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Testing Tempfile Extension Management in Paperclip

This test suite validates the functionality of Paperclip’s Tempfile implementation, focusing on temporary file handling and extension management. The tests ensure proper file extension handling and verify the core Tempfile behavior.

Test Coverage Overview

The test suite provides comprehensive coverage of Paperclip’s Tempfile functionality, focusing on two main scenarios.

Key areas tested include:

File extension handling with specified extensions
Behavior without file extensions
Verification of Tempfile inheritance
Proper temporary file creation and cleanup

Implementation Analysis

The testing approach utilizes RSpec’s context-based structure to separate distinct test scenarios. The implementation employs before/after hooks for proper resource management and cleanup, demonstrating isolated test cases for different file extension scenarios.

Technical patterns include:

Described_class usage for flexible class referencing
File extension validation using File.extname
Instance type checking with is_a?

Technical Details

Testing tools and configuration:

RSpec as the testing framework
Spec helper for test environment setup
Tempfile class from Ruby standard library
File class for path manipulation
Before and after hooks for resource management

Best Practices Demonstrated

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

Notable practices include:

Proper resource cleanup in after blocks
Contextual organization of related test cases
Clear test descriptions using RSpec’s descriptive syntax
Isolation of test scenarios
Consistent assertion patterns

thoughtbot/paperclip

spec/paperclip/tempfile_spec.rb

            
require "spec_helper"

describe Paperclip::Tempfile do
  context "A Paperclip Tempfile" do
    before do
      @tempfile = described_class.new(["file", ".jpg"])
    end

    after { @tempfile.close }

    it "has its path contain a real extension" do
      assert_equal ".jpg", File.extname(@tempfile.path)
    end

    it "is a real Tempfile" do
      assert @tempfile.is_a?(::Tempfile)
    end
  end

  context "Another Paperclip Tempfile" do
    before do
      @tempfile = described_class.new("file")
    end

    after { @tempfile.close }

    it "does not have an extension if not given one" do
      assert_equal "", File.extname(@tempfile.path)
    end

    it "is a real Tempfile" do
      assert @tempfile.is_a?(::Tempfile)
    end
  end
end