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Testing Query Statistics Generator Implementation in PgHero

This test suite validates the QueryStats generator functionality in PgHero, ensuring proper creation of database migrations for query statistics tracking. The tests verify the generator’s ability to create the necessary database table and schema for storing PostgreSQL query performance metrics.

Test Coverage Overview

The test suite provides essential coverage for the PgHero query statistics generator functionality.

Key areas tested include:

Migration file generation
Table creation verification
Schema structure validation

The test ensures the generator correctly creates the pghero_query_stats table migration, which is crucial for the application’s query monitoring capabilities.

Implementation Analysis

The implementation uses Rails::Generators::TestCase as the base testing framework, following standard Rails generator testing patterns.

Technical implementation features:

Generator test class inheritance structure
Destination path configuration
Migration file assertion checks

The test utilizes Rails’ built-in generator testing utilities to validate migration creation.

Technical Details

Testing tools and configuration:

Rails Generators Testing Framework
TestHelper integration
Temporary directory setup
Migration path validation

The test environment is configured using prepare_destination for isolated generator testing, ensuring clean test runs.

Best Practices Demonstrated

The test demonstrates several testing best practices for Rails generators.

Notable practices include:

Isolated test environment setup
Clear test method naming
Specific assertion checking
Proper generator class targeting

The code organization follows Rails convention for generator testing, ensuring maintainability and clarity.

ankane/pghero

test/query_stats_generator_test.rb

            
require_relative "test_helper"

require "generators/pghero/query_stats_generator"

class QueryStatsGeneratorTest < Rails::Generators::TestCase
  tests Pghero::Generators::QueryStatsGenerator
  destination File.expand_path("../tmp", __dir__)
  setup :prepare_destination

  def test_works
    run_generator
    assert_migration "db/migrate/create_pghero_query_stats.rb", /create_table :pghero_query_stats/
  end
end