import Foundationimport Testing@testable import CodexBarCore struct GrokBillingResponseTests {    @Test    func `decodes full BillingConfigResponse and computes percent`() throws {        let json = #"""        {          "billingCycle": {            "billingPeriodStart": "2026-05-01T00:00:00Z",            "billingPeriodEnd": "2026-06-01T00:00:00Z"          },          "monthlyLimit": { "val": 99900 },          "onDemandCap": { "val": 0 },          "on_demand_enabled": false,          "disabledByConfig": false,          "usage": {            "includedUsed": { "val": 49950 },            "onDemandUsed": { "val": 0 },            "totalUsed": { "val": 49950 }          }        }        """#        let data = Data(json.utf8)        let response = try JSONDecoder().decode(GrokBillingResponse.self, from: data)         #expect(response.monthlyLimit?.val == 99900)        #expect(response.usage?.totalUsed?.val == 49950)        #expect(response.monthlyUsedPercent == 50.0)        #expect(response.billingPeriodEndDate != nil)        #expect(response.billingPeriodMinutes == 31 * 24 * 60)    }     @Test    func `monthlyUsedPercent returns nil when limit missing`() throws {        let json = #"""        {          "usage": { "totalUsed": { "val": 100 } }        }        """#        let data = Data(json.utf8)        let response = try JSONDecoder().decode(GrokBillingResponse.self, from: data)        #expect(response.monthlyUsedPercent == nil)    }     @Test    func `monthlyUsedPercent clamps over-100 usage`() throws {        let json = #"""        {          "monthlyLimit": { "val": 1000 },          "usage": { "totalUsed": { "val": 5000 } }        }        """#        let data = Data(json.utf8)        let response = try JSONDecoder().decode(GrokBillingResponse.self, from: data)        #expect(response.monthlyUsedPercent == 100.0)    }     @Test    func `handles missing optional fields gracefully`() throws {        let json = #"{}"#        let data = Data(json.utf8)        let response = try JSONDecoder().decode(GrokBillingResponse.self, from: data)        #expect(response.billingCycle == nil)        #expect(response.monthlyLimit == nil)        #expect(response.monthlyUsedPercent == nil)    }}