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 {

  }

  /**
   * @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

        for (Map.Entry<String, Map<PhaseId, List<MojoExecution>>> entry : mappings.entrySet()) {
            List<MojoExecution> mojoExecutions = new ArrayList<>();

            for (List<MojoExecution> executions : entry.getValue().values()) {
                mojoExecutions.addAll(executions);
            }

            lifecycleMappings.put(entry.getKey(), mojoExecutions);
        }

        return lifecycleMappings;
    }

        List<XmlNode> children = new ArrayList<>();
        PlexusConfiguration[] ces = c.getChildren();
        if (ces != null) {
            for (PlexusConfiguration ce : ces) {
                String value = ce.getValue(null);
                String defaultValue = ce.getAttribute("default-value", null);
                if (value != null || defaultValue != null) {
                    XmlNode e = XmlNode.newInstance(

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

      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());

            this.projectProperties = projectProperties.entrySet().stream()
                    .collect(collectingAndThen(
                            toMap(e -> String.valueOf(e.getKey()), e -> String.valueOf(e.getValue())),
                            Collections::unmodifiableMap));
        } else {
            this.projectProperties = Collections.emptyMap();
        }

        return this;
    }

                context.lookup.lookupMap(ShellCommandRegistryFactory.class);
        for (Map.Entry<String, ShellCommandRegistryFactory> entry : factories.entrySet()) {
            holder.addCommandRegistry(entry.getValue().createShellCommandRegistry(context));
        }

        DefaultParser parser = new DefaultParser();
        parser.setRegexCommand("[:]{0,1}[a-zA-Z!]{1,}\\S*"); // change default regex to support shell commands

    Map<Class<? extends @NonNull B>, B> copy = new LinkedHashMap<>(map);
    for (Entry<? extends Class<? extends @NonNull B>, B> entry : copy.entrySet()) {
      cast(entry.getKey(), entry.getValue());
    }
    super.putAll(copy);
  }

  @CanIgnoreReturnValue
  @Override
  public <T extends B> @Nullable T putInstance(
      Class<@NonNull T> type, @ParametricNullness T value) {

                    NavigableMap<String, String> map = new SafeTreeMap<>();
                    for (Entry<String, String> entry : entries) {
                      map.put(entry.getKey(), entry.getValue());
                    }
                    return new StandardImplForwardingNavigableMap<>(map);
                  }
                })
            .named(