Creating a Drupal context programatically

my_module.module

<?php
/**
 * Implements hook_context_plugins().
 */
function mymodule_context_plugins() {
  $plugins = array();

  // Pre search context.
  $plugins['mymoduleContextConditionPreSearch'] = array(
    'handler' => array(
      // plugins folder removed as gist does not support subdirs.
      'path' => drupal_get_path('module', 'mymodule') . '/plugins',
      'file' => 'mymoduleContextConditionPreSearch.inc',
      'class' => 'mymoduleContextConditionPreSearch',
      'parent' => 'context_condition',
    ),
  );

  // Post search context.
  $plugins['mymoduleContextConditionPostSearch'] = array(
    'handler' => array(
      // plugins folder removed as gist does not support subdirs.
      'path' => drupal_get_path('module', 'mymodule') . '/plugins',
      'file' => 'mymoduleContextConditionPostSearch.inc',
      'class' => 'mymoduleContextConditionPostSearch',
      'parent' => 'context_condition',
    ),
  );

  return $plugins;
}

mymoduleContextConditionPostSearch.php

<?php
/**
 * @file
 * B2B Track and trace context post-search conditions.
 */
// @codingStandardsIgnoreFile

/**
 * Expose the values as a context condition.
 */
class mymoduleContextConditionPostSearch extends context_condition {
  /**
   * Implements condition_values().
   */
  public function condition_values() {
    $values = array(
      'TRUE' => t('Active', array(), array('context' => 'mymodule')),
    );

    return $values;
  }

  /**
   * Implements hook_execute().
   */
  public function execute() {
    // Since value = 2, we'll get relevant context(s) returned below.
    $some_value = 2;
    foreach ($this->get_contexts($some_value) as $context) {
      $this->condition_met($context);
    }
  }
}

mymoduleContextConditionPreSearch.php

<?php
/**
 * @file
 * B2B Track and trace context pre-search conditions.
 */
// @codingStandardsIgnoreFile

/**
 * Expose the values as a context condition.
 */
class B2bTrackandTraceContextConditionPreSearch extends context_condition {
  /**
   * Implements condition_values().
   */
  public function condition_values() {
    $values = array(
      'TRUE' => t('Active', array(), array('context' => 'mymodule')),
    );

    return $values;
  }

  /**
   * Implements hook_execute().
   */
  public function execute() {
    // Since value = 2, we'll get relevant context(s) returned below.
    $some_value = 2;
    foreach ($this->get_contexts($some_value) as $context) {
      $this->condition_met($context);
    }
  }
}