diff --git a/CHANGELOG.md b/CHANGELOG.md
index 511754d..e542d86 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `engine` parameter added to `play` function
 - `engine` parameter added to `NavaThread` class
 - `README.md` modified
+- Test system modified
 - `__play_win` function renamed to `__play_winsound`
 - `__play_mac` function renamed to `__play_afplay`
 - `__play_linux` function renamed to `__play_alsa`
diff --git a/test/error_test.py b/test/error_test.py
index 03169f4..c223720 100644
--- a/test/error_test.py
+++ b/test/error_test.py
@@ -2,6 +2,7 @@
 """
 >>> import os
 >>> from nava import play, stop
+>>> test_sound_path = os.path.join("others", "test.wav")
 >>> play("test.wav")
 Traceback (most recent call last):
     ...
@@ -14,11 +15,11 @@
 Traceback (most recent call last):
     ...
 nava.errors.NavaBaseError: Given sound id doesn't exist.
->>> play(os.path.join("others", "test.wav"), async_mode=False, loop=True)
+>>> play(test_sound_path, async_mode=False, loop=True)
 Traceback (most recent call last):
     ...
 nava.errors.NavaBaseError: `loop` can not be set True when `async_mode` is False.
->>> play(os.path.join("others", "test.wav"), async_mode=True, loop=True, engine=2)
+>>> play(test_sound_path, async_mode=True, loop=True, engine=2)
 Traceback (most recent call last):
     ...
 nava.errors.NavaBaseError: `engine` type must be `Engine` enum.
diff --git a/test/function_test.py b/test/function_test.py
index 4708fe6..6ec62e9 100644
--- a/test/function_test.py
+++ b/test/function_test.py
@@ -4,23 +4,24 @@
 >>> import sys
 >>> import time
 >>> import nava
->>> nava.play(os.path.join("others", "test.wav"))
->>> sound_id_1 = nava.play(os.path.join("others", "test.wav"), async_mode=True)
+>>> test_sound_path = os.path.join("others", "test.wav")
+>>> nava.play(test_sound_path)
+>>> sound_id_1 = nava.play(test_sound_path, async_mode=True)
 >>> sound_id_1 == 1001
 True
->>> sound_id_2 = nava.play(os.path.join("others", "test.wav"), async_mode=True)
+>>> sound_id_2 = nava.play(test_sound_path, async_mode=True)
 >>> sound_id_2 == 1002
 True
->>> sound_id_3 = nava.play(os.path.join("others", "test.wav"), async_mode=True)
+>>> sound_id_3 = nava.play(test_sound_path, async_mode=True)
 >>> sound_id_3 == 1003
 True
->>> sound_id_4 = nava.play(os.path.join("others", "test.wav"), async_mode=True, loop=True)
+>>> sound_id_4 = nava.play(test_sound_path, async_mode=True, loop=True)
 >>> sound_id_4 == 1004
 True
 >>> nava.stop(sound_id_1)
 >>> nava.stop(sound_id_4)
 >>> for i in range(40):
-...     sound_id = nava.play(os.path.join("others", "test.wav"), async_mode=True)
+...     sound_id = nava.play(test_sound_path, async_mode=True)
 ...     time.sleep(0.2)
 >>> time.sleep(1)
 >>> nava.stop_all()
@@ -30,12 +31,12 @@
 True
 >>> sys_platform = sys.platform
 >>> if sys_platform == "win32":
-...     sound_id = nava.play(os.path.join("others", "test.wav"), async_mode=True, engine=nava.Engine.WINSOUND)
+...     sound_id = nava.play(test_sound_path, async_mode=True, engine=nava.Engine.WINSOUND)
 ... elif sys_platform == "darwin":
-...     sound_id = nava.play(os.path.join("others", "test.wav"), async_mode=True, engine=nava.Engine.AFPLAY)
+...     sound_id = nava.play(test_sound_path, async_mode=True, engine=nava.Engine.AFPLAY)
 ... else:
-...     sound_id = nava.play(os.path.join("others", "test.wav"), async_mode=True, engine=nava.Engine.ALSA)
->>> nava.functions.play_cli(os.path.join("others", "test.wav"))
+...     sound_id = nava.play(test_sound_path, async_mode=True, engine=nava.Engine.ALSA)
+>>> nava.functions.play_cli(test_sound_path)
 >>> nava.functions.nava_help()
 <BLANKLINE>
 A Python library for playing sound everywhere natively and securely.