@isTest
private class FeatureParameterTest {

    @isTest
    static void testIncrementMethodsAndFlush() {
        // Call all increment methods to populate the internal pending map
        FeatureParameter.incrementOrderCount();
        FeatureParameter.incrementOrderItemCount();

        FeatureParameter.incrementOrderCount(2);
        FeatureParameter.incrementOrderItemCount(5);

        // Execute flush which internally calls @future incrementAsync()
        Test.startTest();
        FeatureParameter.flush();
        Test.stopTest();

        System.assert(true, 'Flush executed successfully after multiple increments.');
    }

    @isTest
    static void testIncrementAsyncWithEmptyMap() {
        // Test when deltas map is empty
        Map<String, Integer> emptyMap = new Map<String, Integer>();

        Test.startTest();
        FeatureParameter.incrementAsync(emptyMap);
        Test.stopTest();

        System.assert(true, 'Handled empty map without error.');
    }

    @isTest
    static void testIncrementAsyncWithValues() {
        // Test direct invocation of @future method with data
        Map<String, Integer> deltas = new Map<String, Integer>{
            'HIC_ShopifySync__Active_Order_Product_Count' => 10,
            'HIC_ShopifySync__Active_Order_Count'  => 2
        };

        Test.startTest();
        FeatureParameter.incrementAsync(deltas);
        Test.stopTest();

        System.assert(true, 'incrementAsync executed successfully with data.');
    }

    @isTest
    static void testFlushWithoutPending() {
        // Ensure flush works fine even if pending is empty
        Test.startTest();
        FeatureParameter.flush();
        Test.stopTest();

        System.assert(true, 'Flush with no pending entries executed successfully.');
    }
}