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Mamba

Mamba is a free, MIT-licensed behavior-driven development tool and test runner for Python developers.

Place
#20 of 30
Score
5.8
Mamba's website

What Mamba is

Mamba is a free, MIT-licensed behavior-driven development tool and test runner for Python developers. It organizes tests as specs using a descriptive DSL with constructs such as description, context, and it. Its documentation says the approach is influenced by RSpec, Mocha, Jasmine, and Ginkgo. The manual lists hooks, shared contexts, example groups, filtering, and focused examples, along with progress, documentation, and custom formatters. Mamba can highlight examples that exceed a configurable runtime threshold; the documented default is 0.75 seconds. It can also run with coverage enabled and generate a .coverage file for an HTML report. Installation is documented through pip or pipenv, and the getting-started guide lists Python 2.7 or higher as a prerequisite. Mamba does not provide its own assertion mechanism, so developers can use an assertion library such as expects, Hamcrest, should_dsl, or sure, or use plain Python assertions. It does not prescribe a test-double library either; Doublex and Mockito are examples. The maker invites contributions through repository forks and pull requests.

Good

  • Supports hooks, shared contexts, and example groups.
  • Offers filtering and focused examples.
  • Can generate coverage data for an HTML report.
  • Provides progress, documentation, and custom formatters.

Watch out

  • Python 2.7 or higher is listed as a prerequisite.
  • No built-in assertion mechanism.
  • Does not prescribe a test-double library.

Who it suits

Mamba suits Python developers who want to write behavior-driven specs and select their own assertion and test-double libraries. It runs locally on Linux.

Verdict

Mamba provides a descriptive spec structure, filtering, formatters, and coverage support while leaving assertion and test-double choices to developers. Check that its Python requirement and library-selection approach fit your project.

Plans and prices

From Mamba's own pricing page, checked 4 Oct 2026.

All about pricing
PlanPriceWhat it gives you
MambaFreeMIT-licensed software · installable as a Python package

The facts

Each one read from Mamba's own pages, with the date it was checked.

What it does

Assertions
Mamba does not include an assertion mechanism and says it should work with any assertion library, including expects, Hamcrest, should_dsl, sure, or plain Python assertions.checked 4 Oct 2026
Coverage
Mamba can be run with coverage enabled and generate a .coverage file for an HTML report.checked 4 Oct 2026
Filtering
The official manual lists filtering and focused examples as features.checked 4 Oct 2026
Formatters
The manual documents progress, documentation, and custom formatters.checked 4 Oct 2026
Hooks and contexts
The official manual lists hooks, shared contexts, and example groups among its features.checked 4 Oct 2026
Influences
Its documentation says Mamba is heavily influenced by RSpec, Mocha, Jasmine, and Ginkgo.checked 4 Oct 2026
Installation
The maker documents installation through pipenv or pip as a Python package.checked 4 Oct 2026
License
The repository includes the MIT license, which permits use, copying, modification, distribution, sublicensing, and sale subject to its conditions.checked 4 Oct 2026
Purpose
Mamba is a behavior-driven development tool and test runner for Python developers.checked 4 Oct 2026
Python requirement
The getting-started guide lists Python 2.7 or higher as a prerequisite.checked 4 Oct 2026
Slow examples
Mamba highlights examples that exceed a configurable time threshold, with a documented default of 0.75 seconds.checked 4 Oct 2026
Support and contributions
The maker invites contributions through repository forks and pull requests.checked 4 Oct 2026
Test doubles
The documentation says Mamba does not prescribe a test-double library and mentions Doublex and Mockito as examples.checked 4 Oct 2026
Test structure
Specs use a descriptive DSL with constructs such as description, context, and it.checked 4 Oct 2026

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