Add tooling to verify that all tests run on Linux

Tests/InkTests/CodeTests.swift

@@ -64,7 +64,7 @@ final class CodeTests: XCTestCase {
 }
 
 extension CodeTests {
-    static var allTests: [(String, TestClosure<CodeTests>)] {
+    static var allTests: Linux.TestList<CodeTests> {
         return [
             ("testInlineCode", testInlineCode),
             ("testCodeBlockWithJustBackticks", testCodeBlockWithJustBackticks),

Tests/InkTests/HTMLTests.swift

@@ -96,7 +96,7 @@ final class HTMLTests: XCTestCase {
 }
 
 extension HTMLTests {
-    static var allTests: [(String, TestClosure<HTMLTests>)] {
+    static var allTests: Linux.TestList<HTMLTests> {
         return [
             ("testTopLevelHTML", testTopLevelHTML),
             ("testNestedTopLevelHTML", testNestedTopLevelHTML),

Tests/InkTests/HeadingTests.swift

@@ -49,7 +49,7 @@ final class HeadingTests: XCTestCase {
 }
 
 extension HeadingTests {
-    static var allTests: [(String, TestClosure<HeadingTests>)] {
+    static var allTests: Linux.TestList<HeadingTests> {
         return [
             ("testHeading", testHeading),
             ("testHeadingsSeparatedBySingleNewline", testHeadingsSeparatedBySingleNewline),

Tests/InkTests/HorizontalLineTests.swift

@@ -39,7 +39,7 @@ final class HorizontalLineTests: XCTestCase {
 }
 
 extension HorizontalLineTests {
-    static var allTests: [(String, TestClosure<HorizontalLineTests>)] {
+    static var allTests: Linux.TestList<HorizontalLineTests> {
         return [
             ("testHorizonalLineWithDashes", testHorizonalLineWithDashes),
             ("testHorizontalLineWithDashesAtTheStartOfString", testHorizontalLineWithDashesAtTheStartOfString),

Tests/InkTests/ImageTests.swift

@@ -43,7 +43,7 @@ final class ImageTests: XCTestCase {
 }
 
 extension ImageTests {
-    static var allTests: [(String, TestClosure<ImageTests>)] {
+    static var allTests: Linux.TestList<ImageTests> {
         return [
             ("testImageWithURL", testImageWithURL),
             ("testImageWithReference", testImageWithReference),

Tests/InkTests/LinkTests.swift

@@ -55,7 +55,7 @@ final class LinkTests: XCTestCase {
 }
 
 extension LinkTests {
-    static var allTests: [(String, TestClosure<LinkTests>)] {
+    static var allTests: Linux.TestList<LinkTests> {
         return [
             ("testLinkWithURL", testLinkWithURL),
             ("testLinkWithReference", testLinkWithReference),

Tests/InkTests/LinuxCompatibility.swift

@@ -0,0 +1,55 @@
+/**
+*  Ink
+*  Copyright (c) John Sundell 2019
+*  MIT license, see LICENSE file for details
+*/
+
+import XCTest
+
+public enum Linux {}
+
+public extension Linux {
+    typealias TestCase = (testCaseClass: XCTestCase.Type, allTests: TestManifest)
+    typealias TestManifest = [(String, TestRunner)]
+    typealias TestRunner = (XCTestCase) throws -> Void
+    typealias TestList<T: XCTestCase> = [(String, Test<T>)]
+    typealias Test<T: XCTestCase> = (T) -> () throws -> Void
+}
+
+internal extension Linux {
+    static func makeTestCase<T: XCTestCase>(using list: TestList<T>) -> TestCase {
+        let manifest: TestManifest = list.map { name, function in
+            (name, { type in
+                try function(type as! T)()
+            })
+        }
+
+        return (T.self, manifest)
+    }
+}
+
+#if canImport(ObjectiveC)
+internal final class LinuxVerificationTests: XCTestCase {
+    func testAllTestsRunOnLinux() {
+        for testCase in allTests() {
+            let type = testCase.testCaseClass
+
+            let testNames: [String] = type.defaultTestSuite.tests.map { test in
+                let components = test.name.components(separatedBy: .whitespaces)
+                return components[1].replacingOccurrences(of: "]", with: "")
+            }
+
+            let linuxTestNames = Set(testCase.allTests.map { $0.0 })
+
+            for name in testNames {
+                if !linuxTestNames.contains(name) {
+                    XCTFail("""
+                    \(type).\(name) does not run on Linux.
+                    Please add it to \(type).allTests.
+                    """)
+                }
+            }
+        }
+    }
+}
+#endif

Tests/InkTests/ListTests.swift

@@ -97,7 +97,7 @@ final class ListTests: XCTestCase {
 }
 
 extension ListTests {
-    static var allTests: [(String, TestClosure<ListTests>)] {
+    static var allTests: Linux.TestList<ListTests> {
         return [
             ("testOrderedList", testOrderedList),
             ("testOrderedListWithoutIncrementedNumbers", testOrderedListWithoutIncrementedNumbers),

Tests/InkTests/MetadataTests.swift

@@ -69,7 +69,7 @@ final class MetadataTests: XCTestCase {
 }
 
 extension MetadataTests {
-    static var allTests: [(String, TestClosure<MetadataTests>)] {
+    static var allTests: Linux.TestList<MetadataTests> {
         return [
             ("testParsingMetadata", testParsingMetadata),
             ("testDiscardingEmptyMetadataValues", testDiscardingEmptyMetadataValues),

Tests/InkTests/ModifierTests.swift

@@ -79,7 +79,7 @@ final class ModifierTests: XCTestCase {
 }
 
 extension ModifierTests {
-    static var allTests: [(String, TestClosure<ModifierTests>)] {
+    static var allTests: Linux.TestList<ModifierTests> {
         return [
             ("testModifierInput", testModifierInput),
             ("testInitializingParserWithModifiers", testInitializingParserWithModifiers),

Tests/InkTests/TextFormattingTests.swift

@@ -139,7 +139,7 @@ final class TextFormattingTests: XCTestCase {
 }
 
 extension TextFormattingTests {
-    static var allTests: [(String, TestClosure<TextFormattingTests>)] {
+    static var allTests: Linux.TestList<TextFormattingTests> {
         return [
             ("testParagraph", testParagraph),
             ("testItalicText", testItalicText),

Tests/InkTests/XCTestManifests.swift

@@ -6,19 +6,17 @@
 
 import XCTest
 
-#if !canImport(ObjectiveC)
-public func allTests() -> [XCTestCaseEntry] {
+public func allTests() -> [Linux.TestCase] {
     return [
-        testCase(CodeTests.allTests),
-        testCase(HeadingTests.allTests),
-        testCase(HorizontalLineTests.allTests),
-        testCase(HTMLTests.allTests),
-        testCase(ImageTests.allTests),
-        testCase(LinkTests.allTests),
-        testCase(ListTests.allTests),
-        testCase(MetadataTests.allTests),
-        testCase(ModifierTests.allTests),
-        testCase(TextFormattingTests.allTests)
+        Linux.makeTestCase(using: CodeTests.allTests),
+        Linux.makeTestCase(using: HeadingTests.allTests),
+        Linux.makeTestCase(using: HorizontalLineTests.allTests),
+        Linux.makeTestCase(using: HTMLTests.allTests),
+        Linux.makeTestCase(using: ImageTests.allTests),
+        Linux.makeTestCase(using: LinkTests.allTests),
+        Linux.makeTestCase(using: ListTests.allTests),
+        Linux.makeTestCase(using: MetadataTests.allTests),
+        Linux.makeTestCase(using: ModifierTests.allTests),
+        Linux.makeTestCase(using: TextFormattingTests.allTests)
     ]
 }
-#endif