diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3332504..799c88b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [UNRELEASED]
 
+### Added
+
+- Unit tests for the `ecs.py` module.
+
 ## [0.8.0] - 2022-08-17
 
 ### Changed
diff --git a/covalent_ecs_plugin/ecs.py b/covalent_ecs_plugin/ecs.py
index 0a9c6af..4ef5244 100644
--- a/covalent_ecs_plugin/ecs.py
+++ b/covalent_ecs_plugin/ecs.py
@@ -148,12 +148,12 @@ def __init__(
     def _is_valid_subnet_id(self, subnet_id: str) -> bool:
         """Check if the subnet is valid."""
 
-        return False if re.fullmatch(r"subnet-[0-9a-z]{8}", subnet_id) is None else True
+        return re.fullmatch(r"subnet-[0-9a-z]{8}", subnet_id) is not None
 
     def _is_valid_security_group(self, security_group: str) -> bool:
         """Check if the security group is valid."""
 
-        return False if re.fullmatch(r"sg-[0-9a-z]{8}", security_group) is None else True
+        return re.fullmatch(r"sg-[0-9a-z]{8}", security_group) is not None
 
     def run(self, function: Callable, args: List, kwargs: Dict, task_metadata: Dict):
         pass
diff --git a/tests/test_ecs.py b/tests/test_ecs.py
index e879be1..9141c2d 100644
--- a/tests/test_ecs.py
+++ b/tests/test_ecs.py
@@ -54,6 +54,10 @@ def ecs_executor(mocker):
 def test_executor_init_default_values(mocker):
     """Test that the init values of the executor are set properly."""
     mocker.patch("covalent_ecs_plugin.ecs.get_config", return_value="mock")
+    mocker.patch("covalent_ecs_plugin.ecs.ECSExecutor._is_valid_subnet_id", return_value=False)
+    mocker.patch(
+        "covalent_ecs_plugin.ecs.ECSExecutor._is_valid_security_group", return_value=False
+    )
     ecse = ECSExecutor()
     assert ecse.credentials == "mock"
     assert ecse.profile == "mock"
@@ -72,6 +76,29 @@ def test_executor_init_default_values(mocker):
     assert ecse.cache_dir == "mock"
 
 
+def test_executor_init_validation(mocker):
+    """Test that subnet and security group id is validated."""
+    mocker.patch("covalent_ecs_plugin.ecs.get_config", return_value="mock")
+    mocker.patch("covalent_ecs_plugin.ecs.ECSExecutor._is_valid_subnet_id", return_value=True)
+    mocker.patch(
+        "covalent_ecs_plugin.ecs.ECSExecutor._is_valid_security_group", return_value=False
+    )
+
+
+def test_is_valid_subnet_id(ecs_executor):
+    """Test the valid subnet checking method."""
+    assert ecs_executor._is_valid_subnet_id("subnet-871545e1") is True
+    assert ecs_executor._is_valid_subnet_id("subnet-871545e") is False
+    assert ecs_executor._is_valid_subnet_id("jlkjlkj871545e1") is False
+
+
+def test_is_valid_security_group(ecs_executor):
+    """Test the valid security group checking method."""
+    assert ecs_executor._is_valid_security_group("sg-0043541a") is True
+    assert ecs_executor._is_valid_security_group("sg-0043541") is False
+    assert ecs_executor._is_valid_security_group("80980043541") is False
+
+
 def test_get_aws_account(ecs_executor, mocker):
     """Test the method to retrieve the aws account."""
     mm = MagicMock()
@@ -81,6 +108,11 @@ def test_get_aws_account(ecs_executor, mocker):
     mm.client().get_caller_identity.get.called_once_with("Account")
 
 
+def test_execute(mocker):
+    """Test the execute method."""
+    pass
+
+
 def test_format_exec_script(ecs_executor):
     """Test method that constructs the executable tasks-execution Python script."""
     kwargs = {
@@ -168,3 +200,45 @@ def test_package_and_upload(ecs_executor, mocker):
     format_exec_script_mock.assert_called_once()
     format_dockerfile_mock.assert_called_once()
     get_ecr_info_mock.assert_called_once()
+
+
+def test_get_status(mocker, ecs_executor):
+    """Test the status checking method."""
+    ecs_mock = MagicMock()
+    ecs_mock.get_paginator().paginate.return_value = []  # Case 1: no tasks found
+    res = ecs_executor.get_status(ecs_mock, "")
+    assert res == ("TASK_NOT_FOUND", -1)
+
+    ecs_mock.get_paginator().paginate.return_value = [
+        {"taskArns": ["mock_task_arn"]}
+    ]  # Case 2 valid task found
+    ecs_mock.describe_tasks.return_value = {
+        "tasks": [
+            {"taskArn": "mock_task_arn", "lastStatus": "RUNNING", "containers": [{"exitCode": 1}]}
+        ]
+    }
+    res = ecs_executor.get_status(ecs_mock, "mock_task_arn")
+    assert res == ("RUNNING", 1)
+
+    ecs_mock.get_paginator().paginate.return_value = [
+        {"taskArns": ["mock_task_arn"]}
+    ]  # Case 3 - task found without any status
+    ecs_mock.describe_tasks.return_value = {
+        "tasks": [{"taskArn": "mock_task_arn", "lastStatus": "FAILED"}]
+    }
+    res = ecs_executor.get_status(ecs_mock, "mock_task_arn")
+    assert res == ("FAILED", -1)
+
+
+def test_poll_ecs_task(mocker, ecs_executor):
+    """Test the method to poll the ecs task."""
+
+
+def test_query_result(mocker):
+    """Test the method to query the result."""
+    pass
+
+
+def test_cancel(mocker):
+    """Test the execution cancellation method."""
+    pass