diff --git a/progress_bar/tests/test_progress_bar.py b/progress_bar/tests/test_progress_bar.py
new file mode 100644
index 0000000..084f779
--- /dev/null
+++ b/progress_bar/tests/test_progress_bar.py
@@ -0,0 +1,78 @@
+from contextlib import contextmanager
+from io import StringIO
+import sys
+import unittest
+
+from progress_bar import ProgressBar
+
+
+@contextmanager
+def captured_output():
+    """Capture stdout and stderr so we can assert against them."""
+    new_out, new_err = StringIO(), StringIO()
+    old_out, old_err = sys.stdout, sys.stderr
+    try:
+        sys.stdout, sys.stderr = new_out, new_err
+        yield sys.stdout, sys.stderr
+    finally:
+        sys.stdout, sys.stderr = old_out, old_err
+
+
+class ProgressBarTestCase(unittest.TestCase):
+    """Test the ProgressBar class."""
+
+    DEFAULT_VALUE = 0
+    DEFAULT_MAX_VALUE = 100
+    DEFAULT_PRINT_WIDTH = 50
+    DEFAULT_NEWLINE = "\r"
+
+    def setUp(self):
+        """Set up for test."""
+        self.bar = ProgressBar(quiet=True)
+
+    def tearDown(self):
+        """Clean up after test."""
+        self.bar = None
+    
+    def test_defaults(self):
+        """Test default values are correct."""
+        test_data = (
+            (self.bar.value, self.DEFAULT_VALUE,
+             "default value = {v}".format(v=self.DEFAULT_VALUE)),
+            (self.bar.initial_value, self.DEFAULT_VALUE,
+             "default initial value = {v}".format(v=self.DEFAULT_VALUE)),
+            (self.bar.max_value, self.DEFAULT_MAX_VALUE,
+             "default max value = {v}".format(v=self.DEFAULT_MAX_VALUE)),
+            (self.bar.print_width, self.DEFAULT_PRINT_WIDTH,
+             "default print width = {v}".format(v=self.DEFAULT_PRINT_WIDTH)),
+            (self.bar.newline, self.DEFAULT_NEWLINE,
+             "default newline = {v}".format(v=self.DEFAULT_NEWLINE)),
+        )
+        for actual, expected, description in test_data:
+            with self.subTest(msg=description):
+                self.assertEqual(actual, expected)
+    
+    def test_set_and_reset(self):
+        """Test setting and resetting the current value."""
+        self.bar.set(value=50)
+        self.assertEqual(self.bar.value, 50)
+        self.bar.reset()
+        self.assertEqual(self.bar.value, 0)
+    
+    def test_update_ad_draw(self):
+        """Test updating and drawing the progress bar."""
+        self.bar.reset()
+        self.bar.quiet = False
+        for i in range(self.bar.initial_value, self.bar.max_value + 1):
+            percent = int(i * 100 / self.bar.max_value)
+            dots = int(i * self.bar.print_width / self.bar.max_value)
+            expected_bar = "{nl}[{c}{nc}] {p}% ".format(
+                c="".join(["+"] * dots),
+                nc="".join(["."] * (self.bar.print_width - dots)),
+                p=percent, nl=self.bar.newline)
+            with captured_output() as (out, _):
+                self.bar.update(i)
+            with self.subTest(msg="value = {v}".format(v=i)):
+                self.assertEqual(self.bar.value, i)
+            with self.subTest(msg="output = {v}".format(v=expected_bar)):
+                self.assertEqual(out.getvalue(), expected_bar)