Fix test stack traces

src/lib.zig

@@ -515,10 +515,11 @@ pub const os = struct {
         if (os.is_being_debugged()) {
             @trap();
         } else {
-            switch (is_test) {
-                true => @panic("aborting"),
-                false => libc.exit(1),
+            if (is_test) {
+                @import("std").debug.dumpCurrentStackTrace(@returnAddress());
             }
+
+            libc.exit(1);
         }
     }
 

src/main.zig

@@ -9,7 +9,7 @@ pub const panic = lib.panic_struct;
 
 pub fn main(argc: c_int, argv: [*:null]const ?[*:0]const u8) callconv(.C) c_int {
     if (argc != 2) {
-        lib.print_string("Failed to match argument count");
+        lib.print_string("Failed to match argument count\n");
         return 1;
     }
     const relative_file_path_pointer = argv[1] orelse return 1;