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Testing Editor Configuration Implementation in BetterErrors

This test suite validates the editor functionality in BetterErrors, focusing on proper handling of different editor configurations and default settings. It ensures the library correctly processes various input types for editor setup and maintains expected behavior across different scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of the BetterErrors editor configuration system.

Tests editor configuration with different input types (string, Proc, symbol)
Validates default editor behavior when no value is set
Covers error handling for invalid inputs
Tests integration with Editor class methods

Implementation Analysis

The implementation uses RSpec’s context-based structure to organize different test scenarios logically. It leverages RSpec’s mocking capabilities through extensive use of allow and expect statements to isolate the editor configuration logic.

Uses before blocks for test setup
Implements mock objects for Editor class methods
Employs subject-based testing pattern
Utilizes RSpec’s expectation syntax for assertions

Technical Details

RSpec testing framework
Mock objects via allow/receive patterns
Instance variable manipulation for testing
Exception testing with raise_error matcher
Nested context blocks for scenario organization

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Ruby and RSpec development.

Clear test organization using describe and context blocks
Proper isolation of test cases using mocks
Consistent error handling validation
DRY setup using before blocks
Descriptive test naming conventions

bettererrors/better_errors

spec/better_errors_spec.rb

            
require "spec_helper"

RSpec.describe BetterErrors do
  describe ".editor" do
    context "when set to a specific value" do
      before do
        allow(BetterErrors::Editor).to receive(:editor_from_symbol).and_return(:editor_from_symbol)
        allow(BetterErrors::Editor).to receive(:for_formatting_string).and_return(:editor_from_formatting_string)
        allow(BetterErrors::Editor).to receive(:for_proc).and_return(:editor_from_proc)
      end

      context "when the value is a string" do
        it "uses BetterErrors::Editor.for_formatting_string to set the value" do
          subject.editor = "thing://%{file}"
          expect(BetterErrors::Editor).to have_received(:for_formatting_string).with("thing://%{file}")
          expect(subject.editor).to eq(:editor_from_formatting_string)
        end
      end

      context "when the value is a Proc" do
        it "uses BetterErrors::Editor.for_proc to set the value" do
          my_proc = proc { "thing" }
          subject.editor = my_proc
          expect(BetterErrors::Editor).to have_received(:for_proc).with(my_proc)
          expect(subject.editor).to eq(:editor_from_proc)
        end
      end

      context "when the value is a symbol" do
        it "uses BetterErrors::Editor.editor_from_symbol to set the value" do
          subject.editor = :subl
          expect(BetterErrors::Editor).to have_received(:editor_from_symbol).with(:subl)
          expect(subject.editor).to eq(:editor_from_symbol)
        end
      end

      context "when set to something else" do
        it "raises an ArgumentError" do
          expect { subject.editor = Class.new }.to raise_error(ArgumentError)
        end
      end
    end

    context "when no value has been set" do
      before do
        BetterErrors.instance_variable_set('@editor', nil)
        allow(BetterErrors::Editor).to receive(:default_editor).and_return(:default_editor)
      end

      it "uses BetterErrors::Editor.default_editor to set the default value" do
          expect(subject.editor).to eq(:default_editor)
          expect(BetterErrors::Editor).to have_received(:default_editor)
      end
    end
  end
end