Add test for behavior when classes fail to override allTests

Author: briancroom

Tests/Functional/MissingAllTestsTestCase/main.swift

@@ -0,0 +1,22 @@
+// RUN: %{swiftc} %s -o %{built_tests_dir}/MissingAllTestsTestCase
+// RUN: %{built_tests_dir}/MissingAllTestsTestCase > %t || true
+// RUN: %{xctest_checker} %t %s
+// CHECK: Test Case 'MissingAllTestsTestCase.missingTests' started.
+// CHECK: \<EXPR\>:0: unexpected error: MissingAllTestsTestCase.missingTests : threw error "XCTestCase subclasses must override the `allTests` property to list the individual tests they provide" - 
+// CHECK: Test Case 'MissingAllTestsTestCase.missingTests' failed \(\d+\.\d+ seconds\).
+// CHECK: Executed 1 test, with 1 failure \(1 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
+// CHECK: Total executed 1 test, with 1 failure \(1 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
+
+#if os(Linux) || os(FreeBSD)
+    import XCTest
+#else
+    import SwiftXCTest
+#endif
+
+class MissingAllTestsTestCase: XCTestCase {
+    func test_doesNotExecute() {
+        XCTAssert(false)
+    }
+}
+
+XCTMain([MissingAllTestsTestCase()])

XCTest.xcodeproj/project.pbxproj

@@ -26,6 +26,7 @@
 
 /* Begin PBXFileReference section */
 		342A33631C47383E001AA02A /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
+		34ED8F1C1C487143000DEDFC /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
 		5B5D86DB1BBC74AD00234F36 /* SwiftXCTest.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SwiftXCTest.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		9F320B0D1C4714EC00AB3456 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
 		B1384A411C1B3E8700EDF031 /* CONTRIBUTING.md */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = net.daringfireball.markdown; path = CONTRIBUTING.md; sourceTree = "<group>"; };
@@ -70,6 +71,14 @@
 			path = SetUpTearDownTestCase;
 			sourceTree = "<group>";
 		};
+		34ED8F1B1C48711B000DEDFC /* MissingAllTestsTestCase */ = {
+			isa = PBXGroup;
+			children = (
+				34ED8F1C1C487143000DEDFC /* main.swift */,
+			);
+			path = MissingAllTestsTestCase;
+			sourceTree = "<group>";
+		};
 		5B5D86D11BBC74AD00234F36 = {
 			isa = PBXGroup;
 			children = (
@@ -146,6 +155,7 @@
 				DADB975D1C44BE73005E68B6 /* FailingTestSuite */,
 				DADB97571C406879005E68B6 /* NegativeAccuracyTestCase */,
 				342A33621C47343C001AA02A /* SetUpTearDownTestCase */,
+				34ED8F1B1C48711B000DEDFC /* MissingAllTestsTestCase */,
 				DA78F7ED1C4039410082E15B /* xctest_checker */,
 			);
 			path = Functional;