests/phpunit/tests/API_Rewrite/APIRewrite_ConstructTest.php
new file mode 100644
index 0000000..bd31176
--- /dev/null
+++ b/tests/phpunit/tests/API_Rewrite/APIRewrite_ConstructTest.php
@@ -0,0 +1,109 @@
+<?php
+/**
+ * Class APIRewrite_ConstructTest
+ *
+ * @package AspireUpdate
+ */
+
+/**
+ * Tests for API_Rewrite::__construct()
+ *
+ * @covers \AspireUpdate\API_Rewrite::__construct
+ */
+class APIRewrite_ConstructTest extends WP_UnitTestCase {
+	/**
+	 * Test that hooks are added.
+	 *
+	 * @dataProvider data_hooks_and_methods
+	 *
+	 * @string $hook   The hook's name.
+	 * @string $method The method to hook.
+	 */
+	public function test_should_add_hooks( $hook, $method ) {
+		$api_rewrite = new AspireUpdate\API_Rewrite( 'debug', false );
+		$this->assertIsInt( has_action( $hook, [ $api_rewrite, $method ] ) );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array[]
+	 */
+	public function data_hooks_and_methods() {
+		return [
+			'pre_http_request -> pre_http_request' => [
+				'hook'   => 'pre_http_request',
+				'method' => 'pre_http_request',
+			],
+		];
+	}
+
+	/**
+	 * Test that properties are set to the expected value.
+	 *
+	 * @dataProvider data_properties_and_values
+	 *
+	 * @param string $property_name  The property's name.
+	 * @param string $passed_value   The value passed to the constructor.
+	 * @param string $expected_value The expected stored value after processing.
+	 */
+	public function test_should_set_properties( $property_name, $passed_value, $expected_value ) {
+		$api_rewrite = new AspireUpdate\API_Rewrite(
+			'redirected_host' === $property_name ? $passed_value : 'debug',
+			'disable_ssl' === $property_name ? $passed_value : false
+		);
+
+		if ( '%DEFAULT_HOST%' === $expected_value ) {
+			static $default_host_value;
+
+			if ( ! $default_host_value ) {
+				$api_rewrite_reflection = new ReflectionClass( 'AspireUpdate\API_Rewrite' );
+				$default_host_value     = $api_rewrite_reflection->getDefaultProperties()['default_host'];
+			}
+
+			$expected_value = $default_host_value;
+		}
+
+		$property = new ReflectionProperty( $api_rewrite, $property_name );
+		$property->setAccessible( true );
+		$actual_value = $property->getValue( $api_rewrite );
+		$property->setAccessible( false );
+
+		$this->assertSame( $expected_value, $actual_value );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array[]
+	 */
+	public function data_properties_and_values() {
+		return [
+			'redirected_host as "debug" (should be the default host)' => [
+				'property_name'  => 'redirected_host',
+				'passed_value'   => 'debug',
+				'expected_value' => '%DEFAULT_HOST%',
+			],
+			'redirected_host in mixed case (should convert to lowercase)' => [
+				'property_name'  => 'redirected_host',
+				'passed_value'   => 'mY.aPi.OrG',
+				'expected_value' => 'my.api.org',
+			],
+			'malformed redirected_host (should be stored as-is)' => [
+				'property_name'  => 'redirected_host',
+				'passed_value'   => 'my#api..org/https://',
+				'expected_value' => 'my#api..org/https://',
+			],
+			'disable_ssl as (bool) true'  => [
+				'property_name'  => 'disable_ssl',
+				'passed_value'   => true,
+				'expected_value' => true,
+			],
+			'disable_ssl as (bool) false' => [
+				'property_name'  => 'disable_ssl',
+				'passed_value'   => false,
+				'expected_value' => false,
+			],
+		];
+	}
+}