test(arch): Add some tests

src/uu/arch/src/arch.rs

@@ -15,7 +15,7 @@ extern crate uucore;
 
 use platform_info::*;
 
-static SYNTAX: &str = "";
+static SYNTAX: &str = "Print machine architecture";
 static SUMMARY: &str = "Determine architecture name for current machine.";
 static LONG_HELP: &str = "";
 

tests/test_arch.rs

@@ -0,0 +1,18 @@
+use common::util::*;
+
+#[test]
+fn test_arch() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.run();
+    assert!(result.success);
+}
+
+#[test]
+fn test_arch_help() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("--help").run();
+    assert!(result.success);
+    assert!(result.stdout.contains("architecture name"));
+}

tests/tests.rs

@@ -46,6 +46,7 @@ macro_rules! generic {
     };
 }
 generic! {
+    "arch", test_arch;
     "base32", test_base32;
     "base64", test_base64;
     "basename", test_basename;