Adding test code trying to improve test coverage.

1 files changed, 39 insertions, 0 deletions

diff --git a/thread_utils.py b/thread_utils.py
index d8c85f4..51078a4 100644
--- a/thread_utils.py
+++ b/thread_utils.py
@@ -13,6 +13,19 @@ logger = logging.getLogger(__name__)
 
 
 def current_thread_id() -> str:
+    """Returns a string composed of the parent process' id, the current
+    process' id and the current thread identifier.  The former two are
+    numbers (pids) whereas the latter is a thread id passed during thread
+    creation time.
+
+    >>> ret = current_thread_id()
+    >>> (ppid, pid, tid) = ret.split('/')
+    >>> ppid.isnumeric()
+    True
+    >>> pid.isnumeric()
+    True
+
+    """
     ppid = os.getppid()
     pid = os.getpid()
     tid = threading.current_thread().name
@@ -22,6 +35,26 @@ def current_thread_id() -> str:
 def is_current_thread_main_thread() -> bool:
     """Returns True is the current (calling) thread is the process' main
     thread and False otherwise.
+
+    >>> is_current_thread_main_thread()
+    True
+
+    >>> result = None
+    >>> def thunk():
+    ...     global result
+    ...     result = is_current_thread_main_thread()
+
+    >>> thunk()
+    >>> result
+    True
+
+    >>> import threading
+    >>> thread = threading.Thread(target=thunk)
+    >>> thread.start()
+    >>> thread.join()
+    >>> result
+    False
+
     """
     return threading.current_thread() is threading.main_thread()
 
@@ -136,3 +169,9 @@ def periodically_invoke(
         return wrapper_repeat
 
     return decorator_repeat
+
+
+if __name__ == '__main__':
+    import doctest
+
+    doctest.testmod()