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nescript/tests/emulator/package.json

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Add jsnes emulator harness and fix four codegen bugs it surfaced Running the compiled example ROMs through a headless puppeteer + local jsnes harness exposed four latent bugs that the header-structure-only integration tests couldn't catch: - src/asm/mod.rs: the first pass treated ANY instruction with `AddressingMode::Label` as a label definition, silently dropping every `JMP`/`JSR` to a label. Now only `NOP + Label` is a label def; other opcodes emit the opcode byte plus a 2-byte absolute fixup resolved in pass two. Without this, every example crashed with "invalid opcode at $1xxx" once the CPU fell through into the math runtime and hit an unbalanced `RTS`. - src/ir/lowering.rs (lower_handler): handler-local `VarDecl`s (e.g. `var i: u8 = 0` inside a `while`) were pushed onto `current_locals` but the handler built its own throwaway `locals` list, so those var ids never got RAM addresses and every `LoadVar`/`StoreVar` for them silently emitted nothing. Seed `current_locals` with the state's declared locals and reuse it so `lower_statement`'s appends flow through to the `IrFunction`. Fixes the black screen in `arrays_and_functions`. - src/ir/lowering.rs (global init): struct-literal initializers on globals (`var player: Player = Player { x: 120, ... }`) fell through to `eval_const`, which returned `None` for a non-literal, so no init code was emitted. Now the per-field synthetic globals each get their own `init_value`. Fixes the black screen in `structs_enums_for`. - src/codegen/mod.rs: the legacy AST codegen was emitting `JSR __fn_poke` / treating `peek` as `LDA #0` for the hardware intrinsics. It only "worked" before because the broken assembler swallowed the bogus JSR. Handle `poke`/`peek` as direct STA/LDA to a compile-time-constant absolute address, matching the IR codegen's intrinsic path. The harness lives in `tests/emulator/`: a tiny HTML page that wraps the `jsnes` npm package, driven by a puppeteer script that loads each ROM, runs ~180 frames, snapshots the canvas, and records a smoke-test verdict (booted without a CPU crash, non-zero pixels rendered, frames differ over time). `npm install && node run_examples.mjs` from `tests/emulator/` runs the full sweep. 9/9 example ROMs now load, render, and animate where expected. All 324 unit + 35 integration tests still pass. https://claude.ai/code/session_014Z5y3Q9krLcAxYpZQJhZ5V
2026-04-12 18:46:58 +00:00
{
"name": "nescript-emulator-tests",
"version": "1.0.0",
"description": "Local jsnes + puppeteer smoke test for compiled NEScript example ROMs.",
"private": true,
"type": "module",
"scripts": {
"test": "node run_examples.mjs"
},
"dependencies": {
"jsnes": "^2.1.0",
"puppeteer": "^24.40.0"
}
}
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