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  package org.apache.cayenne.configuration;
  
  import org.junit.Test;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  
  public class DefaultRuntimePropertiesTest {
  
      @Test
      public void testGet_FromMap() {
          Map<String, String> propertiesMap = new HashMap<>();
          propertiesMap.put("key1", "v1");
  
          DefaultRuntimeProperties properties = new DefaultRuntimeProperties(propertiesMap);
          assertEquals("v1", properties.get("key1"));
          assertNull(properties.get("key2"));
      }
  
      @Test
      public void testGet_FromSystem() {
  
          String userDir = System.getProperty("user.dir");
          assertNotNull(userDir);
  
          Map<String, String> propertiesMap = new HashMap<>();
  
          DefaultRuntimeProperties properties = new DefaultRuntimeProperties(propertiesMap);
          assertEquals(userDir, properties.get("user.dir"));
      }
  
      @Test
      public void testGet_FromSystemOverridesMap() {
  
          String userDir = System.getProperty("user.dir");
          assertNotNull(userDir);
  
          Map<String, String> propertiesMap = new HashMap<>();
          propertiesMap.put("user.dir", userDir + "_altered");
  
          DefaultRuntimeProperties properties = new DefaultRuntimeProperties(propertiesMap);
          assertEquals(userDir, properties.get("user.dir"));
      }
  }
  