test: use NTS keyspace in PreparedStatementTest

[dkropachev]

Scylla 2026.2.0 rejects SimpleStrategy when tablet replication is enabled. A few short integration tests still created keyspaces with SimpleStrategy, which causes the Scylla IT matrix to fail before the actual test assertions run.

This switches those test keyspaces to NetworkTopologyStrategy with datacenter1 RF=1, matching the 3.x test-suite cleanup already done for other Scylla integration tests.

Observed failures:

• PreparedStatementTest.should_set_routing_key_on_case_sensitive_keyspace_and_table
• MapperKeyspaceTest.beforeTestClass
• UDTFieldMapperTest.udt_and_tables_with_ks_created_in_another_session_should_be_mapped
• UDTFieldMapperTest.udt_and_tables_without_ks_created_in_another_session_should_be_mapped
• InvalidConfigurationInQueryException: SimpleStrategy doesn't support tablet replication

Tested:

• mvn -pl driver-core com.coveo:fmt-maven-plugin:check -Dverbose=false
• mvn -pl driver-core -DskipTests test-compile -Dfmt.skip=true -Dclirr.skip=true -Danimal.sniffer.skip=true
• mvn -pl driver-core,driver-mapping com.coveo:fmt-maven-plugin:check -Dverbose=false
• mvn -pl driver-mapping -am -DskipTests test-compile -Dfmt.skip=true -Dclirr.skip=true -Danimal.sniffer.skip=true

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 170e76ba-5568-43f8-a2c3-8835470ed031

📥 Commits

Reviewing files that changed from the base of the PR and between 44ee468 and 7b18eeb.

📒 Files selected for processing (3)

• driver-core/src/test/java/com/datastax/driver/core/PreparedStatementTest.java
• driver-mapping/src/test/java/com/datastax/driver/mapping/MapperKeyspaceTest.java
• driver-mapping/src/test/java/com/datastax/driver/mapping/UDTFieldMapperTest.java

📝 Walkthrough

Walkthrough

This change modifies a single test in PreparedStatementTest.java. The CQL statement used to create the case-sensitive "Test" keyspace within the should_set_routing_key_on_case_sensitive_keyspace_and_table test now specifies NetworkTopologyStrategy with a datacenter1 setting, replacing the previous SimpleStrategy configuration with a replication_factor. No other test logic or public entities are affected.

Compact metadata:

• Files changed: 1
• Lines changed: +2/-2
• Estimated review effort: Medium

Related issues: None specified

Related PRs: None specified

Suggested labels: test, low-risk

Suggested reviewers: None specified

Poem:
A keyspace once simple, now spans a wide land,
NetworkTopologyStrategy takes command.
No factors of replication, just datacenter1's grace,
The routing key still finds its rightful place. 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly states the main change: switching PreparedStatementTest to use an NTS keyspace.
Description check	✅ Passed	The description matches the change and explains the Scylla tablet-replication issue and test impact.

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