Add the ability for MTKTestable test(_:) blocks to throw

MetovaTestKit/Testable/MTKTestable+UIViewController.swift

@@ -36,10 +36,10 @@ public extension MTKTestable where Self: UIViewController {
 
      - parameter testBlock: The block of tests to run.
      */
-    static func test(_ testBlock: (Self) -> Void) {
+    static func test(_ testBlock: (Self) throws -> Void) rethrows {
         let testVC = instanceForTesting()
         testVC.loadView()
         testVC.viewDidLoad()
-        testBlock(testVC)
+        try testBlock(testVC)
     }
 }

MetovaTestKit/Testable/MTKTestable.swift

@@ -74,7 +74,7 @@ public protocol MTKTestable {
 
      - parameter testBlock: A block of code containing tests to run.
      */
-    static func test(_ testBlock: (TestableItem) -> Void)
+    static func test(_ testBlock: (TestableItem) throws -> Void) rethrows
 
     /**
      Asks the `MTKTestable` type for a new instance in order to be used for testing. This method should provide a new instance every time.

MetovaTestKitTests/Test Data/TestableViewController.swift

@@ -55,6 +55,16 @@ class TestableViewController: UIViewController {
         testLabel.text = TestableViewController.TestLabelString
         testButton.setTitle(TestableViewController.TestButtonString, for: .normal)
     }
+
+    func throwError() throws {
+
+        throw ViewControllerError()
+    }
+}
+
+extension TestableViewController {
+
+    struct ViewControllerError: Error { }
 }
 
 // Implementing this method and marking conformance to MTKTestable protocol means we inherit the default implementation of the test(_:) method defined in the extension for the protocol for UIViewControllers.

MetovaTestKitTests/Testable Protocol Tests/TestableProtocolTests.swift

@@ -59,4 +59,15 @@ class TestableProtocolTests: MTKBaseTestCase {
 
         waitForExpectations(timeout: 0, handler: nil)
     }
+
+    func testErrorIsThrown() {
+
+        XCTAssertThrowsError(
+
+            try TestableViewController.test { testVC in
+
+                try testVC.throwError()
+            }
+        )
+    }
 }