Improve test coverage across multiple modules

[Copilot]

Summary

This PR adds comprehensive test cases to improve coverage across multiple modules in the fj-doc repository, targeting classes that had no dedicated test coverage.

Changes

fj-doc-base — 8 new test classes

• TestEnumDocAlignH, TestEnumDocAlignV, TestEnumDocStyle — Tests for all enum values, fromValue(), and idFromValueWithDefault() (including unknown value fallback)
• TestDocStyleAlignHelper — Tests for parseStyle(), getAlign(), getValign() with known and unknown values
• TestDocParserHelper — Tests for the singleton, all recognized container tag names, and non-container rejections
• TestDocParserUtil — Tests for doubleNested() and doubleNestedWithDefaultInt() with primary key, fallback key, and default value paths
• TestDocTableUtil — Tests for table row partitioning (header vs data rows, strict header detection, empty tables, mixed header rows)
• TestDefaultMimeHelper — Tests for MIME type lookups for known types (pdf, xml, html, xls) and unknown types
• TestTableIntegrityCheckResult — Tests for result code, empty messages list, adding/setting messages
• TestReflectiveDocConvert — Tests the DocConvert implementation for content piping

fj-doc-lib-simpletable-import — New TestCommonConvertUtils

• Tests exception-rethrowing behavior (default rethrow-exception=1) for both CSV and XLSX conversion paths
• Tests null-return behavior when rethrow-exception=0 is set
• Uses broken InputStream and invalid byte content to trigger error paths

fj-doc-mod-opencsv — New TestOpenCSVTypeHandler

• Tests the non-UTF8 OpenCSVTypeHandler directly (complementing the existing UTF-8 handler test)
• Covers custom separator (;) and line-ending configuration path
• Covers default separator path and missing table ID path (empty output)
• Tests handler constants (TYPE_CSV, MODULE, MIME, HANDLER, HANDLER_UTF8)

fj-doc-base-yaml — New TestDocYamlJsonConvert

• Tests DocYamlToJson — YAML to JSON round-trip conversion
• Tests DocJsonToYaml — JSON to YAML round-trip conversion
• Tests YamlConstants.getDefaultMapper() not null

fj-doc-base-json — New TestJsonConstants

• Tests JsonConstants.getDefaultMapper() not null
• Tests DocObjectMapperConstants.PROPERTY_XSD_VERSION constant value

fj-doc-freemarker — New TestFMFunctions

• FMFunHelper — Tests parameter count validation with and without enough arguments, custom error messages
• CleanTextFun — Tests regex-based text cleaning with expected replacements, no-match case, and insufficient arguments
• TextWrapFun — Tests wrapping with valid input and throws on empty arguments
• FormatLocalDateTimeFun — Tests date/time formatting with LocalDateTime object and pattern, throws on too few arguments

Testing

All new tests pass. No existing tests were modified.

[codacy-production]

Not up to standards ⛔

🔴 Issues 2 medium

Alerts:
⚠ 2 issues (≤ 0 issues of at least minor severity)

Results:
2 new issues

Category	Results
BestPractice	2 medium

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🟢 Metrics 82 complexity

Metric	Results
Complexity	82

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