Make TaskError equatable

Author: younata

ReactiveTask/Errors.swift

@@ -34,3 +34,16 @@ extension TaskError: CustomStringConvertible {
 		}
 	}
 }
+
+extension TaskError: Equatable {}
+
+public func ==(lhs: TaskError, rhs: TaskError) -> Bool {
+	switch (lhs, rhs) {
+	case (.ShellTaskFailed(let lhsTask, let lhsCode, let lhsErr), .ShellTaskFailed(let rhsTask, let rhsCode, let rhsErr)):
+		return lhsTask == rhsTask && lhsCode == rhsCode && lhsErr == rhsErr
+	case (.POSIXError(let lhsCode), .POSIXError(let rhsCode)):
+		return lhsCode == rhsCode
+	default:
+		return false
+	}
+}

ReactiveTaskTests/TaskSpec.swift

@@ -88,6 +88,7 @@ class TaskSpec: QuickSpec {
 
 			expect(result).notTo(beNil())
 			expect(result.error).toNot(beNil())
+			expect(result.error) == TaskError.ShellTaskFailed(task, exitCode: 1, standardError: "stat: not-a-real-file: stat: No such file or directory\n")
 			if let error = result.error {
 				expect(error.description) == "A shell task (/usr/bin/stat not-a-real-file) failed with exit code 1:\nstat: not-a-real-file: stat: No such file or directory\n"
 			}