@isTest
private class RefreshTokenKeepAliveTest {

    private class TokenRefreshMock implements HttpCalloutMock {
        Integer status;
        String body;
        TokenRefreshMock(Integer status, String body) {
            this.status = status;
            this.body = body;
        }
        public HTTPResponse respond(HTTPRequest req) {
            HttpResponse res = new HttpResponse();
            res.setHeader('Content-Type', 'application/json');
            res.setBody(body);
            res.setStatusCode(status);
            return res;
        }
    }

    private static HIC_ShopifySync__Configuration__c seedConfig() {
        HIC_ShopifySync__Configuration__c c = new HIC_ShopifySync__Configuration__c(
            Name = 'Default',
            HIC_ShopifySync__ClientId__c = 'test_client_id',
            HIC_ShopifySync__ClientSecret__c = 'test_client_secret',
            HIC_ShopifySync__Access_Token__c = 'old_access',
            HIC_ShopifySync__Refresh_Token__c = 'old_refresh'
        );
        insert c;
        return c;
    }

    @isTest
    static void execute_doesNotThrow() {
        seedConfig();
        Test.setMock(HttpCalloutMock.class, new TokenRefreshMock(200,
            '{"access_token":"new_access","refresh_token":"new_refresh"}'));
        Test.startTest();
        new RefreshTokenKeepAlive().execute(null);
        Test.stopTest();
    }

    @isTest
    static void refreshNow_withNoConfig_doesNothing() {
        Test.startTest();
        RefreshTokenKeepAlive.refreshNow();
        Test.stopTest();
    }

    @isTest
    static void refreshNow_withBlankRefreshToken_doesNothing() {
        HIC_ShopifySync__Configuration__c c = new HIC_ShopifySync__Configuration__c(
            Name = 'Default',
            HIC_ShopifySync__ClientId__c = 'cid',
            HIC_ShopifySync__ClientSecret__c = 'csec'
        );
        insert c;
        Test.startTest();
        RefreshTokenKeepAlive.refreshNow();
        Test.stopTest();
        HIC_ShopifySync__Configuration__c after = [SELECT HIC_ShopifySync__Refresh_Token__c FROM HIC_ShopifySync__Configuration__c WHERE Name = 'Default'];
        System.assertEquals(null, after.HIC_ShopifySync__Refresh_Token__c);
    }

}