Add Jest tests for BNF parse/unparse functions (#78)

* Initial plan

* Add JavaScript tests for BNF parse/unparse functions with Jest

- Created bnf/tests/test_parse_unparse.mjs with 18 test cases
- Added Jest configuration in bnf/jest.config.mjs
- Updated bnf/package.json to include test script and Jest dependencies
- Fixed bug in UnparseVisitor.visitUnary() to use getChild(1) instead of getChild(0)
- Updated ANTLR parser generation scripts to use Java jar file
- All tests passing

Co-authored-by: hzhangxyz <[email protected]>

* Remove .gitignore.

* Update package.json.

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: hzhangxyz <[email protected]>
Co-authored-by: Hao Zhang <[email protected]>

Author: Copilot

bnf/atsds_bnf/index.mjs

@@ -93,7 +93,7 @@ class UnparseVisitor extends DsVisitor {
     }
 
     visitUnary(ctx) {
-        return `(${ctx.getChild(0).getText()} ${this.visit(ctx.term())})`;
+        return `(${ctx.getChild(1).getText()} ${this.visit(ctx.term())})`;
     }
 
     visitBinary(ctx) {

bnf/jest.config.mjs

@@ -0,0 +1,4 @@
+export default {
+    testMatch: ["<rootDir>/tests/test_*.mjs"],
+    collectCoverage: true,
+};