fn test_llvm_aggregate_profraws()

in src/llvm_tools.rs [444:523]

• 67 lines of code
• 4 McCabe index (conditional complexity)

    fn test_llvm_aggregate_profraws() {
        if !check_nightly_rust() {
            return;
        }

        let tmp_dir = copy_fixture("hello_name");
        let tmp_path = tmp_dir.path();
        let bin_path = get_binary_path("hello_name");

        let path_without = tmp_path.join("without-arg.profraw");
        let path_with = tmp_path.join("with-arg.profraw");

        // Run the program twice:
        // - Once without arguments,
        // - Once with a simple argument to enter the other side of the if.
        let status = Command::new("cargo")
            .arg("run")
            .env("RUSTFLAGS", "-Cinstrument-coverage")
            .env("LLVM_PROFILE_FILE", &path_without)
            .current_dir(tmp_path)
            .status()
            .expect("Failed to build");
        assert!(status.success(), "Error when running `cargo run`");

        let status = Command::new("cargo")
            .arg("run")
            .arg("--")
            .arg("John")
            .env("RUSTFLAGS", "-Cinstrument-coverage")
            .env("LLVM_PROFILE_FILE", &path_with)
            .current_dir(tmp_path)
            .status()
            .expect("Failed to build");
        assert!(status.success(), "Error when running `cargo run`");

        let lcovs = llvm_profiles_to_lcov(
            &[path_with, path_without],
            &tmp_path.join(bin_path),
            tmp_path,
        );

        assert!(lcovs.is_ok(), "Error: {}", lcovs.unwrap_err());
        let lcovs = lcovs.unwrap();
        assert_eq!(lcovs.len(), 1);
        let output_lcov = String::from_utf8_lossy(&lcovs[0]);
        println!("{}", output_lcov);

        let lcov = String::from_utf8_lossy(&lcovs[0]);

        let lcov_entries = [
            "FNF:1",  // # of function found
            "FNH:1",  // # of function hit
            "DA:1,2", // Line 1 hit 2 times
            "DA:2,2", // Line 2 hit 2 times
            "DA:3,1", // Line 3 hit 1 time
            "DA:4,1", // Line 4 hit 1 time
            "DA:5,1", // Line 5 hit 1 time
            "DA:6,1", // Line 6 hit 1 time
            "DA:7,2", // Line 7 hit 2 time
            "BRF:0",  // # of branch found
            "BRH:0",  // # of branch hit
            "LF:7",   // # of line found
            "LH:7",   // # of line hit
        ];

        for entry in lcov_entries {
            assert!(lcov.contains(&format!("{entry}\n")));
        }

        let main_path = tmp_path
            .join("src")
            .join("main.rs")
            .to_string_lossy()
            .into_owned();
        assert!(
            lcov.lines()
                .any(|line| line.contains("SF:") && line.contains(&main_path)),
            "Missing source file declaration (SF) in lcov report",
        );
    }