Added some info to the assertions.

Author: scr-oath

tests/testdata/test_api.lua

@@ -7,9 +7,9 @@ function TestTempDir(t)
     t:Run('createTmpDir', function(t)
         tempDir = t:TempDir()
         stat = goos.stat(tempDir)
-        assert(stat)
-        assert(stat.is_dir)
+        assert(stat, tempDir .. " does not exist")
+        assert(stat.is_dir, tempDir .. " is not a dir")
     end)
     assert(tempDir ~= '', tempDir)
-    assert(not goos.stat(tempDir))
+    assert(not goos.stat(tempDir), tempDir .. " exists after the subtest completes")
 end