diff --git a/shondesh/channels/webhook.py b/shondesh/channels/webhook.py
index 6284980..71923bc 100644
--- a/shondesh/channels/webhook.py
+++ b/shondesh/channels/webhook.py
@@ -39,12 +39,13 @@ async def send(self, data: dict) -> bool:
             async with aiohttp.ClientSession() as session:
                 for attempt in range(self.config.get("retry_count", 1)):
                     try:
-                        async with session.request(
+                        response = await session.request(
                             self.config.get("method", "POST"),
                             self.config["url"],
                             json=payload,
                             headers=headers,
-                        ) as response:
+                        )
+                        async with response:
                             if response.status < 400:
                                 return True
                     except Exception as e:
diff --git a/shondesh/formatters/slack_message_formatter.py b/shondesh/formatters/slack_message_formatter.py
index 08c4dea..0c04528 100644
--- a/shondesh/formatters/slack_message_formatter.py
+++ b/shondesh/formatters/slack_message_formatter.py
@@ -17,3 +17,5 @@ def format(self, message: dict) -> list:
                     value.replace("`", "\\`").replace("*", "\\*").replace("_", "\\_")
                 )
             attachment_fields.append({"title": key, "value": str(value), "short": True})
+
+        return attachment_fields
diff --git a/tests/shondesh/channels/test_email.py b/tests/shondesh/channels/test_email.py
new file mode 100644
index 0000000..f3077da
--- /dev/null
+++ b/tests/shondesh/channels/test_email.py
@@ -0,0 +1,64 @@
+import pytest
+from shondesh.channels.email import Email
+
+
+@pytest.fixture
+def email_config():
+    return {
+        "from_address": "sender@example.com",
+        "recipients": ["recipient@example.com"],
+        "subject_template": "Test Subject",
+        "password": "testpassword",
+        "smtp_server": "smtp.example.com",
+        "smtp_port": 587,
+        "username": "user@example.com",
+    }
+
+
+@pytest.fixture
+def email_channel(email_config):
+    return Email(config=email_config)
+
+
+def test_email_properties(email_channel, email_config):
+    assert email_channel.config == email_config
+
+
+@pytest.mark.asyncio
+async def test_send_success(mocker, email_channel):
+    mock_smtp = mocker.patch("smtplib.SMTP", autospec=True)
+    data = {"key": "value"}
+    result = await email_channel.send(data)
+    assert result
+    mock_smtp.assert_called_with(
+        email_channel.config["smtp_server"], email_channel.config["smtp_port"]
+    )
+    instance = mock_smtp.return_value
+    instance.starttls.assert_called_once()
+    instance.login.assert_called_once_with(
+        email_channel.config["username"], email_channel.config["password"]
+    )
+    instance.sendmail.assert_called_once()
+    instance.quit.assert_called_once()
+
+
+@pytest.mark.asyncio
+async def test_send_env_password(mocker, email_channel, email_config, monkeypatch):
+    email_channel.config["password"] = "${EMAIL_PASSWORD}"
+    monkeypatch.setenv("EMAIL_PASSWORD", "envpassword")
+    mock_smtp = mocker.patch("smtplib.SMTP", autospec=True)
+    data = {"key": "value"}
+    result = await email_channel.send(data)
+    assert result
+    instance = mock_smtp.return_value
+    instance.login.assert_called_once_with(
+        email_channel.config["username"], "envpassword"
+    )
+
+
+@pytest.mark.asyncio
+async def test_send_failure(mocker, email_channel):
+    mocker.patch("smtplib.SMTP", side_effect=Exception("SMTP error"))
+    data = {"key": "value"}
+    result = await email_channel.send(data)
+    assert result is False
diff --git a/tests/shondesh/channels/test_slack.py b/tests/shondesh/channels/test_slack.py
new file mode 100644
index 0000000..d6606c3
--- /dev/null
+++ b/tests/shondesh/channels/test_slack.py
@@ -0,0 +1,53 @@
+import pytest
+from shondesh.channels.slack import Slack
+from shondesh.utils.constants import Severity
+
+
+@pytest.fixture
+def slack_config():
+    return {
+        "channel": "#alerts",
+        "username": "AlertBot",
+        "icon_emoji": ":robot_face:",
+        "webhook_url": "https://hooks.slack.com/services/test",
+        "mention_users": ["@user1", "@user2"],
+    }
+
+
+@pytest.fixture
+def slack_channel(slack_config):
+    return Slack(config=slack_config)
+
+
+@pytest.mark.asyncio
+async def test_send_success(mocker, slack_channel):
+    mocker.patch.object(
+        slack_channel, "send", mocker.AsyncMock(return_value={"ok": True})
+    )
+
+    data = {"severity": Severity.INFO, "message": "Test"}
+    result = await slack_channel.send(data)
+    assert result.get("ok") is True
+    slack_channel.send.assert_awaited_once_with(data)
+
+
+@pytest.mark.asyncio
+async def test_send_failure_status(mocker, slack_channel):
+    mocker.patch.object(
+        slack_channel, "send", mocker.AsyncMock(return_value={"ok": False})
+    )
+
+    data = {"severity": Severity.INFO, "message": "Test"}
+    result = await slack_channel.send(data)
+    assert result.get("ok") is False
+
+
+@pytest.mark.asyncio
+async def test_send_exception(mocker, slack_channel):
+    mock_session = mocker.MagicMock()
+    mock_session.__aenter__.side_effect = Exception("Connection error")
+    mocker.patch("aiohttp.ClientSession", return_value=mock_session)
+
+    data = {"severity": Severity.INFO, "message": "Test"}
+    result = await slack_channel.send(data)
+    assert result is False
diff --git a/tests/shondesh/channels/test_telegram.py b/tests/shondesh/channels/test_telegram.py
index 0655727..afddff1 100644
--- a/tests/shondesh/channels/test_telegram.py
+++ b/tests/shondesh/channels/test_telegram.py
@@ -13,6 +13,34 @@ def telegram_channel():
     return Telegram(config)
 
 
+def test_telegram_initialization(telegram_channel):
+    assert telegram_channel is not None
+    assert isinstance(telegram_channel, Telegram)
+    assert telegram_channel.config is not None
+    assert "token" in telegram_channel.config
+    assert "chat_id" in telegram_channel.config
+    assert "webhook_url" in telegram_channel.config
+
+
+def test_telegram_initialization_missing_config():
+    with pytest.raises(ValueError):
+        Telegram(config={})  # Should raise an error due to missing token and chat_id
+
+
+def test_raises_value_error_when_chat_id_is_missing():
+    config = {"webhook_url": "https://example.com/telegram"}
+    with pytest.raises(
+        ValueError, match="Telegram chat ID is required in the configuration."
+    ):
+        Telegram(config=config)
+
+
+def test_does_not_raise_error_when_chat_id_is_present():
+    config = {"webhook_url": "https://example.com/telegram", "chat_id": "12345"}
+    channel = Telegram(config=config)
+    assert channel.config["chat_id"] == "12345"
+
+
 def test_telegram_properties(telegram_channel):
     assert telegram_channel is not None
     assert telegram_channel.config is not None
@@ -27,3 +55,22 @@ async def test_telegram_send_message(mocker, telegram_channel):
     response = await telegram_channel.send(message)
     assert response is not None
     assert response.get("ok") is True
+
+
+@pytest.mark.asyncio
+async def test_telegram_send_message_failure(mocker, telegram_channel):
+    message = {"msg": "Test message", "severity": "info"}
+    mocker.patch.object(telegram_channel, "send", return_value={"ok": False})
+    response = await telegram_channel.send(message)
+    assert response is not None
+    assert response.get("ok") is False
+
+
+@pytest.mark.asyncio
+async def test_telegram_send_message_exception(mocker, telegram_channel):
+    message = {"msg": "Test message", "severity": "info"}
+    mocker.patch.object(
+        telegram_channel, "send", side_effect=Exception("Network error")
+    )
+    with pytest.raises(Exception):
+        await telegram_channel.send(message)
diff --git a/tests/shondesh/channels/test_webhook.py b/tests/shondesh/channels/test_webhook.py
new file mode 100644
index 0000000..fd65d7b
--- /dev/null
+++ b/tests/shondesh/channels/test_webhook.py
@@ -0,0 +1,80 @@
+import pytest
+from shondesh.channels.webhook import Webhook
+
+
+@pytest.fixture
+def webhook_config():
+    return {
+        "url": "https://example.com/webhook",
+        "method": "POST",
+        "headers": {"Authorization": "Bearer testtoken"},
+        "retry_count": 1,
+    }
+
+
+@pytest.fixture
+def webhook_channel(webhook_config):
+    return Webhook(config=webhook_config)
+
+
+@pytest.mark.asyncio
+async def test_send_success(mocker, webhook_channel):
+    mock_response = mocker.MagicMock()
+    mock_response.status = 200
+    mock_request = mocker.AsyncMock(return_value=mock_response)
+    mock_session = mocker.MagicMock()
+    mock_session.__aenter__.return_value = mock_session
+    mock_session.request = mock_request
+    mocker.patch("aiohttp.ClientSession", return_value=mock_session)
+
+    data = {"message": "Test"}
+    result = await webhook_channel.send(data)
+    assert result is True
+    mock_request.assert_awaited_once()
+
+
+@pytest.mark.asyncio
+async def test_send_failure_status(mocker, webhook_channel):
+    mock_response = mocker.MagicMock()
+    mock_response.status = 500
+    mock_request = mocker.AsyncMock(return_value=mock_response)
+    mock_session = mocker.MagicMock()
+    mock_session.__aenter__.return_value = mock_session
+    mock_session.request = mock_request
+    mocker.patch("aiohttp.ClientSession", return_value=mock_session)
+
+    data = {"message": "Test"}
+    result = await webhook_channel.send(data)
+    assert result is False
+
+
+@pytest.mark.asyncio
+async def test_send_exception(mocker, webhook_channel):
+    mock_session = mocker.MagicMock()
+    mock_session.__aenter__.side_effect = Exception("Connection error")
+    mocker.patch("aiohttp.ClientSession", return_value=mock_session)
+
+    data = {"message": "Test"}
+    result = await webhook_channel.send(data)
+    assert result is False
+
+
+@pytest.mark.asyncio
+async def test_send_env_header(monkeypatch, webhook_config, mocker):
+    webhook_config["headers"] = {"Authorization": "${WEBHOOK_TOKEN}"}
+    monkeypatch.setenv("WEBHOOK_TOKEN", "envtoken")
+    channel = Webhook(config=webhook_config)
+
+    mock_response = mocker.MagicMock()
+    mock_response.status = 200
+    mock_request = mocker.AsyncMock(return_value=mock_response)
+    mock_session = mocker.MagicMock()
+    mock_session.__aenter__.return_value = mock_session
+    mock_session.request = mock_request
+    mocker.patch("aiohttp.ClientSession", return_value=mock_session)
+
+    data = {"message": "Test"}
+    result = await channel.send(data)
+    assert result is True
+    _, kwargs = mock_request.call_args
+    assert kwargs["headers"]["Authorization"] == "envtoken"
diff --git a/tests/shondesh/formatters/__init__.py b/tests/shondesh/formatters/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/shondesh/formatters/test_dict_table_formatter.py b/tests/shondesh/formatters/test_dict_table_formatter.py
new file mode 100644
index 0000000..966388e
--- /dev/null
+++ b/tests/shondesh/formatters/test_dict_table_formatter.py
@@ -0,0 +1,17 @@
+from shondesh.formatters.dict_table_formatter import DictTableFormatter
+
+
+def test_dict_table_formatter():
+    formatter = DictTableFormatter()
+    data = {"Name": "Alice", "Age": 30, "Country": "Wonderland"}
+    expected = (
+        "Key     | Value     \n"
+        "--------+-----------\n"
+        "Name    | Alice     \n"
+        "Age     | 30        \n"
+        "Country | Wonderland"
+    )
+    result = formatter.format(data)
+    assert [line.rstrip() for line in result.splitlines()] == [
+        line.rstrip() for line in expected.splitlines()
+    ]
diff --git a/tests/shondesh/formatters/test_slack_message_formatter.py b/tests/shondesh/formatters/test_slack_message_formatter.py
new file mode 100644
index 0000000..086ec76
--- /dev/null
+++ b/tests/shondesh/formatters/test_slack_message_formatter.py
@@ -0,0 +1,37 @@
+import pytest
+from shondesh.formatters.slack_message_formatter import (
+    SlackMessageFormatter as SlackFormatter,
+)
+
+
+@pytest.fixture
+def slack_data():
+    return {
+        "message": "Test message",
+        "severity": "info",
+        "extra": {"foo": "bar"},
+        "timestamp": "2023-10-01T12:00:00Z",
+    }
+
+
+def test_slack_formatter_basic(slack_data):
+    formatter = SlackFormatter()
+    formatted = formatter.format(slack_data)
+    assert isinstance(formatted, list)
+    assert formatted
+    assert any(field["title"] == "message" for key, field in enumerate(formatted))
+
+
+def test_slack_formatter_severity(slack_data):
+    formatter = SlackFormatter()
+    slack_data["severity"] = "critical"
+    formatted = formatter.format(slack_data)
+    assert "danger" in str(formatted).lower() or "critical" in str(formatted).lower()
+
+
+def test_slack_formatter_extra_fields(slack_data):
+    formatter = SlackFormatter()
+    formatted = formatter.format(slack_data)
+    assert formatted
+    assert any(field["title"] == "extra" for key, field in enumerate(formatted))
+    assert any(field["value"] == "{'foo': 'bar'}" for field in formatted)
diff --git a/tests/shondesh/utils/__init__.py b/tests/shondesh/utils/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/shondesh/utils/test_constants.py b/tests/shondesh/utils/test_constants.py
new file mode 100644
index 0000000..e422777
--- /dev/null
+++ b/tests/shondesh/utils/test_constants.py
@@ -0,0 +1,25 @@
+import pytest
+from shondesh.utils.constants import Severity
+
+
+def returns_correct_value_for_info():
+    assert Severity.INFO.value == "info"
+
+
+def returns_correct_value_for_warning():
+    assert Severity.WARNING.value == "warning"
+
+
+def returns_correct_value_for_critical():
+    assert Severity.CRITICAL.value == "critical"
+
+
+def has_all_expected_severity_levels():
+    expected_levels = {"info", "warning", "critical"}
+    actual_levels = {severity.value for severity in Severity}
+    assert actual_levels == expected_levels
+
+
+def raises_attribute_error_for_invalid_severity():
+    with pytest.raises(AttributeError):
+        _ = Severity.INVALID