Introduce end-to-end tests

For now I have added the most simple example for an NES/Famicom game,
which I already had on a private repository (that I plan to open source
soonish).

Tests simply run `nasm` on known source files and compares the results
with an .nes ROM file that has the exact bytes that we expect.

Signed-off-by: Miquel Sabaté Solà <[email protected]>

.github/workflows/ci.yml

@@ -26,6 +26,19 @@ jobs:
       - name: Run Clippy
         run: cargo clippy --all-targets --all-features
 
+  e2e-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Ensure latest Rust stable
+        run: |
+          rustup update stable
+          rustup default stable
+
+      - name: Run end-to-end tests
+        run: bash ./scripts/test-e2e.sh
+
   fuzz_parser:
     runs-on: ubuntu-latest
     steps:

scripts/full-test.sh

@@ -8,6 +8,8 @@ cargo build --all --all-targets --all-features
 cargo clippy --all-targets --all-features
 cargo test --all-targets --all-features -- --nocapture
 
+./scripts/test-e2e.sh
+
 pushd lib/xixanta
 cargo +nightly fuzz run fuzz_target_parser -- -max_total_time=180
 cargo +nightly fuzz run fuzz_target_assembler -- -max_total_time=180

scripts/test-e2e.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+
+set -ex
+
+rm -rf tests/out/
+mkdir -p tests/out/
+
+cargo build
+
+./target/debug/nasm -c nrom -Werror -o tests/out/sprite.nes tests/src/sprite.s
+diff tests/out/sprite.nes tests/bin/sprite.nes