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New matcher: map, for running a function on a value and running a mat…
…cher against the return value of that function (#1112)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| /// `map` works by transforming the expression to a value that the given matcher uses. | ||
| /// | ||
| /// For example, you might only care that a particular property on a method equals some other value. | ||
| /// So, you could write `expect(myObject).to(lens(\.someIntValue, equal(3))`. | ||
| /// This is also useful in conjunction with ``satisfyAllOf`` to do a partial equality of an object. | ||
| public func map<T, U>(_ transform: @escaping (T) throws -> U, _ matcher: Matcher<U>) -> Matcher<T> { | ||
| Matcher { (received: Expression<T>) in | ||
| try matcher.satisfies(received.cast { value in | ||
| guard let value else { return nil } | ||
| return try transform(value) | ||
| }) | ||
| } | ||
| } | ||
|
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||
| /// `map` works by transforming the expression to a value that the given matcher uses. | ||
| /// | ||
| /// For example, you might only care that a particular property on a method equals some other value. | ||
| /// So, you could write `expect(myObject).to(lens(\.someIntValue, equal(3))`. | ||
| /// This is also useful in conjunction with ``satisfyAllOf`` to do a partial equality of an object. | ||
| public func map<T, U>(_ transform: @escaping (T) async throws -> U, _ matcher: some AsyncableMatcher<U>) -> AsyncMatcher<T> { | ||
| AsyncMatcher { (received: AsyncExpression<T>) in | ||
| try await matcher.satisfies(received.cast { value in | ||
| guard let value else { return nil } | ||
| return try await transform(value) | ||
| }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| import XCTest | ||
| import Nimble | ||
| #if SWIFT_PACKAGE | ||
| import NimbleSharedTestHelpers | ||
| #endif | ||
|
|
||
| final class MapTest: XCTestCase { | ||
| func testMap() { | ||
| expect(1).to(map({ $0 }, equal(1))) | ||
|
|
||
| struct Value { | ||
| let int: Int | ||
| let string: String? | ||
| } | ||
|
|
||
| expect(Value( | ||
| int: 1, | ||
| string: "hello" | ||
| )).to(satisfyAllOf( | ||
| map(\.int, equal(1)), | ||
| map(\.string, equal("hello")) | ||
| )) | ||
|
|
||
| expect(Value( | ||
| int: 1, | ||
| string: "hello" | ||
| )).to(satisfyAnyOf( | ||
| map(\.int, equal(2)), | ||
| map(\.string, equal("hello")) | ||
| )) | ||
|
|
||
| expect(Value( | ||
| int: 1, | ||
| string: "hello" | ||
| )).toNot(satisfyAllOf( | ||
| map(\.int, equal(2)), | ||
| map(\.string, equal("hello")) | ||
| )) | ||
| } | ||
|
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| func testMapAsync() async { | ||
| struct Value { | ||
| let int: Int | ||
| let string: String | ||
| } | ||
|
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| await expect(Value( | ||
| int: 1, | ||
| string: "hello" | ||
| )).to(map(\.int, asyncEqual(1))) | ||
|
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| await expect(Value( | ||
| int: 1, | ||
| string: "hello" | ||
| )).toNot(map(\.int, asyncEqual(2))) | ||
| } | ||
|
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| func testMapWithAsyncFunction() async { | ||
| func someOperation(_ value: Int) async -> String { | ||
| "\(value)" | ||
| } | ||
| await expect(1).to(map(someOperation, equal("1"))) | ||
| } | ||
|
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| func testMapWithActor() { | ||
| actor Box { | ||
| let int: Int | ||
| let string: String | ||
|
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| init(int: Int, string: String) { | ||
| self.int = int | ||
| self.string = string | ||
| } | ||
| } | ||
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| let box = Box(int: 3, string: "world") | ||
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| expect(box).to(satisfyAllOf( | ||
| map(\.int, equal(3)), | ||
| map(\.string, equal("world")) | ||
| )) | ||
| } | ||
| } |