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Package Coverage

A Sublime Text package for unit testing and code coverage measurement

Labels testing

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Package Coverage

A Sublime Text package for running tests and reporting test coverage.

Utilizes the following Python packages, which are automatically installed into Sublime Text via Package Control dependencies:

  • unittest
  • coverage
  • sqlite3

Any package that contains dev/tests.py can be tested with this package. Coverage data from multiple machines and operating systems can be combined together via a SQLite database the package will create and populate. Using a solution like Dropbox to store the coverage database on makes for painless coverage aggregation and reporting.

Table of Contents

Installation

Use Package Control:

  1. Install Package Control
  2. Run the Package Control: Install Package command from the command palette
  3. Type Package Coverage and select the package

Setup

Package Coverage tries to keep things simple. It uses the unittest module to find all test classes defined in dev/tests.py of your package directory.

The only configuration is where you would like to store the SQLite database that tracks coverage results. One of the most convenient options is to store it in a Dropbox or Google Drive folder that is automatically synced between machines.

  1. Create the dev Directory
  2. Write Tests in dev/tests.py
  3. Create dev/reloader.py

Create the dev Directory

In the root of your package directory, create a subdirectory named dev/. Inside of the dev/ folder, create a file named __init__.py to make the dev/ directory into a package.

Write Tests in dev/tests.py

The file dev/tests.py should contain one or more unittest.TestCase classes. Since dev is a package, you can create test classes in other files and then use relative imports to import test classes into dev/tests.py.

Create dev/reloader.py

For iterative development of Sublime Text packages, it is necessary to ensure that the latest version of the Python code is running inside of Sublime Text‘s Python interpreter.

By default, Sublime Text will automatically reload any files ending in .py that are in the root of a package directory. While this works for simple packages, it is often insufficient for more complex packages.

To handle more complex packages, create a file named dev/reloader.py and paste the following boilerplate into it:

# coding: utf-8
from __future__ import unicode_literals, division, absolute_import, print_function

import sys


# The name of the package
pkg_name = 'My Package'

# A list of all python files in subdirectories, listed in their dependency order
pkg_files = [
    'subdir._types',
    'subdir._osx',
    'subdir._linux',
    'subdir._win',
    'subdir',
]

if sys.version_info >= (3,):
    from imp import reload
    prefix = pkg_name + '.'
else:
    prefix = ''

for pkg_file in pkg_files:
    pkg_file_path = prefix + pkg_file
    if pkg_file_path in sys.modules:
        reload(sys.modules[pkg_file_path])

Usage

Package Coverage provides the following command via the command palette:

Run Tests

This command runs the tests contained within dev/tests.py and outputs the results in a output panel at the bottom of Sublime Text.

Uses the quick panel to prompt the user for the package to test. Tests are run in a background thread, meaning the sublime API will not be accessible. Only packages in the Packages/ folder with a file named dev/tests.py will be presented.

Run Tests in UI Thread

The same as Run Tests, except the test are run in the UI thread, allowing access to the sublime API.

Run Tests by Name

The same as Run Tests, except the user may enter a regular expression to filter the tests to run, by their name.

Run Tests in UI Thread by Name

The same as Run Tests in UI Thread, except the user may enter a regular expression to filter the tests to run, by their name.

Measure Coverage

This command runs the tests in dev/tests.py and measures the code coverage. If a database path has been set, it saves the results in the SQLite coverage database.

Uses the quick panel to prompt the user for the package to test. Tests are run in a background thread, meaning the sublime API will not be accessible. Only packages in the Packages/ folder with a file named dev/tests.py will be presented.

Measure Coverage in UI Thread

The same as Measure Coverage, except the test are run in the UI thread, allowing access to the sublime API.

Measure Coverage with HTML Report

The same as Measure Coverage, except in addition to the output panel, an HTML report will be generated and opened in the user's default web browser.

Measure Coverage in UI Thread with HTML Report

The same as Measure Coverage with HTML Report, except the test are run in the UI thread, allowing access to the sublime API.

Set Database Path

Prompts the user to enter a full path to save the coverage database in. This is a SQLite database for the purpose of generating HTML reports from coverage results.

By saving the database in a sync-able filesystem such as Dropbox or Google Drive, the results from different operating systems are then used when generating an HTML report.

If the database path is set when a Sublime Text project is open, the database setting will be set to the project settings in the project file. Otherwise, the database setting will be editor-wide, and will be saved in Packages/User/Package Coverage.sublime-settings.

Only results from clean git repository with no changes will be saved in the coverage database.

Display Report

Uses the quick panel to prompt the user to pick a package with coverage results in the coverage database. Once a package is chosen, the user will be presented with a list of commits that have coverage results. Choosing a commit will compile the results from all different runs of the tests for that commit, generate an HTML report and open it in the user's default web browser.

Generated reports are placed in the dev/coverage_reports/ directory. It is recommended that directory be ignored using .gitignore or .hgignore. Exported reports are not automatically cleaned up, and must be purged using the Cleanups Reports command.

Cleanup Reports

Uses the quick panel to prompt the user with a list of packages that have exported reports saved on disk. When a package is chosen, all reports are permanently deleted.