@testable import PureYAML
import Testing

/// A flow mapping entry may omit its `:` value indicator, in which case the key maps to null: `{ a }`
/// and `{ a, b }` are flow sets. Entries with and without values mix freely, and a key without a value
/// may itself span lines (`{ multi`/`line, a: b}`).
@Suite("Flow mapping no value")
struct FlowMappingNoValueTests {
    @Test("A single key with no value maps to null")
    func test_singleKey() throws {
        #expect(try PureYAML.parse("{ a }\n") == .mapping(.init([
            .init(key: "a", value: .null),
        ])))
    }

    @Test("Several keys with no value form a set")
    func test_set() throws {
        #expect(try PureYAML.parse("{ a, b }\n") == .mapping(.init([
            .init(key: "a", value: .null),
            .init(key: "b", value: .null),
        ])))
    }

    @Test("Valued and valueless entries mix")
    func test_mixed() throws {
        #expect(try PureYAML.parse("{ a: 1, b }\n") == .mapping(.init([
            .init(key: "a", value: .int(1)),
            .init(key: "b", value: .null),
        ])))
    }

    @Test("A valueless key may span lines")
    func test_multilineValuelessKey() throws {
        #expect(try PureYAML.parse("{ multi\n  line, a: b}\n") == .mapping(.init([
            .init(key: "multi line", value: .null),
            .init(key: "a", value: .string("b")),
        ])))
    }
}