@AfterClass
  public static void tearDown() {
    repairDb.close();
  }
Initialize parameters common to all tests.
@param testEncryption {@code true} to test with encryption enabled. {@code false} otherwise
@param metadataContentVersion the metadata content version to test with.
@param includeCloudDc {@code true} to make the local datacenter a cloud DC.
@throws Exception if initialization fails
ambry-router/src/test/java/com/github/ambry/router/NonBlockingRouterTest.java