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Testing Environment Variable Diff Implementation in bkeepers/dotenv

This test suite evaluates the Dotenv::Diff class functionality for comparing environment variables between two states. It verifies the detection of added, removed, and modified environment variables, ensuring accurate tracking of changes in .env files.

Test Coverage Overview

The test suite provides comprehensive coverage of environment variable state comparisons.

Key functionality tested includes:

Empty state comparisons
Addition of new environment variables
Removal of existing variables
Value changes in existing variables

Edge cases cover unchanged states and single variable modifications, while integration points focus on the Dotenv environment handling system.

Implementation Analysis

The testing approach utilizes RSpec’s context-based structure to organize different change scenarios.

Key patterns include:

Let blocks for test state setup
Subject-based testing for consistent object handling
Expectation matching for state verification

RSpec-specific features leverage shared context and dynamic subject declaration for DRY test implementation.

Technical Details

Testing tools and configuration:

RSpec testing framework
Spec helper integration
Context-based test organization
Hash-based state comparisons
Boolean and hash equality assertions

Best Practices Demonstrated

The test suite demonstrates excellent testing practices through clear organization and thorough state verification.

Notable practices include:

Isolated test contexts
Comprehensive state checking
Clear test case separation
Consistent assertion patterns
Efficient test setup reuse

bkeepers/dotenv

spec/dotenv/diff_spec.rb

            
require "spec_helper"

describe Dotenv::Diff do
  let(:before) { {} }
  let(:after) { {} }
  subject { Dotenv::Diff.new(a: before, b: after) }

  context "no changes" do
    let(:before) { {"A" => 1} }
    let(:after) { {"A" => 1} }

    it { expect(subject.added).to eq({}) }
    it { expect(subject.removed).to eq({}) }
    it { expect(subject.changed).to eq({}) }
    it { expect(subject.any?).to eq(false) }
    it { expect(subject.env).to eq({}) }
  end

  context "key added" do
    let(:after) { {"A" => 1} }

    it { expect(subject.added).to eq("A" => 1) }
    it { expect(subject.removed).to eq({}) }
    it { expect(subject.changed).to eq({}) }
    it { expect(subject.any?).to eq(true) }
    it { expect(subject.env).to eq("A" => 1) }
  end

  context "key removed" do
    let(:before) { {"A" => 1} }

    it { expect(subject.added).to eq({}) }
    it { expect(subject.removed).to eq("A" => 1) }
    it { expect(subject.changed).to eq({}) }
    it { expect(subject.any?).to eq(true) }
    it { expect(subject.env).to eq("A" => nil) }
  end

  context "key changed" do
    let(:before) { {"A" => 1} }
    let(:after) { {"A" => 2} }

    it { expect(subject.added).to eq({}) }
    it { expect(subject.removed).to eq({}) }
    it { expect(subject.changed).to eq("A" => [1, 2]) }
    it { expect(subject.any?).to eq(true) }
    it { expect(subject.env).to eq("A" => 2) }
  end
end