diff --git a/tasks/.cs50.yml b/tasks/.cs50.yml
new file mode 100644
index 0000000..c2de080
--- /dev/null
+++ b/tasks/.cs50.yml
@@ -0,0 +1,4 @@
+check50:
+  files: &check50_files
+    - !exclude "*"
+    - !require tasks.py
diff --git a/tasks/__init__.py b/tasks/__init__.py
new file mode 100644
index 0000000..d855bb4
--- /dev/null
+++ b/tasks/__init__.py
@@ -0,0 +1,62 @@
+import check50
+from re import escape
+
+@check50.check()
+def exists():
+    """tasks.py exists"""
+    check50.exists("tasks.py")
+    check50.include("testing.py", "monday.txt")
+
+@check50.check(exists)
+def test_correct_input():
+    """tasks.py correctly accepts two command-line inputs"""
+    check50.run("python3 tasks.py").exit(code=1)
+
+@check50.check(exists)
+def test_simple_add():
+    """tasks.py correctly handles simple add case"""
+    output = "1. Attend Lecture\n2. Rip a Phonebook\n3. Eat"
+    check50.run("python3 tasks.py monday.txt").stdin("add Eat", prompt=True).stdout(regex(output), output).kill()
+
+@check50.check(exists)
+def test_print_add():
+    """tasks.py correctly prints added task"""
+    output = "1. Attend Lecture\n2. Rip a Phonebook\n3. Call David"
+    check50.run("python3 tasks.py monday.txt").stdin("add Call David", prompt=True).stdout(regex(output), output).kill()
+
+@check50.check(exists)
+def test_case_add():
+    """tasks.py correctly handles case-sensitive add"""
+    output = "1. Attend Lecture\n2. Rip a Phonebook\n3. Call David"
+    check50.run("python3 tasks.py monday.txt").stdin("aDd Call David", prompt=True).stdout(regex(output), output).kill()
+
+@check50.check(exists)
+def test_print_remove():
+    """tasks.py correctly prints list after removal"""
+    output = "1. Rip a Phonebook"
+    check50.run("python3 tasks.py monday.txt").stdin("remove Attend Lecture", prompt=True).stdout(regex(output), output).kill()
+
+@check50.check(exists)
+def test_case_remove():
+    """tasks.py correctly handles case-sensitive remove"""
+    output = "1. Rip a Phonebook"
+    check50.run("python3 tasks.py monday.txt").stdin("rEMoVe Attend Lecture", prompt=True).stdout(regex(output), output).kill()
+
+@check50.check(exists)
+def test_invalid_remove():
+    """tasks.py correctly exits when no match to remove"""
+    check50.run("python3 tasks.py monday.txt").stdin("remove Feed the Cat", prompt=True).exit(code=1)
+
+@check50.check(exists)
+def test_just_command():
+    """tasks.py correctly exits when no task is given"""
+    check50.run("python3 tasks.py monday.txt").stdin("add", prompt=True).exit(code=1)
+
+@check50.check(exists)
+def test_invalid_command():
+    """tasks.py correctly exits when invalid operation"""
+    check50.run("python3 tasks.py monday.txt").stdin("edit Rip a Phonebook", prompt=True).exit(code=1)
+
+def regex(text):
+    """match case-sensitively with any characters on either side"""
+    return rf"^.*{escape(text)}.*$"
diff --git a/tasks/monday.txt b/tasks/monday.txt
new file mode 100644
index 0000000..30fe521
--- /dev/null
+++ b/tasks/monday.txt
@@ -0,0 +1,2 @@
+Attend Lecture
+Rip a Phonebook
\ No newline at end of file
diff --git a/tasks/testing.py b/tasks/testing.py
new file mode 100644
index 0000000..b7eebbd
--- /dev/null
+++ b/tasks/testing.py
@@ -0,0 +1,16 @@
+from tasks import add_task, remove_task, txt_length, update_txt
+import sys
+
+def main():
+
+    argument = sys.argv[1]
+    tasks = ['Attend Lecture', 'Rip a Phonebook']
+    description = sys.argv[3]
+    filepath = sys.argv[1]
+
+    if argument == "add":
+        tasks.add_task(tasks, description, filepath)
+        print(tasks.txt_length(filepath))
+
+if __name__ == "__main__":
+    main()