menubar-pet/Tests/PetKitTests/PetStateTests.swift

 1import XCTest
 2@testable import PetKit
 3
 4/// The other half of the contract with `pet-life`. Its JSON is pinned to exact
 5/// bytes by a Rust test; this asserts Swift reads those same bytes. The wire
 6/// format between the daemon and the collector drifted twice in this project,
 7/// and both times a pinned fixture is what caught it.
 8final class PetStateTests: XCTestCase {
 9    /// Verbatim from pet-life's own `the_json_contract_is_exact` test.
10    let living = #"""
11    {"alive":true,"name":"Ash","generation":2,"stage":"content","face":"(^ω^)","age_days":0.50,"quiet_days":0.50,"cemetery":[{"name":"Marble","generation":1,"lived_days":7.00}]}
12    """#
13
14    /// A pet that has died: name and generation are null, not absent.
15    let dead = #"""
16    {"alive":false,"name":null,"generation":null,"stage":"dead","face":"†","age_days":0.00,"quiet_days":31.00,"cemetery":[{"name":"Marble","generation":1,"lived_days":7.00}]}
17    """#
18
19    func testDecodesALivingPet() throws {
20        let pet = try PetState.decode(Data(living.utf8))
21        XCTAssertTrue(pet.alive)
22        XCTAssertEqual(pet.name, "Ash")
23        XCTAssertEqual(pet.generation, 2)
24        XCTAssertEqual(pet.stage, "content")
25        XCTAssertEqual(pet.face, "(^ω^)")
26        XCTAssertEqual(pet.age_days, 0.5, accuracy: 0.001)
27        XCTAssertEqual(pet.cemetery.count, 1)
28        XCTAssertEqual(pet.cemetery[0].name, "Marble")
29        XCTAssertEqual(pet.cemetery[0].lived_days, 7.0, accuracy: 0.001)
30    }
31
32    /// The null case is the one a naive `String` rather than `String?` would
33    /// break on, and it is exactly the state the app must render.
34    func testDecodesADeadPet() throws {
35        let pet = try PetState.decode(Data(dead.utf8))
36        XCTAssertFalse(pet.alive)
37        XCTAssertNil(pet.name)
38        XCTAssertNil(pet.generation)
39        XCTAssertEqual(pet.stage, "dead")
40        XCTAssertEqual(pet.cemetery.count, 1, "the dead are still remembered")
41    }
42
43    func testRejectsSomethingThatIsNotAPet() {
44        XCTAssertThrowsError(try PetState.decode(Data(#"{"nope":1}"#.utf8)))
45    }
46}