Test should pass

TestConfigurationTest.groovy

package io.siren.federate.integrationtests.testframework

import org.junit.Assert
import spock.lang.Specification

import java.lang.reflect.Field

import static java.lang.System.getenv

final class TestConfigurationTest extends Specification {

  def "Fail when properties not set"() {
    when:
    TestConfiguration tc = TestConfiguration.getTestConfiguration()

    then:
    Exception ioEx = thrown()
    ioEx.message.contains('The following environment variables are required: ELASTICSEARCH_VERSION, FEDERATE_VERSION')
  }

  def "Can set env variables"() {
    given:
    Map<String, String> envMap = getEditableMapOfVariables()

    when:
    envMap.put('ELASTICSEARCH_VERSION', 'some version')
    envMap.put('FEDERATE_VERSION', 'some version')

    then:
    Assert.assertEquals(System.getenv('ELASTICSEARCH_VERSION'), 'some version')
    Assert.assertEquals(System.getenv('FEDERATE_VERSION'), 'some version')
  }

  def "Can make TestConfiguration fail after creation"() {
    given:
    Map<String, String> envMap = getEditableMapOfVariables()

    when:
    envMap.put('ELASTICSEARCH_VERSION', 'some version')
    envMap.put('FEDERATE_VERSION', 'some version')
    TestConfiguration tc = TestConfiguration.getTestConfiguration()

    envMap.remove('ELASTICSEARCH_VERSION')
    envMap.remove('FEDERATE_VERSION')

    then:
    Assert.assertNull(System.getenv('ELASTICSEARCH_VERSION'))
    Assert.assertNull(System.getenv('FEDERATE_VERSION'))
    Assert.assertNotNull(TestConfiguration.getSirenFederateVersion())
  }

  // Using https://github.com/stefanbirkner/system-lambda/blob/18e1f1ed60d1b4346371cdf09ad21c172f438309/src/main/java/com/github/stefanbirkner/systemlambda/SystemLambda.java#L1337
  private static Map<String, String> getEditableMapOfVariables() {
    Class<?> classOfMap = getenv().getClass();
    try {
      return getFieldValue(classOfMap, getenv(), "m");
    }
    catch (IllegalAccessException e) {
      throw new RuntimeException("System Rules cannot access the field"
        + " 'm' of the map System.getenv().", e);
    }
    catch (NoSuchFieldException e) {
      throw new RuntimeException("System Rules expects System.getenv() to"
        + " have a field 'm' but it has not.", e);
    }
  }

  private static Map<String, String> getFieldValue(
    Class<?> klass,
    Object object,
    String name
  ) throws NoSuchFieldException, IllegalAccessException {
    Field field = klass.getDeclaredField(name);
    field.setAccessible(true);
    return (Map<String, String>) field.get(object);
  }

}