TermRouteContext example

$term = $this->createTerm($vocabulary);

    // Create RouteMatch from term entity.     $url = $term->toUrl();
    $route_provider = \Drupal::service('router.route_provider');
    $route = $route_provider->getRouteByName($url->getRouteName());
    $route_match = new RouteMatch($url->getRouteName(), $route, [
      'taxonomy_term' => $term,
    ]);

    // Initiate TermRouteContext with RouteMatch.     $provider = new TermRouteContext($route_match);

    $runtime_contexts = $provider->getRuntimeContexts([]);
    $this->assertArrayHasKey('taxonomy_term', $runtime_contexts);
    $this->assertTrue($runtime_contexts['taxonomy_term']->hasContextValue());
  }

}