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test(moonbit): add signed integer integration tests
Add tests for MoonBit signed integer types (s8, s16) to track upstream wit-bindgen bug #1518. New files: - test/moonbit/signed_integers.wit - WIT with s8/s16 type exports - test/moonbit/signed_integers.mbt - MoonBit implementation - test/moonbit/moonbit_component_tests.bzl - Analysis test rules - test/moonbit/BUILD.bazel - Test targets Tests verify: - moonbit_wasm_component provides WasmComponentInfo - Components with s8/s16 types build successfully - Component exports match WIT interface Note: Tests are tagged 'manual' because MoonBit toolchain is only available on darwin_arm64, linux_amd64, windows_amd64. Related: #325, #326 (tracking upstream bugs) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <[email protected]>
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‎test/moonbit/BUILD.bazel‎

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"""MoonBit WebAssembly Component Tests
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Tests for MoonBit component integration, including:
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- Analysis tests for moonbit_wasm_component rule
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- Signed integer type tests (tracking upstream bug #1518)
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Note: MoonBit toolchain is only available on:
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- darwin_arm64 (Apple Silicon Mac)
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- linux_amd64 (x86_64 Linux)
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- windows_amd64 (x86_64 Windows)
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Tests are tagged 'manual' to skip on unsupported platforms (darwin_amd64/Intel Mac).
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"""
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load("//moonbit:defs.bzl", "moonbit_wasm_component")
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load(":moonbit_component_tests.bzl", "moonbit_component_analysis_test", "moonbit_signed_integers_test", "moonbit_test_suite")
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package(default_visibility = ["//visibility:public"])
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# =============================================================================
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# Test Components
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# =============================================================================
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# Basic calculator component for analysis tests
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moonbit_wasm_component(
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name = "calculator_test_component",
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srcs = ["//examples/moonbit_component:calculator.mbt"],
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wit = "//examples/moonbit_component:calculator.wit",
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world = "calculator",
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tags = ["manual"], # MoonBit toolchain platform-limited
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)
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# Signed integers test component (tests upstream bug #1518)
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moonbit_wasm_component(
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name = "signed_integers_component",
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srcs = ["signed_integers.mbt"],
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wit = "signed_integers.wit",
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world = "signed-integers",
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tags = ["manual"], # MoonBit toolchain platform-limited
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)
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# =============================================================================
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# Analysis Tests
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# =============================================================================
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# Test that moonbit_wasm_component provides correct WasmComponentInfo
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moonbit_component_analysis_test(
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name = "moonbit_component_analysis_test",
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target_under_test = ":calculator_test_component",
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tags = ["manual"], # MoonBit toolchain platform-limited
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)
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# Test signed integer types (s8, s16) build correctly
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# Note: Runtime value corruption is tracked in upstream #1518
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moonbit_signed_integers_test(
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name = "signed_integers_analysis_test",
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target_under_test = ":signed_integers_component",
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tags = ["manual"], # MoonBit toolchain platform-limited
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)
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# =============================================================================
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# Test Suite
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# =============================================================================
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moonbit_test_suite(
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name = "moonbit_tests",
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)
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# =============================================================================
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# Build Tests (for CI on supported platforms)
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# =============================================================================
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# Genrule to validate component structure with wasm-tools
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genrule(
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name = "validate_signed_integers",
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srcs = [":signed_integers_component"],
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outs = ["signed_integers_valid.marker"],
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cmd = """
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$(location @rules_wasm_component//toolchains:wasm_tools) component wit $(location :signed_integers_component) > /dev/null && \
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echo "MoonBit signed integers component validated" > $@
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""",
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tags = ["manual"], # MoonBit toolchain platform-limited
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tools = ["@rules_wasm_component//toolchains:wasm_tools"],
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)

‎test/moonbit/moonbit_component_tests.bzl‎

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"""Analysis test rules for MoonBit WebAssembly components.
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This module provides testing for MoonBit component integration:
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- Analysis tests for moonbit_wasm_component rule
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- Provider validation for WasmComponentInfo with MoonBit-specific metadata
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- Signed integer type tests for upstream bug tracking (#1518)
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Related upstream issues:
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- bytecodealliance/wit-bindgen#1518: s8/s16 lift corruption
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- bytecodealliance/wit-bindgen#1517: async, flags, Option<T> issues
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"""
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load("@bazel_skylib//lib:unittest.bzl", "analysistest", "asserts")
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load("@rules_wasm_component//providers:providers.bzl", "WasmComponentInfo")
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def _moonbit_component_analysis_test_impl(ctx):
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"""Test that moonbit_wasm_component provides correct WasmComponentInfo."""
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env = analysistest.begin(ctx)
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target_under_test = analysistest.target_under_test(env)
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# Check that target provides WasmComponentInfo
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asserts.true(
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env,
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WasmComponentInfo in target_under_test,
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"moonbit_wasm_component should provide WasmComponentInfo",
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)
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component_info = target_under_test[WasmComponentInfo]
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# Validate WASM file output
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asserts.true(
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env,
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hasattr(component_info, "wasm_file"),
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"WasmComponentInfo should have wasm_file field",
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)
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wasm_file = component_info.wasm_file
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asserts.true(
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env,
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wasm_file.basename.endswith(".wasm"),
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"wasm_file should have .wasm extension",
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)
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# MoonBit components should be "reactor" type (library component)
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asserts.true(
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env,
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hasattr(component_info, "component_type"),
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"WasmComponentInfo should have component_type field",
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)
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asserts.equals(
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env,
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component_info.component_type,
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"reactor",
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"MoonBit components should be type 'reactor'",
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)
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# Validate metadata contains MoonBit-specific information
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asserts.true(
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env,
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hasattr(component_info, "metadata"),
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"WasmComponentInfo should have metadata field",
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)
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metadata = component_info.metadata
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asserts.equals(
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env,
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metadata.get("language"),
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"moonbit",
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"Component metadata should indicate 'moonbit' language",
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)
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# Check DefaultInfo provides files
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default_info = target_under_test[DefaultInfo]
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files = default_info.files.to_list()
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asserts.true(
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env,
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len(files) > 0,
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"Target should provide output files",
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)
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# Check that the main WASM file is in the output
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wasm_files = [f for f in files if f.basename.endswith(".wasm")]
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asserts.true(
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env,
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len(wasm_files) > 0,
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"Target should provide .wasm output files",
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)
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return analysistest.end(env)
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moonbit_component_analysis_test = analysistest.make(_moonbit_component_analysis_test_impl)
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def _moonbit_signed_integers_test_impl(ctx):
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"""Test MoonBit component with signed integer types (s8, s16).
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This test validates that components using s8/s16 types build successfully.
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Note: The upstream bug (#1518) causes value corruption at runtime, not build time.
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This test catches build regressions; runtime testing requires wasmtime invocation.
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"""
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env = analysistest.begin(ctx)
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target_under_test = analysistest.target_under_test(env)
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# Check that target provides WasmComponentInfo
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asserts.true(
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env,
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WasmComponentInfo in target_under_test,
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"Signed integers component should provide WasmComponentInfo",
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)
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component_info = target_under_test[WasmComponentInfo]
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# Verify the component built successfully
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asserts.true(
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env,
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component_info.wasm_file.basename.endswith(".wasm"),
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"Component should produce .wasm file",
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)
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# Verify it's a reactor (library) component
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asserts.equals(
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env,
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component_info.component_type,
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"reactor",
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"Signed integers test should be a reactor component",
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)
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# Verify exports list includes the signed integer functions
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# Note: exports may be empty if WIT parsing is incomplete
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exports = component_info.exports
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if exports:
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# If exports are populated, verify we have the expected ones
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expected_exports = ["signed-integers"]
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for expected in expected_exports:
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asserts.true(
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env,
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expected in exports,
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"Component should export '{}'".format(expected),
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)
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return analysistest.end(env)
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moonbit_signed_integers_test = analysistest.make(_moonbit_signed_integers_test_impl)
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def moonbit_test_suite(name):
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"""Creates the MoonBit component test suite.
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Args:
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name: Name of the test suite target.
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"""
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native.test_suite(
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name = name,
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tests = [
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":moonbit_component_analysis_test",
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":signed_integers_analysis_test",
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],
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# MoonBit toolchain only available on darwin_arm64, linux_amd64, windows_amd64
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tags = ["manual"],
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)

‎test/moonbit/signed_integers.mbt‎

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/// MoonBit Signed Integer Test Component
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///
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/// Tests for wit-bindgen MoonBit s8/s16 lift corruption bug (upstream #1518).
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/// These functions should pass values through unchanged, but the bug causes
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/// s8 and s16 values to be corrupted when lifted from WASM to host.
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/// Identity for s8 - returns the same value.
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/// Expected: identity_s8(-1) == -1
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/// Bug: May return corrupted value due to lift issue.
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pub fn identity_s8(value : Int) -> Int {
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value
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}
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/// Identity for s16 - returns the same value.
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/// Expected: identity_s16(-1) == -1
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/// Bug: May return corrupted value due to lift issue.
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pub fn identity_s16(value : Int) -> Int {
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value
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}
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/// Identity for s32 - should work correctly (not affected by bug).
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pub fn identity_s32(value : Int) -> Int {
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value
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}
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/// Negate an s8 value.
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/// Expected: negate_s8(127) == -127
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pub fn negate_s8(value : Int) -> Int {
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-value
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}
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/// Negate an s16 value.
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/// Expected: negate_s16(32767) == -32767
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pub fn negate_s16(value : Int) -> Int {
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-value
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}
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/// Return minimum s8 value (-128).
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pub fn min_s8() -> Int {
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-128
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}
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/// Return maximum s8 value (127).
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pub fn max_s8() -> Int {
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127
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}
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/// Return minimum s16 value (-32768).
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pub fn min_s16() -> Int {
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-32768
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}
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/// Return maximum s16 value (32767).
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pub fn max_s16() -> Int {
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32767
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}

‎test/moonbit/signed_integers.wit‎

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package test:signed-integers@1.0.0;
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/// Test world for signed integer types.
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///
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/// This tests the wit-bindgen MoonBit s8/s16 lift corruption bug (upstream #1518).
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/// Values should round-trip correctly through component boundaries.
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world signed-integers {
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/// Identity function for s8 - should return the same value.
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/// Bug: wit-bindgen MoonBit corrupts s8 values during lift.
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export identity-s8: func(value: s8) -> s8;
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/// Identity function for s16 - should return the same value.
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/// Bug: wit-bindgen MoonBit corrupts s16 values during lift.
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export identity-s16: func(value: s16) -> s16;
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/// Identity function for s32 - should work correctly (not affected by bug).
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export identity-s32: func(value: s32) -> s32;
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/// Test negative values - where corruption is most visible.
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export negate-s8: func(value: s8) -> s8;
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export negate-s16: func(value: s16) -> s16;
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/// Test boundary values.
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export min-s8: func() -> s8;
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export max-s8: func() -> s8;
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export min-s16: func() -> s16;
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export max-s16: func() -> s16;
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}

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