NOTE: CTS has two meanings here. HDMI defines a set of tests in Compliance Test Specification in HDMI 1.4b *HDMI Compliance Test Specification 1.4b and Android Compatibility Test Suite.
Android Compatibility Test Suite include specific tests from HDMI Compliance Test Specification and other Android specific tests.
Running these CTS tests requires a specific HDMI layout with a CEC adapter.
Given the setup described above you can run all of these tests with the command
atest CtsHdmiCecHostTestCases