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83 lines
4.0 KiB
83 lines
4.0 KiB
import Foundation
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import Testing
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@testable import Music
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// Verifies the pure single/multi-track edit logic: extraction, change detection,
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// shared-vs-mixed across many tracks, and applying only edited fields.
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struct EditableTrackFieldsTests {
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@Test func initCopiesEditableValues() {
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// Step 1: build fields from a fixture track.
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let t = Track.fixture(title: "A", artist: "B", album: "C", year: 2001, rating: 3)
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let f = EditableTrackFields(from: t)
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// Step 2: editable values match.
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#expect(f.title == "A"); #expect(f.artist == "B")
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#expect(f.album == "C"); #expect(f.year == 2001); #expect(f.rating == 3)
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}
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@Test func changedFieldsDetectsOnlyDifferences() {
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// Step 1: two field sets differing only in genre + bpm.
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let a = EditableTrackFields(from: .fixture(genre: "Rock", bpm: 120))
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var b = a; b.genre = "Jazz"; b.bpm = 90
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// Step 2: change set is exactly {genre, bpm}.
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#expect(a.changedFields(to: b) == [.genre, .bpm])
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}
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@Test func sharedMarksDifferingFieldsMixed() {
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// Step 1: two tracks share artist but differ in genre.
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let t1 = Track.fixture(artist: "Same", genre: "Rock")
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let t2 = Track.fixture(artist: "Same", genre: "Pop")
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// Step 2: shared() returns common artist and flags genre as mixed.
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let (values, mixed) = EditableTrackFields.shared(across: [t1, t2])
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#expect(values.artist == "Same")
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#expect(mixed.contains(.genre))
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#expect(!mixed.contains(.artist))
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}
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@Test func sharedAcrossThreeTracksAccumulatesMixed() {
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// Step 1: three tracks all share the same album, but title differs on the
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// third track and genre differs on the second — so both title and
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// genre must end up "mixed", while album stays shared.
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let t1 = Track.fixture(title: "Same", album: "One Album", genre: "Rock")
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let t2 = Track.fixture(title: "Same", album: "One Album", genre: "Pop")
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let t3 = Track.fixture(title: "Different", album: "One Album", genre: "Rock")
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// Step 2: shared() over all three.
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let (values, mixed) = EditableTrackFields.shared(across: [t1, t2, t3])
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// Step 3: album is shared (not mixed); title + genre are mixed.
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#expect(values.album == "One Album")
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#expect(!mixed.contains(.album))
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#expect(mixed.contains(.title))
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#expect(mixed.contains(.genre))
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}
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@Test func applyOnlyWritesEditedFields() {
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// Step 1: a track and a fields object that changes album only.
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let t = Track.fixture(album: "Old", genre: "Rock")
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var f = EditableTrackFields(from: t); f.album = "New"; f.genre = "IGNORED"
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// Step 2: applying with editing={.album} changes album, leaves genre.
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let out = f.apply(editing: [.album], to: t)
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#expect(out.album == "New")
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#expect(out.genre == "Rock")
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}
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@Test func applyEmptyEditSetReturnsUnchanged() {
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let t = Track.fixture(title: "Keep")
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let f = EditableTrackFields(from: t)
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#expect(f.apply(editing: [], to: t) == t)
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}
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@Test func sharedAcrossThreeTracksAccumulatesMixed() {
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// Step 1: three tracks all share the same album, but title differs on the
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// third track and genre differs on the second — so both title and
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// genre must end up "mixed", while album stays shared.
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let t1 = Track.fixture(title: "Same", album: "One Album", genre: "Rock")
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let t2 = Track.fixture(title: "Same", album: "One Album", genre: "Pop")
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let t3 = Track.fixture(title: "Different", album: "One Album", genre: "Rock")
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// Step 2: shared() over all three.
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let (values, mixed) = EditableTrackFields.shared(across: [t1, t2, t3])
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// Step 3: album is shared (not mixed); title + genre are mixed.
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#expect(values.album == "One Album")
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#expect(!mixed.contains(.album))
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#expect(mixed.contains(.title))
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#expect(mixed.contains(.genre))
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}
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}
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