diff --git a/.travis.yml b/.travis.yml
index f4a32a765b..60dc696e02 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -42,10 +42,12 @@ matrix:
 
 install:
   - pip install tox
+  - pip install codecov
   - sh scripts/download-semaphore.sh
 
 script:
   - sh scripts/runtox.sh
+  - codecov
 
 notifications:
   webhooks:
diff --git a/test-requirements.txt b/test-requirements.txt
index 1e55df6f11..4f886522df 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,3 +5,4 @@ six==1.11.0
 tox==3.2.1
 Werkzeug==0.14.1
 pytest-localserver==0.4.1
+pytest-cov==2.6.0
diff --git a/tests/test_client.py b/tests/test_client.py
index d09b9aaf4f..6322a5bf80 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -93,7 +93,10 @@ def send_event(self, event):
     start = time.time()
     output = subprocess.check_output([sys.executable, str(app)])
     end = time.time()
-    assert int(end - start) == num_messages / 10
+
+    # Each message takes at least 0.1 seconds to process
+    assert int(end - start) >= num_messages / 10
+
     assert output.count(b"HI") == num_messages
 
 
diff --git a/tox.ini b/tox.ini
index 7d222d24ef..d5ab231a8f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -70,7 +70,7 @@ basepython =
     pypy: pypy
 
 commands =
-    py.test {env:TESTPATH} {posargs}
+    py.test {env:TESTPATH} --cov=sentry_sdk {posargs}
 
 [testenv:linters]
 commands =