exactly match a subcommand when using the infersubcommands

src/app/parser.rs

@@ -656,13 +656,12 @@ where
 
     // Checks if the arg matches a subcommand name, or any of it's aliases (if defined)
     fn possible_subcommand(&self, arg_os: &OsStr) -> (bool, Option<&str>) {
+        #[cfg(not(any(target_os = "windows", target_arch = "wasm32")))]
+        use std::os::unix::ffi::OsStrExt;
+        #[cfg(any(target_os = "windows", target_arch = "wasm32"))]
+        use osstringext::OsStrExt3;
         debugln!("Parser::possible_subcommand: arg={:?}", arg_os);
         fn starts(h: &str, n: &OsStr) -> bool {
-            #[cfg(not(any(target_os = "windows", target_arch = "wasm32")))]
-            use std::os::unix::ffi::OsStrExt;
-            #[cfg(any(target_os = "windows", target_arch = "wasm32"))]
-            use osstringext::OsStrExt3;
-
             let n_bytes = n.as_bytes();
             let h_bytes = OsStr::new(h).as_bytes();
 
@@ -694,6 +693,12 @@ where
                 .map(|sc| &sc.p.meta.name)
                 .collect::<Vec<_>>();
 
+            for sc in &v {
+                if OsStr::new(sc).as_bytes() == arg_os.as_bytes() {
+                    return (true, Some(sc));
+                }
+            }
+
             if v.len() == 1 {
                 return (true, Some(v[0]));
             }

tests/app_settings.rs

@@ -222,6 +222,19 @@ fn infer_subcommands_pass_close() {
     assert_eq!(m.subcommand_name(), Some("test"));
 }
 
+#[test]
+fn infer_subcommands_pass_exact_match() {
+    let m = App::new("prog")
+        .setting(AppSettings::InferSubcommands)
+        .subcommand(SubCommand::with_name("test"))
+        .subcommand(SubCommand::with_name("testa"))
+        .subcommand(SubCommand::with_name("testb"))
+        .get_matches_from(vec![
+            "prog", "test"
+        ]);
+    assert_eq!(m.subcommand_name(), Some("test"));
+}
+
 #[cfg(feature = "suggestions")]
 #[test]
 fn infer_subcommands_fail_suggestions() {