Object newValue = new Object();
    valueRef.set(newValue);
    assertSame(newValue, cache.getUnchecked(new Object()));
  }

  public void testGetUnchecked_error() {
    final Error cause = new Error();
    final AtomicReference<Object> valueRef = new AtomicReference<>();
    LoadingCache<Object, Object> cache =
        new AbstractLoadingCache<Object, Object>() {
          @Override

        // execute
        ToolchainPrivate[] toolchains = toolchainManager.getToolchainsForType("basic", session);

        // verify
        verify(logger, never()).error(anyString());
        assertEquals(1, toolchains.length);
    }

    @Test
    void testToolchainsForUnknownType() throws Exception {
        // prepare
        MavenSession session = mock(MavenSession.class);

    throw new JudgmentError();
  }

  @Subscribe
  @AllowConcurrentEvents
  public void threadSafeMethod(Object arg) {}

  /** Local Error subclass to check variety of error thrown. */
  class JudgmentError extends Error {

    private static final long serialVersionUID = 634248373797713373L;
  }

   * independent stream each time it is called.
   *
   * <p>The caller is responsible for ensuring that the returned stream is closed.
   *
   * @throws IOException if an I/O error occurs while opening the stream
   */
  public abstract InputStream openStream() throws IOException;

  /**
   * Opens a new buffered {@link InputStream} for reading from this source. The returned stream is

                } catch (XmlReaderException ne) {
                    // still unreadable even in non-strict mode, rethrow original error
                    throw e;
                }

                Severity severity = request.isProjectBuild() ? Severity.ERROR : Severity.WARNING;
                problems.add(
                        severity,
                        ModelProblem.Version.V20,

  // identifiable substrings of expected error messages, from Strings that we've defined
  // here to provide error messages.
  // TODO(user): Some Strings used in the subclasses can be added as static Strings
  // here too.
  static final String ERROR_MODIFIABLE_SET = "Set returned is unexpectedly modifiable";
  static final String ERROR_SELF_LOOP = "self-loops are not allowed";

   *
   * @param from the input stream to read from
   * @param to the output stream to write to
   * @return the number of bytes copied
   * @throws IOException if an I/O error occurs
   */
  @CanIgnoreReturnValue
  public static long copy(InputStream from, OutputStream to) throws IOException {
    checkNotNull(from);
    checkNotNull(to);
    byte[] buf = createBuffer();

                } catch (DirectoryNotEmptyException e) {
                    // ignore
                }
            }
        } catch (IOException e) {
            LOGGER.error("Error while cleaning project local repository", e);
        }
    }

    /**
     * Retrieve a stream of the project's artifacts
     */
    private Stream<Artifact> getProjectArtifacts(MavenProject project) {

                }
            } catch (Exception e) {
                // TODO don't catch exception
                throw new ExpressionEvaluationException(
                        "Error evaluating plugin parameter expression: " + expression, e);
            }
        } else if ("reactorProjects".equals(expression)) {
            value = session.getProjects();
        } else if ("project".equals(expression)) {

    public void testWarn() throws Exception {
        logger.warn("warn");
    }

    /**
     * @throws Exception
     */
    @Test
    public void testError() throws Exception {
        logger.error("error");
    }

    /**
     * @throws Exception
     */
    @Test
    public void testFatal() throws Exception {
        logger.fatal("fatal");
    }

    /**
     * @throws Exception
     */