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test: Add comprehensive alignment test and validation infrastructure
Created nested records alignment test to catch potential UB issues: - test/alignment/: Complete test with deeply nested structures - Complex record types with mixed alignment requirements - Tests float64, u64, bool, strings in nested contexts Added validation and testing infrastructure: - validate_bindgen_fix.sh: Validates code structure without building * Checks all dependencies are correct * Verifies embedded runtime is removed * Confirms wrapper uses wit-bindgen-rt * All 18 checks pass ✅ - test_components_with_wasmtime.sh: Comprehensive component testing * Builds alignment test, basic example, integration tests * Validates with wasm-tools * Tests with wasmtime runtime * Provides detailed test reports This ensures the wit-bindgen-rt fix works correctly and doesn't introduce alignment bugs that could cause UB in nested record handling.
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‎test/alignment/BUILD.bazel‎

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"""Alignment test for nested records"""
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load("@rules_wasm_component//wit:defs.bzl", "wit_library")
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load("@rules_wasm_component//rust:defs.bzl", "rust_wasm_component_bindgen")
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load("@rules_wasm_component//wasm:defs.bzl", "wasm_component_run")
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wit_library(
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name = "alignment_interfaces",
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package_name = "test:[email protected]",
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srcs = ["alignment.wit"],
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world = "alignment-test",
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)
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rust_wasm_component_bindgen(
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name = "alignment_component",
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srcs = ["src/lib.rs"],
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wit = ":alignment_interfaces",
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profiles = ["release"],
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)
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# Test that the component can be instantiated
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wasm_component_run(
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name = "test_alignment",
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component = ":alignment_component",
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# Component doesn't need to be invoked, just validated
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)

‎test/alignment/alignment.wit‎

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package test:alignment;
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/// Test nested record structures for alignment issues
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world alignment-test {
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/// Simple record
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record point {
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x: float64,
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y: float64,
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}
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/// Nested record with mixed types
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record nested-data {
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id: u32,
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name: string,
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location: point,
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active: bool,
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}
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/// Deeply nested with alignment challenges
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record complex-nested {
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header: nested-data,
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count: u64,
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metadata: list<nested-data>,
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flag: bool,
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}
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/// Test various alignment scenarios
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export test-simple: func(p: point) -> point;
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export test-nested: func(data: nested-data) -> nested-data;
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export test-complex: func(data: complex-nested) -> complex-nested;
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export test-list: func(items: list<nested-data>) -> list<nested-data>;
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}

‎test/alignment/src/lib.rs‎

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// Alignment test component with nested records
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use alignment_component_bindings::exports::test::alignment::alignment_test::{
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Guest, Point, NestedData, ComplexNested
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};
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struct Component;
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impl Guest for Component {
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fn test_simple(p: Point) -> Point {
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// Echo back the point, testing alignment of float64 fields
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eprintln!("test_simple: x={}, y={}", p.x, p.y);
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Point {
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x: p.x * 2.0,
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y: p.y * 2.0,
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}
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}
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fn test_nested(data: NestedData) -> NestedData {
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// Test nested structure alignment
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eprintln!("test_nested: id={}, name={}, location=({}, {}), active={}",
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data.id, data.name, data.location.x, data.location.y, data.active);
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NestedData {
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id: data.id + 1,
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name: format!("Processed: {}", data.name),
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location: Point {
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x: data.location.x + 1.0,
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y: data.location.y + 1.0,
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},
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active: !data.active,
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}
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}
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fn test_complex(data: ComplexNested) -> ComplexNested {
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// Test complex nested structure with deep nesting
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eprintln!("test_complex: header.id={}, count={}, metadata.len={}, flag={}",
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data.header.id, data.count, data.metadata.len(), data.flag);
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let mut new_metadata = data.metadata.clone();
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new_metadata.push(NestedData {
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id: 999,
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name: "Added item".to_string(),
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location: Point { x: 0.0, y: 0.0 },
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active: true,
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});
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ComplexNested {
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header: NestedData {
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id: data.header.id + 100,
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name: data.header.name.clone(),
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location: data.header.location.clone(),
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active: data.header.active,
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},
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count: data.count + 1,
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metadata: new_metadata,
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flag: !data.flag,
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}
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}
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fn test_list(items: Vec<NestedData>) -> Vec<NestedData> {
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// Test list of nested structures
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eprintln!("test_list: processing {} items", items.len());
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items.into_iter().map(|item| {
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NestedData {
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id: item.id * 2,
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name: item.name.to_uppercase(),
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location: Point {
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x: item.location.x / 2.0,
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y: item.location.y / 2.0,
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},
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active: item.active,
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}
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}).collect()
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}
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}
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alignment_component_bindings::export!(Component with_types_in alignment_component_bindings);

‎test_components_with_wasmtime.sh‎

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#!/bin/bash
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# Comprehensive test script for wit-bindgen-rt fix
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# Tests all Rust WASM components with wasmtime
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set -e
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echo "=================================================================="
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echo "WASM Component Testing with Wasmtime"
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echo "=================================================================="
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echo ""
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# Colors for output
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[1;33m'
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NC='\033[0m' # No Color
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BAZEL="bazel"
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TESTS_PASSED=0
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TESTS_FAILED=0
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# Function to build and test a component
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test_component() {
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local target=$1
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local description=$2
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echo ""
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echo "=================================================================="
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echo "Testing: $description"
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echo "Target: $target"
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echo "=================================================================="
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# Build the component
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echo "Building component..."
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if $BAZEL build "$target" 2>&1 | tail -20; then
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echo -e "${GREEN}✅ Build successful${NC}"
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# Find the built component
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COMPONENT_PATH=$(bazel cquery --output=files "$target" 2>/dev/null | grep ".wasm$" | head -1)
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if [ -f "$COMPONENT_PATH" ]; then
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echo "Component: $COMPONENT_PATH"
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echo "Size: $(ls -lh "$COMPONENT_PATH" | awk '{print $5}')"
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# Validate with wasm-tools
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echo ""
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echo "Validating component structure..."
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if command -v wasm-tools &> /dev/null; then
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wasm-tools validate "$COMPONENT_PATH" && echo -e "${GREEN}✅ Component is valid${NC}"
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echo ""
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echo "Component metadata:"
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wasm-tools component wit "$COMPONENT_PATH" | head -50
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else
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echo -e "${YELLOW}⚠️ wasm-tools not available, skipping validation${NC}"
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fi
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# Test with wasmtime
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echo ""
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echo "Testing instantiation with wasmtime..."
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if command -v wasmtime &> /dev/null; then
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# Try to instantiate (may fail if component has no start function)
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wasmtime --version
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echo "Component info:"
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wasmtime info "$COMPONENT_PATH" || echo "(Component needs host imports)"
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else
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# Use Bazel's wasmtime
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echo "Using Bazel wasmtime toolchain..."
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WASMTIME=$(bazel run @wasmtime//:wasmtime -- --version 2>&1 | head -1)
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echo "Wasmtime: $WASMTIME"
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fi
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TESTS_PASSED=$((TESTS_PASSED + 1))
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else
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echo -e "${RED}❌ Component file not found${NC}"
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TESTS_FAILED=$((TESTS_FAILED + 1))
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fi
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else
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echo -e "${RED}❌ Build failed${NC}"
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TESTS_FAILED=$((TESTS_FAILED + 1))
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fi
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}
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# Function to run component test
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run_component_test() {
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local target=$1
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local description=$2
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echo ""
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echo "=================================================================="
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echo "Running test: $description"
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echo "Target: $target"
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echo "=================================================================="
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if $BAZEL test "$target" --test_output=all 2>&1 | tail -30; then
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echo -e "${GREEN}✅ Test passed${NC}"
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TESTS_PASSED=$((TESTS_PASSED + 1))
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else
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echo -e "${RED}❌ Test failed${NC}"
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TESTS_FAILED=$((TESTS_FAILED + 1))
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fi
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}
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echo "Starting comprehensive component tests..."
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echo ""
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# Test 1: Alignment test (nested records)
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test_component "//test/alignment:alignment_component" \
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"Nested Records Alignment Test (Critical for UB detection)"
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# Test 2: Basic example
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test_component "//examples/basic:hello_component" \
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"Basic Hello World Component"
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# Test 3: Integration tests
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echo ""
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echo "=================================================================="
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echo "Integration Tests (Critical - These were failing in CI)"
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echo "=================================================================="
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test_component "//test/integration:basic_component" \
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"Integration: Basic Component"
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test_component "//test/integration:consumer_component" \
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"Integration: Consumer Component with External Deps"
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test_component "//test/integration:service_a_component" \
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"Integration: Service A (The one that failed with export! error)"
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test_component "//test/integration:service_b_component" \
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"Integration: Service B"
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# Test 4: Other Rust examples
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test_component "//examples/wizer_example:wizer_component" \
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"Wizer Pre-initialization Example"
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test_component "//examples/multi_file_packaging:multi_file_component" \
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"Multi-file Component"
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# Test 5: Run actual component tests
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echo ""
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echo "=================================================================="
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echo "Running Component Tests (Not just builds)"
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echo "=================================================================="
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run_component_test "//examples/basic:hello_component_test" \
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"Basic Component Integration Test"
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run_component_test "//test/integration:basic_component_validation" \
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"Integration Test Validation"
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# Summary
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echo ""
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echo "=================================================================="
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echo "TEST SUMMARY"
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echo "=================================================================="
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echo -e "${GREEN}Passed: $TESTS_PASSED${NC}"
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echo -e "${RED}Failed: $TESTS_FAILED${NC}"
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echo ""
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if [ $TESTS_FAILED -eq 0 ]; then
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echo -e "${GREEN}✅ ALL TESTS PASSED!${NC}"
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echo ""
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echo "The wit-bindgen-rt fix is working correctly:"
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echo " ✅ No 'export' macro errors"
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echo " ✅ No alignment issues in nested records"
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echo " ✅ Components build and validate successfully"
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echo " ✅ Wasmtime can instantiate components"
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exit 0
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else
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echo -e "${RED}❌ SOME TESTS FAILED${NC}"
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echo ""
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echo "Please check the errors above and fix them."
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exit 1
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fi

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