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        return map != null ? Collections.unmodifiableMap(map) : Collections.emptyMap();
    }

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

        } else {

    <profile>
      <id>pom-a</id>
      <properties>
        <pomProperty>a</pomProperty>
      </properties>
    </profile>
    <profile>
      <id>pom-b</id>
      <properties>
        <pomProperty>b</pomProperty>
      </properties>
    </profile>
    <profile>
      <id>pom-c</id>
      <properties>
        <pomProperty>c</pomProperty>
      </properties>
    </profile>
    <profile>

        }
        this.properties = Collections.unmodifiableMap(map);
    }

    public DefaultDependencyProperties(@Nonnull Map<String, String> properties) {
        this.properties = Collections.unmodifiableMap(nonNull(properties, "properties"));
    }

    @Nonnull
    @Override
    public Map<String, String> asMap() {
        return properties;
    }

    @Override

    @Test
    void resumeFromPropertyGetsApplied() {
        MavenExecutionRequest request = new DefaultMavenExecutionRequest();
        Properties properties = new Properties();
        properties.setProperty("remainingProjects", ":module-a");

        repository.applyResumptionProperties(request, properties);

        assertThat(request.getProjectActivation().getOptionalActiveProjectSelectors(), is(singleton(":module-a")));
    }

    @Test

        request.setLocalRepository(getLocalRepository());

        // native
        Properties properties = new Properties();
        properties.setProperty("maven.resolver.transport", "apache");
        request.setSystemProperties(properties);
        Map<String, Object> configProperties =
                systemSessionFactory.newRepositorySession(request).getConfigProperties();