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Supported Python interpreters:

  • Python >= 2.7 and >= 3.5

Supported test frameworks:

  • pytest >= 3.0.0
    • pytest < 5 when using Python 2
  • pytest-benchmark >= 3.1.0
    • Python >= 3.7

Configuring reporting method

To report test results to Datadog, you need to configure the Datadog Python library:

If you are running tests on an on-premises CI provider, such as Jenkins or self-managed GitLab CI, install the Datadog Agent on each worker node by following the Agent installation instructions. This is the recommended option as test results are then automatically linked to the underlying host metrics.

If you are using a Kubernetes executor, Datadog recommends using the Datadog Admission Controller, which automatically sets the environment variables in the build pods to communicate with the local Datadog Agent.

If you are not using Kubernetes or can’t use Datadog Admission Controller and the CI provider is using a container-based executor, set the DD_TRACE_AGENT_URL environment variable (which defaults to http://localhost:8126) in the build container running the tracer to an endpoint that is accessible from within that container. Note that using localhost inside the build references the container itself and not the underlying worker node or any container where the Agent might be running.

DD_TRACE_AGENT_URL includes the protocol and port (for example, http://localhost:8126) and takes precedence over DD_AGENT_HOST and DD_TRACE_AGENT_PORT, and is the recommended configuration parameter to configure the Datadog Agent’s URL for CI Visibility.

If you still have issues connecting to the Datadog Agent, use the Agentless Mode. Note: By using this method, there will be no correlation between tests and infrastructure metrics.

If you are using a cloud CI provider without access to the underlying worker nodes, such as GitHub Actions or CircleCI, configure the library to use the Agentless mode. For this, set the following environment variables:

Enables or disables Agentless mode.
Default: false
DD_API_KEY (Required)
The Datadog API key used to upload the test results.
Default: (empty)

Additionally, configure which Datadog site to which you want to send data.

DD_SITE (Required)
The Datadog site to upload results to.
Default: datadoghq.com

Installing the Python tracer

Install the Python tracer by running:

pip install -U ddtrace

For more information, see the Python tracer installation documentation.

Instrumenting your tests

Using pytest

To enable instrumentation of pytest tests, add the --ddtrace option when running pytest, specifying the name of the service or library under test in the DD_SERVICE environment variable, and the environment where tests are being run (for example, local when running tests on a developer workstation, or ci when running them on a CI provider) in the DD_ENV environment variable:

DD_SERVICE=my-python-app DD_ENV=ci pytest --ddtrace

If you also want to enable the rest of the APM integrations to get more information in your flamegraph, add the --ddtrace-patch-all option:

DD_SERVICE=my-python-app DD_ENV=ci pytest --ddtrace --ddtrace-patch-all

Using pytest-benchmark

To instrument your benchmark tests with pytest-benchmark, run your benchmark tests with the --ddtrace option when running pytest, and Datadog detects metrics from pytest-benchmark automatically:

def square_value(value):
    return value * value

def test_square_value(benchmark):
    result = benchmark(square_value, 5)
    assert result == 25

Adding custom tags to tests

You can add custom tags to your tests by using the declaring ddspan as argument to your test:

from ddtrace import tracer

# Declare `ddspan` as argument to your test
def test_simple_case(ddspan):
    # Set your tags
    ddspan.set_tag("test_owner", "my_team")
    # test continues normally
    # ...

To create filters or group by fields for these tags, you must first create facets. For more information about adding tags, see the Adding Tags section of the Python custom instrumentation documentation.

Adding custom metrics to tests

Just like tags, you can add custom metrics to your tests by using the current active span:

from ddtrace import tracer

# Declare `ddspan` as an argument to your test
def test_simple_case(ddspan):
    # Set your tags
    ddspan.set_tag("memory_allocations", 16)
    # test continues normally
    # ...

Read more about custom metrics in the Add Custom Metrics Guide.

Configuration settings

The following is a list of the most important configuration settings that can be used with the tracer, either in code or using environment variables:

Name of the service or library under test.
Environment variable: DD_SERVICE
Default: pytest
Example: my-python-app
Name of the environment where tests are being run.
Environment variable: DD_ENV
Default: none
Examples: local, ci

The following environment variable can be used to configure the location of the Datadog Agent:

Datadog Agent URL for trace collection in the form http://hostname:port.
Default: http://localhost:8126

All other Datadog Tracer configuration options can also be used.

Collecting Git metadata

Datadog uses Git information for visualizing your test results and grouping them by repository, branch, and commit. Git metadata is automatically collected by the test instrumentation from CI provider environment variables and the local .git folder in the project path, if available.

If you are running tests in non-supported CI providers or with no .git folder, you can set the Git information manually using environment variables. These environment variables take precedence over any auto-detected information. Set the following environment variables to provide Git information:

URL of the repository where the code is stored. Both HTTP and SSH URLs are supported.
Example: git@github.com:MyCompany/MyApp.git, https://github.com/MyCompany/MyApp.git
Git branch being tested. Leave empty if providing tag information instead.
Example: develop
Git tag being tested (if applicable). Leave empty if providing branch information instead.
Example: 1.0.1
Full commit hash.
Example: a18ebf361cc831f5535e58ec4fae04ffd98d8152
Commit message.
Example: Set release number
Commit author name.
Example: John Smith
Commit author email.
Example: john@example.com
Commit author date in ISO 8601 format.
Example: 2021-03-12T16:00:28Z
Commit committer name.
Example: Jane Smith
Commit committer email.
Example: jane@example.com
Commit committer date in ISO 8601 format.
Example: 2021-03-12T16:00:28Z

Information collected

When CI Visibility is enabled, the following data is collected from your project:

  • Test names and durations.
  • Predefined environment variables set by CI providers.
  • Git commit history including the hash, message, author information, and files changed (without file contents).
  • Information from the CODEOWNERS file.

Further reading