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Testing Environment Variable Auto-Restoration in dotenv

This test suite validates the environment variable auto-restoration functionality in the dotenv gem. It ensures that environment variables are properly reset between test runs to maintain test isolation and prevent state leakage.

Test Coverage Overview

The test suite focuses on verifying the automatic restoration of environment variables between test executions.

Tests environment variable cleanup between consecutive test runs
Validates nil state of ENV variables before each test
Verifies isolation of test environments

Implementation Analysis

The testing approach utilizes ActiveSupport::TestCase as the base framework with Minitest integration. It implements a sequential testing pattern to verify state restoration between tests.

Uses ActiveSupport test helpers for structured test cases
Implements before/after test cleanup verification
Leverages dotenv/autorestore module functionality

Technical Details

Minitest test framework
ActiveSupport::TestCase integration
dotenv gem configuration
Environment variable manipulation
Automatic state restoration hooks

Best Practices Demonstrated

The test suite exemplifies strong testing practices by ensuring test isolation and preventing environmental state leakage between tests.

Proper test isolation
Environmental state cleanup
Clear assertion messages
Sequential validation approach

bkeepers/dotenv

test/autorestore_test.rb

            
require "active_support" # Rails 6.1 fails if this is not loaded
require "active_support/test_case"
require "minitest/autorun"

require "dotenv"
require "dotenv/autorestore"

class AutorestoreTest < ActiveSupport::TestCase
  test "restores ENV between tests, part 1" do
    assert_nil ENV["DOTENV"], "ENV was not restored between tests"
    ENV["DOTENV"] = "1"
  end

  test "restores ENV between tests, part 2" do
    assert_nil ENV["DOTENV"], "ENV was not restored between tests"
    ENV["DOTENV"] = "2"
  end
end