Disable ScyllaSniProxyTest — SNI proxy decommissioned from CCM

[dkropachev]

Problem

ScyllaSniProxyTest is consistently failing in CI because CCM no longer supports the --sni-proxy flag. SNI proxy functionality has been decommissioned from CCM, making these tests impossible to run.

CI build: java-driver-matrix-test #1930 (2026-03-18)

Failing tests

[ERROR] ScyllaSniProxyTest.beforeTestMethod[test_ccm_cluster_1node](0)  Time elapsed: 13.211 s  <<< FAILURE!
java.lang.AssertionError: The command ccm start --sni-proxy --sni-port 39943 --config-dir=/tmp/... failed to execute

[ERROR] ScyllaSniProxyTest.beforeTestMethod[test_ccm_cluster_3node](0)  Time elapsed: 4.284 s  <<< FAILURE!
java.lang.AssertionError: The command ccm start --sni-proxy --sni-port 43577 --config-dir=/tmp/... failed to execute

Both tests fail in beforeTestMethod → initTestContext at CCMTestsSupport.java:1017 when calling ccm start --sni-proxy. The --sni-proxy flag is no longer recognized by CCM.

Proposed fix

Disable or mark ScyllaSniProxyTest as @Ignore/skipped until an alternative test infrastructure for SNI proxy is available. These tests add 2 consistent failures to every CI run and cannot pass with current CCM.