diff --git a/test/units/module_utils/common/text/formatters/test_bytes_to_human.py b/test/units/module_utils/common/text/formatters/test_bytes_to_human.py
new file mode 100644
index 00000000000..41475f56cf0
--- /dev/null
+++ b/test/units/module_utils/common/text/formatters/test_bytes_to_human.py
@@ -0,0 +1,116 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019, Andrew Klychkov @Andersson007 <aaklychkov@mail.ru>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+import pytest
+
+from ansible.module_utils.common.text.formatters import bytes_to_human
+
+
+@pytest.mark.parametrize(
+    'input_data,expected',
+    [
+        (0, u'0.00 Bytes'),
+        (0.5, u'0.50 Bytes'),
+        (0.54, u'0.54 Bytes'),
+        (1024, u'1.00 KB'),
+        (1025, u'1.00 KB'),
+        (1536, u'1.50 KB'),
+        (1790, u'1.75 KB'),
+        (1048576, u'1.00 MB'),
+        (1073741824, u'1.00 GB'),
+        (1099511627776, u'1.00 TB'),
+        (1125899906842624, u'1.00 PB'),
+        (1152921504606846976, u'1.00 EB'),
+        (1180591620717411303424, u'1.00 ZB'),
+        (1208925819614629174706176, u'1.00 YB'),
+    ]
+)
+def test_bytes_to_human(input_data, expected):
+    """Test of bytes_to_human function, only proper numbers are passed."""
+    assert bytes_to_human(input_data) == expected
+
+
+@pytest.mark.parametrize(
+    'input_data,expected',
+    [
+        (0, u'0.00 bits'),
+        (0.5, u'0.50 bits'),
+        (0.54, u'0.54 bits'),
+        (1024, u'1.00 Kb'),
+        (1025, u'1.00 Kb'),
+        (1536, u'1.50 Kb'),
+        (1790, u'1.75 Kb'),
+        (1048576, u'1.00 Mb'),
+        (1073741824, u'1.00 Gb'),
+        (1099511627776, u'1.00 Tb'),
+        (1125899906842624, u'1.00 Pb'),
+        (1152921504606846976, u'1.00 Eb'),
+        (1180591620717411303424, u'1.00 Zb'),
+        (1208925819614629174706176, u'1.00 Yb'),
+    ]
+)
+def test_bytes_to_human_isbits(input_data, expected):
+    """Test of bytes_to_human function with isbits=True proper results."""
+    assert bytes_to_human(input_data, isbits=True) == expected
+
+
+@pytest.mark.parametrize(
+    'input_data,unit,expected',
+    [
+        (0, u'B', u'0.00 Bytes'),
+        (0.5, u'B', u'0.50 Bytes'),
+        (0.54, u'B', u'0.54 Bytes'),
+        (1024, u'K', u'1.00 KB'),
+        (1536, u'K', u'1.50 KB'),
+        (1790, u'K', u'1.75 KB'),
+        (1048576, u'M', u'1.00 MB'),
+        (1099511627776, u'T', u'1.00 TB'),
+        (1152921504606846976, u'E', u'1.00 EB'),
+        (1180591620717411303424, u'Z', u'1.00 ZB'),
+        (1208925819614629174706176, u'Y', u'1.00 YB'),
+        (1025, u'KB', u'1025.00 Bytes'),
+        (1073741824, u'Gb', u'1073741824.00 Bytes'),
+        (1125899906842624, u'Pb', u'1125899906842624.00 Bytes'),
+    ]
+)
+def test_bytes_to_human_unit(input_data, unit, expected):
+    """Test unit argument of bytes_to_human function proper results."""
+    assert bytes_to_human(input_data, unit=unit) == expected
+
+
+@pytest.mark.parametrize(
+    'input_data,unit,expected',
+    [
+        (0, u'B', u'0.00 bits'),
+        (0.5, u'B', u'0.50 bits'),
+        (0.54, u'B', u'0.54 bits'),
+        (1024, u'K', u'1.00 Kb'),
+        (1536, u'K', u'1.50 Kb'),
+        (1790, u'K', u'1.75 Kb'),
+        (1048576, u'M', u'1.00 Mb'),
+        (1099511627776, u'T', u'1.00 Tb'),
+        (1152921504606846976, u'E', u'1.00 Eb'),
+        (1180591620717411303424, u'Z', u'1.00 Zb'),
+        (1208925819614629174706176, u'Y', u'1.00 Yb'),
+        (1025, u'KB', u'1025.00 bits'),
+        (1073741824, u'Gb', u'1073741824.00 bits'),
+        (1125899906842624, u'Pb', u'1125899906842624.00 bits'),
+    ]
+)
+def test_bytes_to_human_unit_isbits(input_data, unit, expected):
+    """Test unit argument of bytes_to_human function with isbits=True proper results."""
+    assert bytes_to_human(input_data, isbits=True, unit=unit) == expected
+
+
+@pytest.mark.parametrize('input_data', [0j, u'1B', [1], {1: 1}, None, b'1B'])
+def test_bytes_to_human_illegal_size(input_data):
+    """Test of bytes_to_human function, illegal objects are passed as a size."""
+    e_regexp = (r'(no ordering relation is defined for complex numbers)|'
+                r'(unsupported operand type\(s\) for /)|(unorderable types)|'
+                r'(not supported between instances of)')
+    with pytest.raises(TypeError, match=e_regexp):
+        bytes_to_human(input_data)