Add unit tests for XXHash32Wrapper

[em3s]

Background

XXHash32Wrapper class lacks direct unit tests. While it is used in other tests (EdgeIndexMapperTest, EdgeStateMapperTest, V2MultiEdgeBulkLoadTest), there are no dedicated tests that verify its core functionality.

Task

• Add unit tests for XXHash32Wrapper class.
• File path: core/src/main/kotlin/com/kakao/actionbase/core/codec/XXHash32Wrapper.kt (35 LOC)
• Test targets:
  • hash(bytes, offset, length) - Hash byte array with offset and length
  • stringHash(string) - Hash string value
  • insertTsHash / deleteTsHash - Verify constant hash values
  • create(seed) - Factory method with custom seed

Done When

• Test file created at core/src/test/kotlin/com/kakao/actionbase/core/codec/XXHash32WrapperTest.kt
• All public methods are covered with tests.
• Tests pass with ./gradlew :core:test.

Notes

Suggested test cases:

• hash() returns consistent value for same input
• hash() returns different values for different inputs
• stringHash() returns consistent value for same string
• insertTsHash and deleteTsHash are stable across instances
• Different seeds produce different hash values

Reference: core/src/test/kotlin/com/kakao/actionbase/core/codec/EdgeIndexMapperTest.kt

Please comment below and request assignment if you would like to work on this.