V oldValue = table.get(row, column);
    if (oldValue == null) {
      table.put(row, column, value);
    } else {
      V newValue = mergeFunction.apply(oldValue, value);
      if (newValue == null) {
        table.remove(row, column);
      } else {
        table.put(row, column, newValue);
      }
    }
  }

  private TableCollectors() {}

   * iterator tests.
   *
   * @return the new container instance
   * @param newValue the new container instance
   */
  @CanIgnoreReturnValue
  protected C resetContainer(C newValue) {
    container = newValue;
    return container;
  }

  /**
   * @see #expectContents(java.util.Collection)
   * @param elements expected contents of {@link #container}

		{cpuValue: uint64(100), expected: uint64(4000000000)},
	}
	var cpuCores = 4

	for _, tc := range testCases {
		p := perfCounterNodeStatsClient{}
		newValue := p.convertCPUValue(cpuCores, tc.cpuValue)
		assert.Equal(t, tc.expected, newValue)
	}
}

func TestGetCPUUsageNanoCores(t *testing.T) {
	// Scaled expected unit test values by the frequency the CPU perf counters are polled.

   * iterator tests.
   *
   * @return the new container instance
   * @param newValue the new container instance
   */
  @CanIgnoreReturnValue
  protected C resetContainer(C newValue) {
    container = newValue;
    return container;
  }

  /**
   * @see #expectContents(java.util.Collection)
   * @param elements expected contents of {@link #container}

    protected void validateMutation() {
        throw new UnsupportedOperationException("Minimal dependencies are immutable.");
    }

    @Override
    protected void validateMutation(Object currentValue, Object newValue) {
        validateMutation();
    }

    @Override
    public void copyTo(AbstractExternalModuleDependency target) {
        super.copyTo(target);
    }

    // Intentionally changes to the mutable version.

     *
     * @param key the key under which to store the session data, must not be {@code null}
     * @param oldValue the expected data currently associated with the key, may be {@code null}
     * @param newValue the data to associate with the key, may be {@code null} to remove the mapping
     * @return {@code true} if the key mapping was successfully updated from the old value to the new value,

            unshow(operation.getParent());
        }

        // No more unused label? Try to resize.
        if (unusedProgressLabels.isEmpty()) {
            int newValue = operationIdToAssignedLabels.size() + 1;
            resizeTo(newValue);
            // At this point, the work-in-progress area may or may not have been resized due to maximum size constraint.
        }

        // Try to use a new label

   */
  final void checkNoDuplicate(R rowKey, C columnKey, @CheckForNull V existingValue, V newValue) {
    checkArgument(
        existingValue == null,
        "Duplicate key: (row=%s, column=%s), values: [%s, %s].",
        rowKey,
        columnKey,
        newValue,
        existingValue);
  }

  // redeclare to satisfy our test for b/310253115
  @Override

   */
  final void checkNoDuplicate(R rowKey, C columnKey, @CheckForNull V existingValue, V newValue) {
    checkArgument(
        existingValue == null,
        "Duplicate key: (row=%s, column=%s), values: [%s, %s].",
        rowKey,
        columnKey,
        newValue,
        existingValue);
  }

  // redeclare to satisfy our test for b/310253115
  @Override

     */
    T get();

    /**
     * Sets the value for this cache. An exclusive lock is held while setting the value.
     */
    void set(T newValue);

    /**
     * Replaces the value for this cache.
     *
     * An exclusive lock is held while the update action is executing.
     * The result of the update is returned.
     */