diff --git a/.coverage b/.coverage
new file mode 100644
index 0000000..1dcbfb1
Binary files /dev/null and b/.coverage differ
diff --git a/README.md b/README.md
index 4a5b26f..d95db59 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,5 @@
 ![Static Badge](https://img.shields.io/badge/language-python-3670A0?style=for-the-badge&logo=python) ![Static Badge](https://img.shields.io/badge/Platform-Linux-FCC624?style=for-the-badge&logo=linux&logoColor=black)
 <a href="https://www.gnu.org/licenses/gpl-3.0"><img alt="License: GPL v3" src="https://img.shields.io/badge/License-GPLv3-blue.svg" height="30px"></a>
 
-[![Python application](https://github.com/TeamBenign/HW1/actions/workflows/python-app.yml/badge.svg)](https://github.com/TeamBenign/HW1/actions/workflows/python-app.yml)
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+[![Python application](https://github.com/TeamBenign/HW1/actions/workflows/python-app.yml/badge.svg)](https://github.com/TeamBenign/HW1/actions/workflows/python-app.yml)
+[![Coverage Status](coverage-badge.svg?dummy=8484744)](htmlcov/index.html)
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diff --git a/coverage-badge.svg b/coverage-badge.svg
new file mode 100644
index 0000000..6a4e15a
--- /dev/null
+++ b/coverage-badge.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="122" height="20" role="img" aria-label="coverage: 100.00%"><title>coverage: 100.00%</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="122" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="61" height="20" fill="#555"/><rect x="61" width="61" height="20" fill="#4c1"/><rect width="122" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="315" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="510">coverage</text><text x="315" y="140" transform="scale(.1)" fill="#fff" textLength="510">coverage</text><text aria-hidden="true" x="905" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="510">100.00%</text><text x="905" y="140" transform="scale(.1)" fill="#fff" textLength="510">100.00%</text></g></svg>
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diff --git a/coverage.xml b/coverage.xml
new file mode 100644
index 0000000..64cdcdc
--- /dev/null
+++ b/coverage.xml
@@ -0,0 +1,44 @@
+<?xml version="1.0" ?>
+<coverage version="7.6.1" timestamp="1724985917202" lines-valid="20" lines-covered="20" line-rate="1" branches-covered="0" branches-valid="0" branch-rate="0" complexity="0">
+	<!-- Generated by coverage.py: https://coverage.readthedocs.io/en/7.6.1 -->
+	<!-- Based on https://raw.githubusercontent.com/cobertura/web/master/htdocs/xml/coverage-04.dtd -->
+	<sources>
+		<source>/workspaces/HW1</source>
+	</sources>
+	<packages>
+		<package name="." line-rate="1" branch-rate="0" complexity="0">
+			<classes>
+				<class name="calculator.py" filename="calculator.py" complexity="0" line-rate="1" branch-rate="0">
+					<methods/>
+					<lines>
+						<line number="1" hits="1"/>
+						<line number="2" hits="1"/>
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+						<line number="9" hits="1"/>
+						<line number="10" hits="1"/>
+					</lines>
+				</class>
+				<class name="calculator_test.py" filename="calculator_test.py" complexity="0" line-rate="1" branch-rate="0">
+					<methods/>
+					<lines>
+						<line number="1" hits="1"/>
+						<line number="2" hits="1"/>
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+						<line number="16" hits="1"/>
+						<line number="17" hits="1"/>
+					</lines>
+				</class>
+			</classes>
+		</package>
+	</packages>
+</coverage>