Update the README to correspond to the new API

Author: briancroom

README.md

@@ -58,14 +58,14 @@ You may add tests for XCTest by including them in the `Tests/Functional/` direct
 
 ### Additional Considerations for Swift on Linux
 
-When running on the Objective-C runtime, XCTest is able to find all of your tests by simply asking the runtime for the subclasses of `XCTestCase`. It then finds the methods that start with the string `test`. This functionality is not currently present when running on the Swift runtime. Therefore, you must currently provide an additional property called `allTests` in your `XCTestCase` subclass. This method lists all of the tests in the test class. The rest of your test case subclass still contains your test methods.
+When running on the Objective-C runtime, XCTest is able to find all of your tests by simply asking the runtime for the subclasses of `XCTestCase`. It then finds the methods that start with the string `test`. This functionality is not currently present when running on the Swift runtime. Therefore, you must currently provide an additional property, conventionally named `allTests`, in your `XCTestCase` subclass. This method lists all of the tests in the test class. The rest of your test case subclass still contains your test methods.
 
 ```swift
 class TestNSURL : XCTestCase {
-    var allTests : [(String, () -> Void)] {
+    static var allTests : [(String, TestNSURL -> () throws -> Void)] {
         return [
             ("test_URLStrings", test_URLStrings),
-            ("test_fileURLWithPath_relativeToURL", test_fileURLWithPath_relativeToURL ),
+            ("test_fileURLWithPath_relativeToURL", test_fileURLWithPath_relativeToURL),
             ("test_fileURLWithPath", test_fileURLWithPath),
             ("test_fileURLWithPath_isDirectory", test_fileURLWithPath_isDirectory),
             // Other tests go here
@@ -81,10 +81,10 @@ class TestNSURL : XCTestCase {
 }
 ```
 
-Also, this version of XCTest does not use the external test runner binary. Instead, create your own executable which links `libXCTest.so`. In your `main.swift`, invoke the `XCTMain` function with an array of instances of the test cases that you wish to run. For example:
+Also, this version of XCTest does not use the external test runner binary. Instead, create your own executable which links `libXCTest.so`. In your `main.swift`, invoke the `XCTMain` function with an array of the test cases classes that you wish to run, wrapped by the `testCase` helper function. For example:
 
 ```swift
-XCTMain([TestNSString(), TestNSArray(), TestNSDictionary()])
+XCTMain([testCase(TestNSString.allTests), testCase(TestNSArray.allTests), testCase(TestNSDictionary.allTests)])
 ```
 
 The `XCTMain` function does not return, and will cause your test app to exit with either `0` for success or `1` for failure.