How to use testNegativeMatches method of BeginWithTest class

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BeginWithTest.swift

Source: BeginWithTest.swift Github

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1import Foundation
2import XCTest
3import Nimble
4
5final class BeginWithTest: XCTestCase, XCTestCaseProvider {
6    static var allTests: [(String, (BeginWithTest) -> () throws -> Void)] {
7        return [
8            ("testPositiveMatches", testPositiveMatches),
9            ("testNegativeMatches", testNegativeMatches),
10        ]
11    }
12
13    func testPositiveMatches() {
14        expect([1, 2, 3]).to(beginWith(1))
15        expect([1, 2, 3]).toNot(beginWith(2))
16
17        expect("foobar").to(beginWith("foo"))
18        expect("foobar").toNot(beginWith("oo"))
19
20        expect("foobarfoo").to(beginWith("foo"))
21
22        expect(NSString(string: "foobar").description).to(beginWith("foo"))
23        expect(NSString(string: "foobar").description).toNot(beginWith("oo"))
24
25#if _runtime(_ObjC)
26        expect(NSArray(array: ["a", "b"])).to(beginWith("a"))
27        expect(NSArray(array: ["a", "b"])).toNot(beginWith("b"))
28#endif
29    }
30
31    func testNegativeMatches() {
32        failsWithErrorMessageForNil("expected to begin with <b>, got <nil>") {
33            expect(nil as NSArray?).to(beginWith(NSString(string: "b")))
34        }
35        failsWithErrorMessageForNil("expected to not begin with <b>, got <nil>") {
36            expect(nil as NSArray?).toNot(beginWith(NSString(string: "b")))
37        }
38
39        failsWithErrorMessage("expected to begin with <2>, got <[1, 2, 3]>") {
40            expect([1, 2, 3]).to(beginWith(2))
41        }
42        failsWithErrorMessage("expected to not begin with <1>, got <[1, 2, 3]>") {
43            expect([1, 2, 3]).toNot(beginWith(1))
44        }
45        failsWithErrorMessage("expected to begin with <atm>, got <batman>") {
46            expect("batman").to(beginWith("atm"))
47        }
48        failsWithErrorMessage("expected to not begin with <bat>, got <batman>") {
49            expect("batman").toNot(beginWith("bat"))
50        }
51    }
52
53}
54
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