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Testing Environment Variable Preservation Helper in Foreman

This test suite validates environment variable handling in the Foreman project, focusing on the preserving_env helper method. The specs ensure proper environment variable state management during test execution, preventing test pollution and maintaining isolation.

Test Coverage Overview

The test suite provides comprehensive coverage of environment variable manipulation scenarios.

Tests environment variable addition and removal
Verifies restoration of original environment variable states
Handles both undefined and pre-existing environment variables
Ensures proper cleanup after modifications

Implementation Analysis

The implementation uses RSpec’s describe and it blocks to organize test cases around the preserving_env helper method. The testing approach employs before/after hooks for cleanup and uses expect assertions to verify environment variable states.

Uses RSpec context isolation
Implements after hooks for cleanup
Employs expectation matchers for assertions

Technical Details

Testing Framework: RSpec
Environment: Ruby
Test Scope: Unit tests
Key Components: ENV hash manipulation
Setup Requirements: spec_helper configuration

Best Practices Demonstrated

The test suite exemplifies several testing best practices for environment variable handling in Ruby applications.

Proper test isolation using preserving_env helper
Consistent cleanup after tests
Clear test case organization
Explicit state verification
Focused test scenarios

ddollar/foreman

spec/helper_spec.rb

            
require "spec_helper"

describe "spec helpers" do
  describe "#preserving_env" do
    after { ENV.delete "FOO" }

    it "should remove added environment vars" do
      old = ENV["FOO"]
      preserving_env { ENV["FOO"] = "baz" }
      expect(ENV["FOO"]).to eq(old)
    end

    it "should reset modified environment vars" do
      ENV["FOO"] = "bar"
      preserving_env { ENV["FOO"] = "baz"}
      expect(ENV["FOO"]).to eq("bar")
    end
  end
end