Add unit test coverage for AUTO_SIZES_CONSTRAINTS

Author: mukeshpanchal27

plugins/auto-sizes/tests/test-improve-calculate-sizes.php

@@ -52,6 +52,34 @@ public function set_up(): void {
 		wp_clean_theme_json_cache();
 	}
 
+	/**
+	 * Test that AUTO_SIZES_CONSTRAINTS contains all expected keys.
+	 */
+	public function test_auto_sizes_constraints_keys_exist(): void {
+		$expected_keys = array( 'full', 'wide', 'left', 'right', 'default', 'center' );
+		$constraints   = defined( 'AUTO_SIZES_CONSTRAINTS' ) ? constant( 'AUTO_SIZES_CONSTRAINTS' ) : $GLOBALS['AUTO_SIZES_CONSTRAINTS'];
+		$this->assertIsArray( $constraints );
+		foreach ( $expected_keys as $key ) {
+			$this->assertArrayHasKey( $key, $constraints, "Key '{$key}' not found in AUTO_SIZES_CONSTRAINTS." );
+		}
+	}
+
+	/**
+	 * Test that AUTO_SIZES_CONSTRAINTS values are as expected.
+	 */
+	public function test_auto_sizes_constraints_values(): void {
+		$expected    = array(
+			'full'    => 0,
+			'wide'    => 1,
+			'left'    => 2,
+			'right'   => 2,
+			'default' => 3,
+			'center'  => 3,
+		);
+		$constraints = defined( 'AUTO_SIZES_CONSTRAINTS' ) ? constant( 'AUTO_SIZES_CONSTRAINTS' ) : $GLOBALS['AUTO_SIZES_CONSTRAINTS'];
+		$this->assertEquals( $expected, $constraints );
+	}
+
 	/**
 	 * Test that if disable responsive image then it will not add sizes attribute.
 	 */