Add test coverage for isApple and isDarwin

Author: rauhul

Tests/BasicsTests/TripleTests.swift

@@ -0,0 +1,79 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift open source project
+//
+// Copyright (c) 2022 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import Basics
+import XCTest
+
+final class TripleTests: XCTestCase {
+    func testIsAppleIsDarwin() {
+        func XCTAssertTriple(
+            _ triple: String,
+            isApple: Bool,
+            isDarwin: Bool,
+            file: StaticString = #filePath,
+            line: UInt = #line
+        ) {
+            guard let triple = try? Triple(triple) else {
+                XCTFail(
+                    "Unknown triple '\(triple)'.",
+                    file: file,
+                    line: line)
+                return
+            }
+            XCTAssert(
+                isApple == triple.isApple(),
+                """
+                Expected triple '\(triple.tripleString)' \
+                \(isApple ? "" : " not") to be an Apple triple.
+                """,
+                file: file,
+                line: line)
+            XCTAssert(
+                isDarwin == triple.isDarwin(),
+                """
+                Expected triple '\(triple.tripleString)' \
+                \(isDarwin ? "" : " not") to be a Darwin triple.
+                """,
+                file: file,
+                line: line)
+        }
+
+        XCTAssertTriple("x86_64-pc-linux-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("x86_64-pc-linux-musl", isApple: false, isDarwin: false)
+        XCTAssertTriple("powerpc-bgp-linux", isApple: false, isDarwin: false)
+        XCTAssertTriple("arm-none-none-eabi", isApple: false, isDarwin: false)
+        XCTAssertTriple("arm-none-linux-musleabi", isApple: false, isDarwin: false)
+        XCTAssertTriple("wasm32-unknown-wasi", isApple: false, isDarwin: false)
+        XCTAssertTriple("riscv64-unknown-linux", isApple: false, isDarwin: false)
+        XCTAssertTriple("mips-mti-linux-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("mipsel-img-linux-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("mips64-mti-linux-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("mips64el-img-linux-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("mips64el-img-linux-gnuabin32", isApple: false, isDarwin: false)
+        XCTAssertTriple("mips64-unknown-linux-gnuabi64", isApple: false, isDarwin: false)
+        XCTAssertTriple("mips64-unknown-linux-gnuabin32", isApple: false, isDarwin: false)
+        XCTAssertTriple("mipsel-unknown-linux-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("mips-unknown-linux-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("arm-oe-linux-gnueabi", isApple: false, isDarwin: false)
+        XCTAssertTriple("aarch64-oe-linux", isApple: false, isDarwin: false)
+        XCTAssertTriple("armv7em-unknown-none-macho", isApple: false, isDarwin: false)
+        XCTAssertTriple("armv7em-apple-none-macho", isApple: true, isDarwin: false)
+        XCTAssertTriple("armv7em-apple-none", isApple: true, isDarwin: false)
+        XCTAssertTriple("aarch64-apple-macosx", isApple: true, isDarwin: true)
+        XCTAssertTriple("x86_64-apple-macosx", isApple: true, isDarwin: true)
+        XCTAssertTriple("x86_64-apple-macosx10.15", isApple: true, isDarwin: true)
+        XCTAssertTriple("x86_64h-apple-darwin", isApple: true, isDarwin: true)
+        XCTAssertTriple("i686-pc-windows-msvc", isApple: false, isDarwin: false)
+        XCTAssertTriple("i686-pc-windows-gnu", isApple: false, isDarwin: false)
+        XCTAssertTriple("i686-pc-windows-cygnus", isApple: false, isDarwin: false)
+    }
+}