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import XCTest
final class ViewDerivedDataTests: XCTestCase {
func testGenericListViewDerivedCollectionsAreReferencedOncePerRenderPass() throws {
let source = try loadSource(at: "Sora/Views/Generic/GenericListView.swift")
let normalizedSource = strippingCommentsAndStrings(from: source)
let filteredItemsUsages = referenceCount(
for: "filteredItems",
in: normalizedSource
)
let sortedFilteredItemsUsages = referenceCount(
for: "sortedFilteredItems",
in: normalizedSource
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
filteredItemsUsages,
1,
"filteredItems should be consumed once per dependency change."
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
sortedFilteredItemsUsages,
1,
"sortedFilteredItems should be consumed once per dependency change."
)
}
func testPostGridViewDerivedCollectionsAreReferencedOncePerRenderPass() throws {
let source = try loadSource(at: "Sora/Views/Post/Grid/PostGridView.swift")
let normalizedSource = strippingCommentsAndStrings(from: source)
let activePostsUsages = referenceCount(
for: "activePosts",
in: normalizedSource
)
let getColumnsDataUsages = invocationCount(
forFunction: "getColumnsData",
in: normalizedSource
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
activePostsUsages,
1,
"activePosts-derived data should be consumed once per dependency change."
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
getColumnsDataUsages,
1,
"getColumnsData should be invoked once per dependency change."
)
}
func testFavoritesViewDerivedCollectionsAreReferencedOncePerRenderPass() throws {
let source = try loadSource(at: "Sora/Views/FavoritesView.swift")
let normalizedSource = strippingCommentsAndStrings(from: source)
let filteredFavoritesUsages = referenceCount(
for: "filteredFavorites",
in: normalizedSource
)
let sortedFilteredFavoritesUsages = referenceCount(
for: "sortedFilteredFavorites",
in: normalizedSource
)
let inlinePostMappingCount = tokenCount(
matching: #"\bsortedFilteredFavorites\s*\.\s*map\s*\{"#,
in: normalizedSource
)
let columnsSplitterUsages = invocationCount(
forFunction: "getColumnsData",
in: normalizedSource
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
filteredFavoritesUsages,
1,
"filteredFavorites should be consumed once per dependency change."
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
sortedFilteredFavoritesUsages,
1,
"sortedFilteredFavorites should be consumed once per dependency change."
)
// swiftlint:disable:next prefer_nimble
XCTAssertEqual(
inlinePostMappingCount,
0,
"Favorites grid should not remap sorted favorites to posts inline on each cell render."
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
columnsSplitterUsages,
1,
"Favorites grid column distribution should be derived once per dependency change."
)
}
private func referenceCount(for symbol: String, in source: String) -> Int {
let totalMatches = tokenCount(
matching: #"\b\#(symbol)\b"#,
in: source
)
let declarationMatches = tokenCount(
matching: #"\b(?:var|let)\s+\#(symbol)\b"#,
in: source
)
return max(0, totalMatches - declarationMatches)
}
private func invocationCount(forFunction name: String, in source: String) -> Int {
let totalMatches = tokenCount(
matching: #"\b\#(name)\s*\("#,
in: source
)
let declarationMatches = tokenCount(
matching: #"\bfunc\s+\#(name)\s*\("#,
in: source
)
return max(0, totalMatches - declarationMatches)
}
}
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