A BS generates a test configuration of wireless signals for testing the BS for compliance with one or more criteria. The BS supports NB-IoT signals and NR signals, and is configured to support multiple carriers and to support operation within an RF bandwidth. The test configuration includes: a NB-IoT test signal placed as an outermost carrier at one or both edges of the RF bandwidth but not within a new radio minimum guard band, wherein for NB-IoT operation in new radio in-band, the NB-IoT test signal is placed as an outermost resource block within a NR transmission bandwidth configuration plus 15 kHz at an edge but not within the NR minimum guard band; and further test signal(s), comprising NR signals, in the RF bandwidth. The BS transmits the test configuration of wireless signals.