diff --git a/requirements-dev.txt b/requirements-dev.txt
index 86204fb..40f6a2a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,5 @@
 prefect==1.2.2
 requests==2.28.1
 boto3==1.26.40
-pytest==7.2.0
\ No newline at end of file
+pytest==7.2.0
+httpretty==1.1.4
\ No newline at end of file
diff --git a/tests/test_slack.py b/tests/test_slack.py
new file mode 100644
index 0000000..ac294fd
--- /dev/null
+++ b/tests/test_slack.py
@@ -0,0 +1,65 @@
+import json
+
+import httpretty
+import pytest
+
+from lolafect.slack import send_message_to_slack_channel, SendSlackMessageTask
+
+
+@httpretty.activate(allow_net_connect=False, verbose=True)
+def test_send_message_to_slack_channel_works_properly():
+    mock_webhook_url = "http://the-webhook-url.com"
+    mock_message_to_channel = "Hi there!"
+    httpretty.register_uri(method=httpretty.POST, uri=mock_webhook_url, status=200)
+
+    send_message_to_slack_channel(
+        webhook_url=mock_webhook_url, text_to_send=mock_message_to_channel
+    )
+
+    request_observed_by_server = httpretty.last_request()
+
+    assert (request_observed_by_server.method == "POST") and (
+        json.loads(request_observed_by_server.body.decode("UTF-8"))
+        == {"text": mock_message_to_channel}
+    )
+
+
+@httpretty.activate(allow_net_connect=False, verbose=True)
+def test_send_message_to_slack_channel_response_400_raises_exception():
+    mock_webhook_url = "http://the-webhook-url.com"
+    mock_message_to_channel = "Hi there!"
+    httpretty.register_uri(method=httpretty.POST, uri=mock_webhook_url, status=400)
+
+    with pytest.raises(ValueError):
+        send_message_to_slack_channel(
+            webhook_url=mock_webhook_url, text_to_send=mock_message_to_channel
+        )
+
+
+@httpretty.activate(allow_net_connect=False, verbose=True)
+def test_slack_task_reaches_server_successfully():
+    mock_webhook_url = "http://the-webhook-url.com"
+    mock_message_to_channel = "Hi there!"
+    httpretty.register_uri(method=httpretty.POST, uri=mock_webhook_url, status=200)
+
+    slack_task = SendSlackMessageTask()
+    slack_task.run(webhook_url=mock_webhook_url, text_to_send=mock_message_to_channel)
+
+    request_observed_by_server = httpretty.last_request()
+    assert (request_observed_by_server.method == "POST") and (
+        json.loads(request_observed_by_server.body.decode("UTF-8"))
+        == {"text": mock_message_to_channel}
+    )
+
+
+@httpretty.activate(allow_net_connect=False, verbose=True)
+def test_slack_task_raises_value_error():
+    mock_webhook_url = "http://the-webhook-url.com"
+    mock_message_to_channel = "Hi there!"
+    httpretty.register_uri(method=httpretty.POST, uri=mock_webhook_url, status=400)
+
+    with pytest.raises(ValueError):
+        slack_task = SendSlackMessageTask()
+        slack_task.run(
+            webhook_url=mock_webhook_url, text_to_send=mock_message_to_channel
+        )