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TestFoundation: Add infrastructure to assert that a test should crash #2270

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Merged
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May 15, 2019
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TestFoundation: Add infrastructure to assert that a test should crash #2270

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35 changes: 35 additions & 0 deletions TestFoundation/Utilities.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -521,3 +521,38 @@ func testExpectedToFail<T>(_ test: @escaping (T) -> () throws -> Void, _ reason
return { _ in return { } }
}
}

extension XCTest {
func assertCrashes(within block: () throws -> Void) rethrows {
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@airspeedswift This might interest you.

let childProcessEnvVariable = "NS_FOUNDATION_TEST_PERFORM_ASSERT_CRASHES_BLOCKS"
let childProcessEnvVariableOnValue = "YES"

let isChildProcess = ProcessInfo.processInfo.environment[childProcessEnvVariable] == childProcessEnvVariableOnValue

if isChildProcess {
try block()
} else {
var arguments = ProcessInfo.processInfo.arguments
let process = Process()
process.executableURL = URL(fileURLWithPath: arguments[0])

arguments.remove(at: 0)
arguments.removeAll(where: { $0.hasPrefix("TestFoundation.") })
arguments.append("TestFoundation." + self.name.replacingOccurrences(of: ".", with: "/"))
process.arguments = arguments

var environment = ProcessInfo.processInfo.environment
environment[childProcessEnvVariable] = childProcessEnvVariableOnValue
process.environment = environment

do {
try process.run()
process.waitUntilExit()
XCTAssertEqual(process.terminationReason, .uncaughtSignal, "Child process should have crashed: \(process)")
} catch {
XCTFail("Couldn't start child process for testing crash: \(process) - \(error)")
}

}
}
}