61 lines
1.9 KiB
Rust
61 lines
1.9 KiB
Rust
use anyhow::{Context, Result};
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use pretty_assertions::assert_eq;
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use std::fs;
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use wit_component::InterfaceEncoder;
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use wit_parser::Interface;
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/// Tests the encoding of individual interface files.
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///
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/// This test looks in the `interfaces/` directory for test cases.
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///
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/// Each test case is a directory containing a `<testcase>.wit` file
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/// and an expected `<testcase>.wat` file.
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///
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/// The test encodes the wit file, prints the resulting component, and
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/// compares the output to the wat file.
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///
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/// Run the test with the environment variable `BLESS` set to update
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/// the wat baseline file.
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#[test]
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fn interface_encoding() -> Result<()> {
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for entry in fs::read_dir("tests/interfaces")? {
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let path = entry?.path();
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if !path.is_dir() {
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continue;
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}
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let test_case = path.file_stem().unwrap().to_str().unwrap();
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let wit_path = path.join(test_case).with_extension("wit");
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let interface = Interface::parse_file(&wit_path)?;
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let encoder = InterfaceEncoder::new(&interface).validate(true);
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let bytes = encoder.encode().with_context(|| {
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format!(
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"failed to encode a component from interface `{}` for test case `{}`",
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wit_path.display(),
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test_case,
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)
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})?;
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let output = wasmprinter::print_bytes(&bytes)?;
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let wat_path = wit_path.with_extension("wat");
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if std::env::var_os("BLESS").is_some() {
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fs::write(&wat_path, output)?;
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} else {
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assert_eq!(
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fs::read_to_string(&wat_path)?.replace("\r\n", "\n"),
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output,
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"encoding of wit file `{}` did not match the expected wat file `{}` for test case `{}`",
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wit_path.display(),
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wat_path.display(),
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test_case
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);
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}
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}
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Ok(())
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}
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