if (properties != null && !properties.isEmpty()) {
            return properties.entrySet().stream()
                    .collect(Collectors.toMap(e -> String.valueOf(e.getKey()), e -> String.valueOf(e.getValue())));

        } else {
            return null;
        }
    }

                          &numerical_grad_raw);
    ASSERT_EQ(errors::OK, s.code()) << s.message();
    numerical_grad.reset(numerical_grad_raw);
  }

  TF_Tensor* numerical_tensor;
  s = GetValue(numerical_grad.get(), &numerical_tensor);
  ASSERT_EQ(errors::OK, s.code()) << s.message();
  auto num_elem_numerical = TF_TensorElementCount(numerical_tensor);
  ASSERT_EQ(num_elem_numerical, num_grad);

            @Override
            public K getKey() {
              return backingEntry.getKey();
            }

            @Override
            public ImmutableSet<V> getValue() {
              return ImmutableSet.of(backingEntry.getValue());
            }
          };
        }
      };
    }

    // redeclare to help optimizers with b/310253115
    @SuppressWarnings("RedundantOverride")

  }

  private void putAll(Iterable<Entry<K, V>> entries) {
    Map<K, V> map = new LinkedHashMap<>();
    for (Entry<K, V> entry : entries) {
      map.put(entry.getKey(), entry.getValue());
    }
    getMap().putAll(map);
  }

  /**
   * Returns the {@link Method} instance for {@link #testPutAll_nullKeyUnsupported()} so that tests

            .forEach { (projectPath: String, projectExtension: TestFileCleanUpExtension) ->
                try {
                    projectExtension.verifyTestFilesCleanup(projectPath, projectPathToLeftoverFiles.getValue(projectPath))
                } catch (e: Exception) {
                    exceptions.add(e)
                }
            }
        when {
            exceptions.size == 1 -> throw exceptions.first()

  }

  /** @since 12.0 */
  @Override
  public void putAll(Map<? extends K, ? extends V> m) {
    for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
      put(entry.getKey(), entry.getValue());
    }
  }

  @Override
  public void cleanUp() {}

  @Override
  public long size() {
    throw new UnsupportedOperationException();
  }

  @Override

                result.getEffectiveToolchains().getToolchains().get(0).getConfiguration();
        assertEquals(
                interpolatedValue, toolchainConfiguration.getChild("jdkHome").getValue());
        assertNotNull(result.getProblems());
        assertEquals(0, result.getProblems().size());
    }

    @Test
    void testNonExistingEnvironmentVariablesAreNotInterpolated() throws Exception {

      Collection<V> collection = null;
      while (asMapItr.hasNext()) {
        Entry<K, Collection<V>> asMapEntry = asMapItr.next();
        if (key.equals(asMapEntry.getKey())) {
          collection = asMapEntry.getValue();
          break;
        }
      }
      assertNotNull(collection);
      Collection<V> expectedCollection = copyToList(collection);

      multimap().put(key, v3());

      Collection<V> collection = null;
      while (asMapItr.hasNext()) {
        Entry<K, Collection<V>> asMapEntry = asMapItr.next();
        if (key.equals(asMapEntry.getKey())) {
          collection = asMapEntry.getValue();
          break;
        }
      }
      assertNotNull(collection);
      Collection<V> expectedCollection = copyToList(collection);

      multimap().put(key, v3());

            for (Map.Entry<String, String> entry :
                    mavenOptions.userProperties().get().entrySet()) {
                cmdAndArguments.add("-D" + entry.getKey() + "=" + entry.getValue());
            }
        }
        if (mavenOptions.showVersionAndExit().orElse(false)) {
            cmdAndArguments.add("--version");
        }
        if (mavenOptions.showVersion().orElse(false)) {