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adding BeginWithPrefix matcher for sequence prefixes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| /// A Nimble matcher that succeeds when the exepected sequence is a prefix of the actual sequence. | ||
| /// | ||
| /// This is a matcher abstraction for https://developer.apple.com/documentation/swift/sequence/2854218-starts | ||
| public func beginWith<Seq1: Sequence, Seq2: Sequence>(prefix expectedPrefix: Seq2?) | ||
| -> Predicate<Seq1> where Seq1.Element: Equatable, Seq1.Element == Seq2.Element { | ||
| return Predicate.define("begin with <\(stringify(expectedPrefix))>") { (actualExpression, msg) in | ||
| let actualPrefix = try actualExpression.evaluate() | ||
| switch (expectedPrefix, actualPrefix) { | ||
| case (nil, _?): | ||
| return PredicateResult(status: .fail, message: msg.appendedBeNilHint()) | ||
| case (nil, nil), (_, nil): | ||
| return PredicateResult(status: .fail, message: msg) | ||
| case (let expected?, let actual?): | ||
| let matches = actual.starts(with: expected) | ||
| return PredicateResult(bool: matches, message: msg) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// A Nimble matcher that succeeds when the expected sequence is the prefix of the actual sequence, using the given predicate as the equivalence test. | ||
| /// | ||
| /// This is a matcher abstraction for https://developer.apple.com/documentation/swift/sequence/2996828-starts | ||
| public func beginWith<Seq1: Sequence, Seq2: Sequence>( | ||
| prefix expectedPrefix: Seq2?, | ||
| by areEquivalent: @escaping (Seq1.Element, Seq2.Element) -> Bool | ||
| ) -> Predicate<Seq1> { | ||
| return Predicate.define("begin with <\(stringify(expectedPrefix))>") { (actualExpression, msg) in | ||
| let actualPrefix = try actualExpression.evaluate() | ||
| switch (expectedPrefix, actualPrefix) { | ||
| case (nil, _?): | ||
| return PredicateResult(status: .fail, message: msg.appendedBeNilHint()) | ||
| case (nil, nil), (_, nil): | ||
| return PredicateResult(status: .fail, message: msg) | ||
| case (let expected?, let actual?): | ||
| let matches = actual.starts(with: expected, by: areEquivalent) | ||
| return PredicateResult(bool: matches, message: msg) | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import Foundation | ||
| import Nimble | ||
| import XCTest | ||
|
|
||
| final class BeginWithPrefixTest: XCTestCase { | ||
|
|
||
| func testBeginWithSequencePrefix() { | ||
| failsWithErrorMessageForNil("expected to begin with <nil>, got <nil>") { | ||
| expect(nil as [Int]?).to(beginWith(prefix: nil as [Int]?)) | ||
| } | ||
|
|
||
| failsWithErrorMessageForNil("expected to begin with <[1, 2]>, got <nil>") { | ||
| expect(nil as [Int]?).to(beginWith(prefix: [1, 2])) | ||
| } | ||
|
|
||
| failsWithErrorMessageForNil("expected to begin with <nil>, got <[1, 2]>") { | ||
| expect([1, 2]).to(beginWith(prefix: nil as [Int]?)) | ||
| } | ||
|
|
||
| let sequence = [1, 2, 3] | ||
| expect(sequence).toNot(beginWith(prefix: [1, 2, 3, 4])) | ||
| expect(sequence).toNot(beginWith(prefix: [2, 3])) | ||
|
|
||
| expect(sequence).to(beginWith(prefix: [1, 2, 3])) | ||
| expect(sequence).to(beginWith(prefix: [1, 2])) | ||
| expect(sequence).to(beginWith(prefix: [])) | ||
|
|
||
| expect([]).toNot(beginWith(prefix: [1])) | ||
| expect([]).to(beginWith(prefix: [] as [Int])) | ||
| } | ||
|
|
||
| func testBeginWithSequencePrefixUsingPredicateClosure() { | ||
| failsWithErrorMessageForNil("expected to begin with <nil>, got <nil>") { | ||
| expect(nil as [Int]?).to(beginWith(prefix: nil as [Int]?, by: { $0 == $1 })) | ||
| } | ||
|
|
||
| failsWithErrorMessageForNil("expected to begin with <[1, 2]>, got <nil>") { | ||
| expect(nil as [Int]?).to(beginWith(prefix: [1, 2], by: { $0 == $1 })) | ||
| } | ||
|
|
||
| failsWithErrorMessageForNil("expected to begin with <nil>, got <[1, 2]>") { | ||
| expect([1, 2]).to(beginWith(prefix: nil as [Int]?, by: { $0 == $1 })) | ||
| } | ||
|
|
||
| let sequence = [1, 2, 3] | ||
| expect(sequence).toNot(beginWith(prefix: [1, 2, 3, 4], by: { $0 == $1 })) | ||
| expect(sequence).toNot(beginWith(prefix: [2, 3], by: { $0 == $1 })) | ||
|
|
||
| expect(sequence).to(beginWith(prefix: [1, 2, 3], by: { $0 == $1 })) | ||
| expect(sequence).to(beginWith(prefix: [1, 2], by: { $0 == $1 })) | ||
| expect(sequence).to(beginWith(prefix: [], by: { $0 == $1 })) | ||
|
|
||
| expect([]).toNot(beginWith(prefix: [1], by: { $0 == $1 })) | ||
| expect([]).to(beginWith(prefix: [] as [Int], by: { $0 == $1 })) | ||
| } | ||
|
|
||
| func testBeginWithSequencePrefixWithDifferentSequenceTypes() { | ||
| expect(1...3).to(beginWith(prefix: [1, 2, 3])) | ||
| expect(1...3).toNot(beginWith(prefix: [1, 2, 3, 4, 5])) | ||
|
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| expect(1...3).to(beginWith(prefix: [1, 2, 3], by: { $0 == $1 })) | ||
| expect(1...3).toNot(beginWith(prefix: [1, 2, 3, 4, 5], by: { $0 == $1 })) | ||
| } | ||
| } |