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Testing PostgreSQL Replication Features in PgHero

This test suite validates PostgreSQL replication functionality in PgHero, focusing on core replication states and monitoring capabilities. The tests verify replica status, replication lag measurement, slot management, and replication state checking.

Test Coverage Overview

The test suite provides comprehensive coverage of PostgreSQL replication features, examining four critical aspects of database replication.

Verifies replica status detection
Tests replication lag measurement accuracy
Validates replication slot management
Checks replication state monitoring

Implementation Analysis

The implementation uses Minitest’s assertion framework to validate replication functionality. The tests employ a straightforward approach with individual test methods for each replication aspect, utilizing refute and assert statements for boolean checks and equality comparisons.

The testing pattern follows Ruby’s conventional unit testing structure with isolated test cases for each feature.

Technical Details

Testing Framework: Minitest

Database interaction through a ‘database’ helper method
Standard Ruby assertion methods (assert_equal, refute)
Custom test helper integration (test_helper.rb)
Zero-configuration test setup for basic replication checks

Best Practices Demonstrated

The test suite exemplifies clean and focused test design with single-responsibility test methods. Each test case targets a specific replication feature with clear assertions and minimal setup requirements.

Atomic test cases
Clear naming conventions
Consistent assertion patterns
Efficient test organization

ankane/pghero

test/replication_test.rb

            
require_relative "test_helper"

class ReplicationTest < Minitest::Test
  def test_replica
    refute database.replica?
  end

  def test_replication_lag
    assert_equal 0, database.replication_lag
  end

  def test_replication_slots
    assert_equal [], database.replication_slots
  end

  def test_replicating
    refute database.replicating?
  end
end