Add tests for osx/macos alias (#407)

Co-authored-by: Niklas Mohrin <[email protected]>

tests/lib.rs

@@ -652,6 +652,34 @@ fn test_multiple_platform_command_search_not_found() {
         .stderr(contains("Page `windows-only` not found in cache."));
 }
 
+#[test]
+fn test_macos_is_alias_for_osx() {
+    let testenv = TestEnv::new();
+    testenv.add_os_entry("osx", "maconly", "this command only exists on mac");
+
+    testenv
+        .command()
+        .args(["--platform", "macos", "maconly"])
+        .assert()
+        .success();
+    testenv
+        .command()
+        .args(["--platform", "osx", "maconly"])
+        .assert()
+        .success();
+
+    testenv
+        .command()
+        .args(["--platform", "macos", "--list"])
+        .assert()
+        .stdout("maconly\n");
+    testenv
+        .command()
+        .args(["--platform", "osx", "--list"])
+        .assert()
+        .stdout("maconly\n");
+}
+
 #[test]
 fn test_common_platform_is_used_as_fallback() {
     let testenv = TestEnv::new();