[PR] Add unit tests for ExpressionTokenizer [tomcat]

lihongyi87 opened a new pull request, #1035:
URL: https://github.com/apache/tomcat/pull/1035

   Adds direct unit tests for `org.apache.catalina.ssi.ExpressionTokenizer`, which currently has no dedicated test class. The tokenizer is only exercised indirectly through `ExpressionParseTree` in `TestExpressionParseTree`, which covers only 3 of the 12 token types (`TOKEN_STRING`, `TOKEN_EQ`, `TOKEN_END`).
   
   ## What is covered
   
   - All operator tokens: `(` `)` `=` `!=` `!` `||` `&&` `>` `>=` `<` `<=`
   - String values, including whitespace-separated multi-token expressions
   - Quoted strings (single and double quotes) and escaped quotes
   - Regular expression strings, including escaped slashes
   - Operators mixed with strings (e.g. `a && b`, `!a`, `a >= b`, `(a)`)
   - Edge cases: empty string, whitespace-only input (no tokens)
   
   ## Verification
   
   - All 30 parameterized cases pass
   - Full SSI test suite (`TestExpressionTokenizer`, `TestExpressionParseTree`, `TestRegExpCapture`, `TestSsiServlet`) passes on both NIO and NIO2 connectors


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