Tests: TypeScript code

Tests for features introduced in v0.3.0

• xLINKx
• Password: xPASSWORDx
• xALIAS_DROPDOWNx
• xAx

Debug: Print dependency graph to console

For 0.4.1

Placeholder with a validator, that uses the new import_rules_from feature: xTEST_IMPORT_RULES_FROMx

See console (F12).