@Test
    public void test_3_1_depth() {
        int calleeDepth = 3;
        int callerDepth = 1;
        runTest(calleeDepth, callerDepth);
    }
USER -> WAS -> WAS -> WAS(center) -> UNKNOWN
web/src/test/java/com/navercorp/pinpoint/web/applicationmap/ApplicationMapBuilderTest.java