@Nonnull
    @Beta
    public JobConfig addCustomClasspath(@Nonnull String name, @Nonnull String path) {
        throwIfLocked();
        List<String> classpathItems = customClassPaths.computeIfAbsent(name, (k) -> new ArrayList<>());
        classpathItems.add(path);
        return this;
    }
@Test
    public void addCustomClasspath() {
        JobConfig jobConfig = new JobConfig();
        jobConfig.addCustomClasspath("test", "url1");
        jobConfig.addCustomClasspath("test", "url2");

        assertThat(jobConfig.getCustomClassPaths()).containsValue(
                newArrayList("url1", "url2")
        );
    }