Add more unit tests.

namespaced_logging.nimble

@@ -13,3 +13,8 @@ requires @["nim >= 2.2.0", "zero_functional"]
 
 # from https://git.jdb-software.com/jdb/nim-packages
 requires "timeutils"
+
+task test, "Run unittests for the package.":
+  exec "nimble c src/namespaced_logging.nim src/namespaced_logging/autoconfigured.nim"
+  exec "src/namespaced_logging.out"
+  exec "src/namespaced_logging/autoconfigured"