Mbed TLS test framework

This document is an overview of the Mbed TLS test framework and test tools.

This document is incomplete. You can help by expanding it.

Unit tests

See https://tls.mbed.org/kb/development/test_suites

Unit test descriptions

Each test case has a description which succinctly describes for a human audience what the test does. The first non-comment line of each paragraph in a .data file is the test description. The following rules and guidelines apply:

  • Test descriptions may not contain semicolons, line breaks and other control characters, or non-ASCII characters.
    Rationale: keep the tools that process test descriptions (generate_test_code.py, outcome file tools) simple.
  • Test descriptions must be unique within a .data file. If you can't think of a better description, the convention is to append #1, #2, etc.
    Rationale: make it easy to relate a failure log to the test data. Avoid confusion between cases in the outcome file.
  • Test descriptions should be a maximum of 66 characters.
    Rationale: 66 characters is what our various tools assume (leaving room for 14 more characters on an 80-column line). Longer descriptions may be truncated or may break a visual alignment.
    We have a lot of test cases with longer descriptions, but they should be avoided. At least please make sure that the first 66 characters describe the test uniquely.
  • Make the description descriptive. “foo: x=2, y=4” is more descriptive than “foo #2”. “foo: 0<x<y, both even” is even better if these inequalities and parities are why this particular test data was chosen.
  • Avoid changing the description of an existing test case without a good reason. This breaks the tracking of failures across CI runs, since this tracking is based on the descriptions.

tests/scripts/check-test-cases.py enforces some rules and warns if some guidelines are violated.

TLS tests

SSL extension tests

SSL test case descriptions

Each test case in ssl-opt.sh has a description which succinctly describes for a human audience what the test does. The test description is the first parameter to run_tests.

The same rules and guidelines apply as for unit test descriptions. In addition, the description must be written on the same line as run_test, in double quotes, for the sake of check-test-cases.py.

Running tests

Outcome file

Generating an outcome file

Unit tests and ssl-opt.sh record the outcome of each test case in a test outcome file. This feature is enabled if the environment variable MBEDTLS_TEST_OUTCOME_FILE is set. Set it to the path of the desired file.

If you run all.sh --outcome-file test-outcome.csv, this collects the outcome of all the test cases in test-outcome.csv.

Outcome file format

The outcome file is in a CSV format using ; (semicolon) as the delimiter and no quoting. This means that fields may not contain newlines or semicolons. There is no title line.

The outcome file has 6 fields:

  • Platform: a description of the platform, e.g. Linux-x86_64 or Linux-x86_64-gcc7-msan.
  • Configuration: a unique description of the configuration (config.h).
  • Test suite: test_suite_xxx or ssl-opt.
  • Test case: the description of the test case.
  • Result: one of PASS, SKIP or FAIL.
  • Cause: more information explaining the result.