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Commit ca15c536 authored by Martin Geisler's avatar Martin Geisler Committed by Automerger Merge Worker
Browse files

Merge "pdl: enable snapshot testing via ‘cargo test’" am: da8c9c52 am:... 

Merge "pdl: enable snapshot testing via ‘cargo test’" am: da8c9c52 am: e2cc0c33 am: 875131f5 am: 77a7f4ef am: 2c504cb7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2098984



Change-Id: I415ef6897c1fd3c76f8aa7617fe2b74f4c34f352
Signed-off-by: default avatarAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
parents cef2f21f 2c504cb7

tools/pdl/Android.bp

+4 −0
Original line number Diff line number Diff line
@@ -47,6 +47,10 @@ rust_test_host { 
    data: [

        ":rustfmt",

        ":rustfmt.toml",

        "test/generated/preamble.rs",

        "test/generated/packet_decl_empty.rs",

        "test/generated/packet_decl_simple_little_endian.rs",

        "test/generated/packet_decl_simple_big_endian.rs",

    ],

}

tools/pdl/src/generator.rs

+11 −9
Original line number Diff line number Diff line
@@ -556,7 +556,7 @@ mod tests { 
    use super::*;

    use crate::ast;

    use crate::parser::parse_inline;

    use crate::test_utils::{assert_eq_with_diff, rustfmt};

    use crate::test_utils::{assert_snapshot_eq, rustfmt};



    /// Parse a string fragment as a PDL file.

    ///
@@ -571,8 +571,7 @@ mod tests { 
    #[test]

    fn test_generate_preamble() {

        let actual_code = generate_preamble(Path::new("some/path/foo.pdl")).unwrap();

        let expected_code = include_str!("../test/generated/preamble.rs");

        assert_eq_with_diff(&rustfmt(expected_code), &rustfmt(&actual_code));

        assert_snapshot_eq("test/generated/preamble.rs", &rustfmt(&actual_code));

    }



    #[test]
@@ -587,8 +586,7 @@ mod tests { 
        let children = HashMap::new();

        let decl = &grammar.declarations[0];

        let actual_code = generate_decl(&grammar, &packets, &children, decl).unwrap();

        let expected_code = include_str!("../test/generated/packet_decl_empty.rs");

        assert_eq_with_diff(&rustfmt(expected_code), &rustfmt(&actual_code));

        assert_snapshot_eq("test/generated/packet_decl_empty.rs", &rustfmt(&actual_code));

    }



    #[test]
@@ -607,8 +605,10 @@ mod tests { 
        let children = HashMap::new();

        let decl = &grammar.declarations[0];

        let actual_code = generate_decl(&grammar, &packets, &children, decl).unwrap();

        let expected_code = include_str!("../test/generated/packet_decl_simple_little_endian.rs");

        assert_eq_with_diff(&rustfmt(expected_code), &rustfmt(&actual_code));

        assert_snapshot_eq(

            "test/generated/packet_decl_simple_little_endian.rs",

            &rustfmt(&actual_code),

        );

    }



    #[test]
@@ -627,7 +627,9 @@ mod tests { 
        let children = HashMap::new();

        let decl = &grammar.declarations[0];

        let actual_code = generate_decl(&grammar, &packets, &children, decl).unwrap();

        let expected_code = include_str!("../test/generated/packet_decl_simple_big_endian.rs");

        assert_eq_with_diff(&rustfmt(expected_code), &rustfmt(&actual_code));

        assert_snapshot_eq(

            "test/generated/packet_decl_simple_big_endian.rs",

            &rustfmt(&actual_code),

        );

    }

}

tools/pdl/src/test_utils.rs

+51 −0
Original line number Diff line number Diff line
@@ -5,7 +5,9 @@ 
// rest of the `pdl` crate. To make this work, avoid `use crate::`

// statements below.



use std::fs;

use std::io::Write;

use std::path::Path;

use std::process::{Command, Stdio};

use tempfile::NamedTempFile;
@@ -95,3 +97,52 @@ pub fn diff(left: &str, right: &str) -> String { 
pub fn assert_eq_with_diff(left: &str, right: &str) {

    assert!(left == right, "texts did not match, diff:\n{}\n", diff(left, right));

}



/// Compare a string with a snapshot file.

///

/// The `snapshot_path` is relative to the current working directory

/// of the test binary. This depends on how you execute the tests:

///

/// * When using `atest`: The current working directory is a random

///   temporary directory. You need to ensure that the snapshot file

///   is installed into this directory. You do this by adding the

///   snapshot to the `data` attribute of your test rule

///

/// * When using Cargo: The current working directory is set to

///   `CARGO_MANIFEST_DIR`, which is where the `Cargo.toml` file is

///   found.

///

/// If you run the test with Cargo and the `UPDATE_SNAPSHOTS`

/// environment variable is set, then the `actual_content` will be

/// written to `snapshot_path`. Otherwise the content is compared and

/// a panic is triggered if they differ.

#[track_caller]

pub fn assert_snapshot_eq<P: AsRef<Path>>(snapshot_path: P, actual_content: &str) {

    let snapshot = snapshot_path.as_ref();

    let snapshot_content = fs::read(&snapshot).unwrap_or_else(|err| {

        panic!("Could not read snapshot from {}: {}", snapshot.display(), err)

    });

    let snapshot_content = String::from_utf8(snapshot_content).expect("Snapshot was not UTF-8");



    // Normal comparison if UPDATE_SNAPSHOTS is unset.

    if std::env::var("UPDATE_SNAPSHOTS").is_err() {

        return assert_eq_with_diff(&snapshot_content, actual_content);

    }



    // Bail out if we are not using Cargo.

    if std::env::var("CARGO_MANIFEST_DIR").is_err() {

        panic!("Please unset UPDATE_SNAPSHOTS if you are not using Cargo");

    }



    if actual_content != snapshot_content {

        eprintln!(

            "Updating snapshot {}: {} -> {} bytes",

            snapshot.display(),

            snapshot_content.len(),

            actual_content.len()

        );

        fs::write(&snapshot_path, actual_content).unwrap_or_else(|err| {

            panic!("Could not write snapshot to {}: {}", snapshot.display(), err)

        });

    }

}

tools/pdl/test/pdl_tests.rs

+4 −1
Original line number Diff line number Diff line
@@ -4,9 +4,12 @@ use std::process::Command; 
// The integration test in this file is not part of the pdl crate, and

// so we cannot directly depend on anything from pdl. However, we can

// include the test_utils.rs file directly.

//

// The module is public to avoid an "function is never used" error,

// which is triggered because we don't use all test_utils functions.



#[path = "../src/test_utils.rs"]

mod test_utils;

pub mod test_utils;

use test_utils::{assert_eq_with_diff, find_binary, rustfmt};



fn strip_blank_lines(text: &str) -> String {