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Testing Database Connection Pool Management in PgHero

This test suite evaluates core functionality of the PgHero module, focusing on database connections, connection pooling, and maintenance operations. The tests verify essential database operations and connection handling in a multi-threaded environment, ensuring reliable database management capabilities.

Test Coverage Overview

The test suite provides comprehensive coverage of PgHero’s fundamental operations and connection management:

Database connectivity and enumeration verification
Connection pool behavior under concurrent access
Database maintenance operations including analyze and stats cleaning
Thread-safety validation for connection handling

Implementation Analysis

The testing approach employs Minitest framework with systematic validation of module functionality. Tests utilize instance variable manipulation and multi-threaded scenarios to verify connection pooling behavior. The implementation focuses on ensuring consistent database connections across concurrent operations.

Thread-safe connection pool testing
Instance variable cleanup and management
Assertion-based validation patterns

Technical Details

Testing infrastructure includes:

Minitest as the testing framework
Thread-based concurrency testing
Instance variable manipulation for state management
Connection pool verification through object identity checks
Database maintenance operation validation

Best Practices Demonstrated

The test suite exemplifies several testing best practices for Ruby database modules:

Isolation of connection pool behavior
Comprehensive coverage of maintenance operations
Thread-safety verification
Clean setup and teardown patterns
Systematic validation of core functionality

ankane/pghero

test/module_test.rb

            
require_relative "test_helper"

class ModuleTest < Minitest::Test
  def test_databases
    assert PgHero.databases.any?
  end

  def test_connection_pool
    1000.times do
      [:@config, :@databases].each do |var|
        PgHero.remove_instance_variable(var) if PgHero.instance_variable_defined?(var)
      end

      threads =
        2.times.map do
          Thread.new do
            PgHero.databases[:primary].instance_variable_get(:@connection_model)
          end
        end
      values = threads.map(&:value)
      assert_same values.first, values.last
      refute_nil values.first
    end
  end

  def test_analyze_all
    assert PgHero.analyze_all
  end

  def test_clean_query_stats
    assert PgHero.clean_query_stats
  end

  def test_clean_space_stats
    assert PgHero.clean_space_stats
  end
end