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pytestcoverage.py

PytestWarning: Failed to generate report: No data to report

I am trying to get a coverage report on my code by running the following command:

python3 -m pytest --cov-config=.coveragerc --cov=main/lambda_function tests

I am running the command in the terminal of pycharm within the repo and my main code is located under main/lambda_function.

I did have a .coveragerc configured correctly but once I relocated the lambda_function file under main, my coverage report stopped working:

[run]
source =
    lambda_function
    rds_config
[paths]
source =
    src/lambda_function
[report]
show_missing = true
precision = 2

I have attempted to add main/ but I get the error:

Coverage.py warning: Module main/lambda_function was never imported. (module-not-imported)
Coverage.py warning: No data was collected. (no-data-collected)
WARNING: Failed to generate report: No data to report.

What am I missing?

Solution

  • The value of --cov should be a path as documented:

    --cov=PATH

    Measure coverage for filesystem path. (multi-allowed)

    Try changing the coverage path to the containing directory main

    python3 -m pytest --cov-config=.coveragerc --cov=main tests

    Or try using the python module name notation of using dot . and without the file extension main.lambda_function

    python3 -m pytest --cov-config=.coveragerc --cov=main.lambda_function tests