Add Jest tests for BNF parse/unparse functions

[Copilot]

Adds JavaScript test suite for BNF package mirroring the existing Python tests in bnf/tests/test_parse_unparse.py.

Changes

• Test suite: Created bnf/tests/test_parse_unparse.mjs with 18 test cases covering parse/unparse operations and roundtrip conversions
• Jest config: Added jest.config.mjs with test pattern matching and coverage collection
• Dependencies: Added jest, cross-env, and @types/jest to package.json devDependencies
• ANTLR generation: Updated parser generation scripts to use ANTLR 4.13.2 jar (older npm packages use incompatible versions 4.5/4.8)
• Bug fix: Corrected UnparseVisitor.visitUnary() to use ctx.getChild(1) instead of ctx.getChild(0) for operator extraction

Test Coverage

All 18 tests pass:

• Parse: simple rules, axioms, functions, subscripts, operators, multiple rules, complex expressions
• Unparse: same categories
• Roundtrip: bidirectional conversion validation

test("parse_simple_rule", () => {
    const dsp_input = "a, b -> c";
    const ds_output = parse(dsp_input);
    expect(ds_output).toBe("a\nb\n----\nc");
});

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Original prompt

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This section details on the original issue you should resolve

<issue_title>需要模仿bnf/tests中的python 测试写一下 js的测试, jest的配置可以参考repo root的那个package.json</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 需要模仿bnf/tests中的python 测试写一下 js的测试, jest的配置可以参考repo root的那个package.json #77

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[Copilot]

Pull request overview

This PR adds a comprehensive JavaScript test suite for the BNF parse/unparse functions, mirroring the existing Python tests. The implementation includes a bug fix in the UnparseVisitor.visitUnary() method that was discovered during test development. The Jest configuration follows the same pattern as the root package.json, ensuring consistency across the codebase.

• Adds 18 Jest test cases covering parse, unparse, and roundtrip operations for various BNF grammar constructs
• Configures Jest with test pattern matching and coverage collection
• Fixes a bug in UnparseVisitor.visitUnary() where the operator was being extracted from the wrong child index

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
bnf/tests/test_parse_unparse.mjs	New JavaScript test suite with 18 tests mirroring Python tests, covering parsing, unparsing, and roundtrip conversions for all grammar constructs
bnf/jest.config.mjs	Jest configuration for test discovery and coverage collection, consistent with root config pattern
bnf/package.json	Added test script, Jest dependencies (@types/jest, jest, cross-env), and "all" script to run build+test
bnf/atsds_bnf/index.mjs	Fixed UnparseVisitor.visitUnary() to use getChild(1) instead of getChild(0) to correctly extract the operator from the Ds grammar AST

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