V previousValue = oldValue.get();
        if (previousValue == null) {
          V newValue = loader.load(key);
          return set(newValue) ? futureValue : Futures.immediateFuture(newValue);
        }
        ListenableFuture<V> newValue = loader.reload(key, previousValue);
        if (newValue == null) {
          return Futures.immediateFuture(null);
        }

			}
		} else {
			os.Unsetenv(test.key)
		}

		t.Run(test.name, func(t *testing.T) {
			t.Setenv(test.key, test.newValue)
			if os.Getenv(test.key) != test.newValue {
				t.Fatalf("unexpected value after t.Setenv: got %s, want %s", os.Getenv(test.key), test.newValue)
			}
		})

		got, exists := os.LookupEnv(test.key)
		if got != test.initialValue {

		{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,

           * nullness checker.
           */
          K key = keyFunction.apply(t);
          V newValue = valueFunction.apply(t);
          accum.put(
              checkNotNull(key, "Null key for input %s", t),
              checkNotNull(newValue, "Null value for input %s", t));
        },
        EnumMapAccumulator::combine,
        EnumMapAccumulator::toImmutableMap,

           * nullness checker.
           */
          K key = keyFunction.apply(t);
          V newValue = valueFunction.apply(t);
          accum.put(
              checkNotNull(key, "Null key for input %s", t),
              checkNotNull(newValue, "Null value for input %s", t));
        },
        EnumMapAccumulator::combine,
        EnumMapAccumulator::toImmutableMap,

    @Override
    @CheckForNull
    V getValue(int index) {
      return at(index, columnIndex);
    }

    @Override
    @CheckForNull
    V setValue(int index, @CheckForNull V newValue) {
      return set(index, columnIndex, newValue);
    }
  }

  /**
   * Returns an immutable set of the valid column keys, including those that are associated with
   * null values only.
   *

    @Override
    @CheckForNull
    V getValue(int index) {
      return at(index, columnIndex);
    }

    @Override
    @CheckForNull
    V setValue(int index, @CheckForNull V newValue) {
      return set(index, columnIndex, newValue);
    }
  }

  /**
   * Returns an immutable set of the valid column keys, including those that are associated with
   * null values only.
   *