Add contain matcher for SetAlgebra

Sources/Nimble/Matchers/Contain.swift

@@ -1,13 +1,14 @@
 import Foundation
 
-/// A Nimble matcher that succeeds when the actual sequence contains the expected value.
+/// A Nimble matcher that succeeds when the actual sequence contains the expected values.
 public func contain<S: Sequence, T: Equatable>(_ items: T...) -> Predicate<S>
-    where S.Iterator.Element == T {
+    where S.Element == T {
     return contain(items)
 }
 
+/// A Nimble matcher that succeeds when the actual sequence contains the expected values.
 public func contain<S: Sequence, T: Equatable>(_ items: [T]) -> Predicate<S>
-    where S.Iterator.Element == T {
+    where S.Element == T {
     return Predicate.simple("contain <\(arrayAsString(items))>") { actualExpression in
         if let actual = try actualExpression.evaluate() {
             let matches = items.allSatisfy {
@@ -19,6 +20,26 @@ public func contain<S: Sequence, T: Equatable>(_ items: [T]) -> Predicate<S>
     }
 }
 
+/// A Nimble matcher that succeeds when the actual set contains the expected values.
+public func contain<S: SetAlgebra, T: Equatable>(_ items: T...) -> Predicate<S>
+    where S.Element == T {
+        return contain(items)
+}
+
+/// A Nimble matcher that succeeds when the actual set contains the expected values.
+public func contain<S: SetAlgebra, T: Equatable>(_ items: [T]) -> Predicate<S>
+    where S.Element == T {
+        return Predicate.simple("contain <\(arrayAsString(items))>") { actualExpression in
+            if let actual = try actualExpression.evaluate() {
+                let matches = items.allSatisfy {
+                    return actual.contains($0)
+                }
+                return PredicateStatus(bool: matches)
+            }
+            return .fail
+        }
+}
+
 /// A Nimble matcher that succeeds when the actual string contains the expected substring.
 public func contain(_ substrings: String...) -> Predicate<String> {
     return contain(substrings)

Tests/NimbleTests/Matchers/ContainTest.swift

@@ -3,12 +3,12 @@ import XCTest
 import Nimble
 
 final class ContainTest: XCTestCase, XCTestCaseProvider {
-    func testContain() {
+    func testContainSequence() {
         expect([1, 2, 3]).to(contain(1))
+        expect([1, 2, 3]).toNot(contain(4))
         expect([1, 2, 3] as [CInt]).to(contain(1 as CInt))
         expect([1, 2, 3] as [CInt]).toNot(contain(4 as CInt))
         expect(["foo", "bar", "baz"]).to(contain("baz"))
-        expect([1, 2, 3]).toNot(contain(4))
         expect(["foo", "bar", "baz"]).toNot(contain("ba"))
 #if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
         expect(NSArray(array: ["a"])).to(contain(NSString(string: "a")))
@@ -31,6 +31,25 @@ final class ContainTest: XCTestCase, XCTestCaseProvider {
         }
     }
 
+    func testContainSetAlgebra() {
+        expect([.a, .b, .c] as TestOptionSet).to(contain(.a))
+        expect([.a, .b, .c] as TestOptionSet).toNot(contain(.d))
+
+        failsWithErrorMessage("expected to contain <8>, got <7>") {
+            expect([.a, .b, .c] as TestOptionSet).to(contain(.d))
+        }
+        failsWithErrorMessage("expected to not contain <2>, got <7>") {
+            expect([.a, .b, .c] as TestOptionSet).toNot(contain(.b))
+        }
+
+        failsWithErrorMessageForNil("expected to contain <1>, got <nil>") {
+            expect(nil as TestOptionSet?).to(contain(.a))
+        }
+        failsWithErrorMessageForNil("expected to not contain <1>, got <nil>") {
+            expect(nil as TestOptionSet?).toNot(contain(.a))
+        }
+    }
+
     func testContainSubstring() {
         expect("foo").to(contain("o"))
         expect("foo").to(contain("oo"))
@@ -83,3 +102,23 @@ final class ContainTest: XCTestCase, XCTestCaseProvider {
         }
     }
 }
+
+private struct TestOptionSet: OptionSet, CustomStringConvertible {
+    let rawValue: Int
+
+    // swiftlint:disable identifier_name
+    static let a = TestOptionSet(rawValue: 1 << 0)
+    static let b = TestOptionSet(rawValue: 1 << 1)
+    static let c = TestOptionSet(rawValue: 1 << 2)
+    static let d = TestOptionSet(rawValue: 1 << 3)
+    static let e = TestOptionSet(rawValue: 1 << 4)
+    // swiftlint:enable identifier_name
+
+    init(rawValue: Int) {
+        self.rawValue = rawValue
+    }
+
+    var description: String {
+        return "\(rawValue)"
+    }
+}

Tests/NimbleTests/XCTestManifests.swift

@@ -200,8 +200,9 @@ extension ContainElementSatisfyingTest {
 extension ContainTest {
     static let __allTests = [
         ("testCollectionArguments", testCollectionArguments),
-        ("testContain", testContain),
         ("testContainObjCSubstring", testContainObjCSubstring),
+        ("testContainSequence", testContainSequence),
+        ("testContainSetAlgebra", testContainSetAlgebra),
         ("testContainSubstring", testContainSubstring),
         ("testVariadicArguments", testVariadicArguments),
     ]