WIP: Add a test fixture for testing Swift and Clang executable targets.

Author: abertelrud

Fixtures/Miscellaneous/TestableExe/Package.swift

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+// swift-tools-version:5.3
+import PackageDescription
+
+let package = Package(
+    name: "TestableExe",
+    targets: [
+        .target(
+            name: "TestableExe1"
+        ),
+        .target(
+            name: "TestableExe2"
+        ),
+        .target(
+            name: "TestableExe3"
+        ),
+        .testTarget(
+            name: "TestableExeTests",
+            dependencies: [
+                "TestableExe1",
+                "TestableExe2",
+                "TestableExe3",
+            ]
+        ),
+    ]
+)

Fixtures/Miscellaneous/TestableExe/Sources/TestableExe1/main.swift

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+public func GetGreeting1() -> String {
+    return "Hello, world"
+}
+
+print("\(GetGreeting1())!")

Fixtures/Miscellaneous/TestableExe/Sources/TestableExe2/main.swift

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+public func GetGreeting2() -> String {
+    return "Hello, planet"
+}
+
+print("\(GetGreeting2())!")

Fixtures/Miscellaneous/TestableExe/Sources/TestableExe3/include/TestableExe3.h

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+const char * GetGreeting3();

Fixtures/Miscellaneous/TestableExe/Sources/TestableExe3/main.c

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+#include <stdio.h>
+#include "include/TestableExe3.h"
+
+const char * GetGreeting3() {
+    return "Hello, universe";
+}
+
+int main() {
+    printf("%s!\n", GetGreeting3());
+}

Fixtures/Miscellaneous/TestableExe/Tests/LinuxMain.swift

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+import XCTest
+
+import TestableExeTests
+
+var tests = [XCTestCaseEntry]()
+tests += TestableExeTests.allTests()
+XCTMain(tests)

Fixtures/Miscellaneous/TestableExe/Tests/TestableExeTests/TestableExeTests.swift

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+import XCTest
+import TestableExe1
+import TestableExe2
+import TestableExe3
+import class Foundation.Bundle
+
+final class TestableExeTests: XCTestCase {
+    func testExample() throws {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        
+        XCTAssertEqual(GetGreeting1(), "Hello, world")
+        XCTAssertEqual(GetGreeting2(), "Hello, planet")
+        XCTAssertEqual(String(cString: GetGreeting3()), "Hello, universe")
+
+        // Some of the APIs that we use below are available in macOS 10.13 and above.
+        guard #available(macOS 10.13, *) else {
+            return
+        }
+
+        let fooBinary = productsDirectory.appendingPathComponent("TestableExe1")
+
+        let process = Process()
+        process.executableURL = fooBinary
+
+        let pipe = Pipe()
+        process.standardOutput = pipe
+
+        try process.run()
+        process.waitUntilExit()
+
+        let data = pipe.fileHandleForReading.readDataToEndOfFile()
+        let output = String(data: data, encoding: .utf8)
+
+        XCTAssertEqual(output, "Hello, world!\n")
+    }
+
+    /// Returns path to the built products directory.
+    var productsDirectory: URL {
+      #if os(macOS)
+        for bundle in Bundle.allBundles where bundle.bundlePath.hasSuffix(".xctest") {
+            return bundle.bundleURL.deletingLastPathComponent()
+        }
+        fatalError("couldn't find the products directory")
+      #else
+        return Bundle.main.bundleURL
+      #endif
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Fixtures/Miscellaneous/TestableExe/Tests/TestableExeTests/XCTestManifests.swift

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+import XCTest
+
+#if !canImport(ObjectiveC)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(TestableExeTests.allTests),
+    ]
+}
+#endif