build.rs

        {
            let mut file = std::fs::File::create(&path).unwrap();
            file.write_all(content.as_bytes())
                .expect("writing of executable failed");
        }
        std::fs::set_permissions(&path, std::fs::Permissions::from_mode(0o777))
            .expect("setting permissions failed");
    }

    /// Creates an executable `wasm-opt-mocked` file which outputs
    /// "wasm-opt version `version`".
    ///
    /// Returns the path to this file.
    ///
    /// Currently works only on `unix`.
    #[cfg(unix)]
    fn mock_wasm_opt_version(tmp_dir: &Path, version: &str) -> PathBuf {
        let path = tmp_dir.join("wasm-opt-mocked");
        let content = format!("#!/bin/sh\necho \"wasm-opt version {}\"", version);
        create_executable(&path, &content);
        path
    }

    #[test]
    fn build_code_only() {
        with_new_contract_project(|manifest_path| {
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                build_mode: BuildMode::Release,
                build_artifact: BuildArtifacts::CodeOnly,
                ..Default::default()
            };

            let res = super::execute(args).expect("build failed");

            // our ci has set `CARGO_TARGET_DIR` to cache artifacts.
            // this dir does not include `/target/` as a path, hence
            // we can't match for e.g. `foo_project/target/ink`.
            //
            // we also can't match for `/ink` here, since this would match
            // for `/ink` being the root path.
            assert!(res.target_directory.ends_with("ink"));

            assert!(
                res.metadata_result.is_none(),
                "CodeOnly should not generate the metadata"
            );

            let optimized_size = res.optimization_result.unwrap().optimized_size;
            assert!(optimized_size > 0.0);

            // our optimized contract template should always be below 3k.
            assert!(optimized_size < 3.0);

            // we specified that debug symbols should be removed
            // original code should have some but the optimized version should have them removed
            assert!(!has_debug_symbols(&res.dest_wasm.unwrap()));

            Ok(())
        })
    }

    #[test]
    fn check_must_not_output_contract_artifacts_in_project_dir() {
        with_new_contract_project(|manifest_path| {
            // given
            let project_dir = manifest_path.directory().expect("directory must exist");
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path: manifest_path.clone(),
                build_artifact: BuildArtifacts::CheckOnly,
                ..Default::default()
            };

            // when
            super::execute(args).expect("build failed");

            // then
            assert!(
                !project_dir.join("target/ink/new_project.contract").exists(),
                "found contract artifact in project directory!"
            );
            assert!(
                !project_dir.join("target/ink/new_project.wasm").exists(),
                "found wasm artifact in project directory!"
            );
            Ok(())
        })
    }

    #[test]
    fn optimization_passes_from_cli_must_take_precedence_over_profile() {
        with_new_contract_project(|manifest_path| {
            // given
            write_optimization_passes_into_manifest(
                manifest_path.as_ref(),
                OptimizationPasses::Three,
            );
            let cmd = BuildCommand {
                manifest_path: Some(manifest_path.into()),
                build_artifact: BuildArtifacts::All,
                build_release: false,
                build_offline: false,
                verbosity: VerbosityFlags::default(),
                unstable_options: UnstableOptions::default(),

                // we choose zero optimization passes as the "cli" parameter
                optimization_passes: Some(OptimizationPasses::Zero),
                keep_debug_symbols: false,
                skip_linting: false,
                output_json: false,
            };

            // when
            let res = cmd.exec().expect("build failed");
            let optimization = res
                .optimization_result
                .expect("no optimization result available");

            // then
            // The size does not exactly match the original size even without optimization
            // passed because there is still some post processing happening.
            let size_diff = optimization.original_size - optimization.optimized_size;
            assert!(
                0.0 < size_diff && size_diff < 10.0,
                "The optimized size savings are larger than allowed or negative: {}",
                size_diff,
            );
            Ok(())
        })
    }

    #[test]
    fn optimization_passes_from_profile_must_be_used() {
        with_new_contract_project(|manifest_path| {
            // given
            write_optimization_passes_into_manifest(
                manifest_path.as_ref(),
                OptimizationPasses::Three,
            );
            let cmd = BuildCommand {
                manifest_path: Some(manifest_path.into()),
                build_artifact: BuildArtifacts::All,
                build_release: false,
                build_offline: false,
                verbosity: VerbosityFlags::default(),
                unstable_options: UnstableOptions::default(),

                // we choose no optimization passes as the "cli" parameter
                optimization_passes: None,
                keep_debug_symbols: false,
                skip_linting: false,
                output_json: false,
            };

            // when
            let res = cmd.exec().expect("build failed");
            let optimization = res
                .optimization_result
                .expect("no optimization result available");

            // then
            // The size does not exactly match the original size even without optimization
            // passed because there is still some post processing happening.
            let size_diff = optimization.original_size - optimization.optimized_size;
            assert!(
                size_diff > (optimization.original_size / 2.0),
                "The optimized size savings are too small: {}",
                size_diff,
            );

            Ok(())
        })
    }

    #[test]
    fn project_template_dependencies_must_be_ink_compatible() {
        with_new_contract_project(|manifest_path| {
            // given
            // the manifest path

            // when
            let res =
                assert_compatible_ink_dependencies(&manifest_path, Verbosity::Default);

            // then
            assert!(res.is_ok());
            Ok(())
        })
    }

    #[test]
    fn detect_mismatching_parity_scale_codec_dependencies() {
        with_new_contract_project(|manifest_path| {
            // given
            // the manifest path

            // at the time of writing this test ink! already uses `parity-scale-codec`
            // in a version > 2, hence 1 is an incompatible version.
            let mut manifest = Manifest::new(manifest_path.clone())?;
            manifest
                .set_dependency_version("scale", "1.0.0")
                .expect("setting `scale` version failed");
            manifest
                .write(&manifest_path)
                .expect("writing manifest failed");

            // when
            let res =
                assert_compatible_ink_dependencies(&manifest_path, Verbosity::Default);

            // then
            assert!(res.is_err());
            Ok(())
        })
    }

    #[cfg(unix)]
    #[test]
    fn incompatible_wasm_opt_version_must_be_detected_if_built_from_repo() {
        with_tmp_dir(|path| {
            // given
            let path = mock_wasm_opt_version(path, "98 (version_13-79-gc12cc3f50)");

            // when
            let res = check_wasm_opt_version_compatibility(&path);

            // then
            assert!(res.is_err());
            assert!(
                format!("{:?}", res).starts_with(
                    "Err(Your wasm-opt version is 98, but we require a version >= 99."
                ),
                "Expected a different output, found {:?}",
                res
            );

            Ok(())
        })
    }

    #[cfg(unix)]
    #[test]
    fn compatible_wasm_opt_version_must_be_detected_if_built_from_repo() {
        with_tmp_dir(|path| {
            // given
            let path = mock_wasm_opt_version(path, "99 (version_99-79-gc12cc3f50");

            // when
            let res = check_wasm_opt_version_compatibility(&path);

            // then
            assert!(res.is_ok());

            Ok(())
        })
    }

    #[cfg(unix)]
    #[test]
    fn incompatible_wasm_opt_version_must_be_detected_if_installed_as_package() {
        with_tmp_dir(|path| {
            // given
            let path = mock_wasm_opt_version(path, "98");

            // when
            let res = check_wasm_opt_version_compatibility(&path);

            // then
            assert!(res.is_err());

            // this println is here to debug a spuriously failing CI at the following assert.
            eprintln!("error: {:?}", res);
            assert!(format!("{:?}", res).starts_with(
                "Err(Your wasm-opt version is 98, but we require a version >= 99."
            ));

            Ok(())
        })
    }

    #[cfg(unix)]
    #[test]
    fn compatible_wasm_opt_version_must_be_detected_if_installed_as_package() {
        with_tmp_dir(|path| {
            // given
            let path = mock_wasm_opt_version(path, "99");

            // when
            let res = check_wasm_opt_version_compatibility(&path);

            // then
            assert!(res.is_ok());

            Ok(())
        })
    }

    #[test]
    fn contract_lib_name_different_from_package_name_must_build() {
        with_new_contract_project(|manifest_path| {
            // given
            let mut manifest =
                Manifest::new(manifest_path.clone()).expect("manifest creation failed");
            let _ = manifest
                .set_lib_name("some_lib_name")
                .expect("setting lib name failed");
            let _ = manifest
                .set_package_name("some_package_name")
                .expect("setting pacakge name failed");
            manifest
                .write(&manifest_path)
                .expect("writing manifest failed");

            // when
            let cmd = BuildCommand {
                manifest_path: Some(manifest_path.into()),
                build_artifact: BuildArtifacts::All,
                build_release: false,
                build_offline: false,
                verbosity: VerbosityFlags::default(),
                unstable_options: UnstableOptions::default(),
                optimization_passes: None,
                keep_debug_symbols: false,
                skip_linting: false,
                output_json: false,
            };
            let res = cmd.exec().expect("build failed");

            // then
            assert_eq!(
                res.dest_wasm
                    .expect("`dest_wasm` does not exist")
                    .file_name(),
                Some(OsStr::new("some_lib_name.wasm"))
            );

            Ok(())
        })
    }

    #[test]
    pub fn debug_mode_must_be_compatible() {
        let _ = assert_debug_mode_supported(
            &Version::parse("3.0.0-rc4").expect("parsing must work"),
        )
        .expect("debug mode must be compatible");
        let _ = assert_debug_mode_supported(
            &Version::parse("4.0.0-rc1").expect("parsing must work"),
        )
        .expect("debug mode must be compatible");
        let _ = assert_debug_mode_supported(
            &Version::parse("5.0.0").expect("parsing must work"),
        )
        .expect("debug mode must be compatible");
    }

    #[test]
    pub fn debug_mode_must_be_incompatible() {
        let res = assert_debug_mode_supported(
            &Version::parse("3.0.0-rc3").expect("parsing must work"),
        )
        .expect_err("assertion must fail");
        assert_eq!(
            res.to_string(),
            "Building the contract in debug mode requires an ink! version newer than `3.0.0-rc3`!"
        );
    }

    #[test]
    fn building_template_in_debug_mode_must_work() {
        with_new_contract_project(|manifest_path| {
            // given
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                build_mode: BuildMode::Debug,
                ..Default::default()
            };

            // when
            let res = super::execute(args);

            // then
            assert!(res.is_ok(), "building template in debug mode failed!");
            Ok(())
        })
    }

    #[test]
    fn building_template_in_release_mode_must_work() {
        with_new_contract_project(|manifest_path| {
            // given
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                build_mode: BuildMode::Release,
                ..Default::default()
            };

            // when
            let res = super::execute(args);

            // then
            assert!(res.is_ok(), "building template in release mode failed!");
            Ok(())
        })
    }

    #[test]
    fn building_contract_with_source_file_in_subfolder_must_work() {
        with_new_contract_project(|manifest_path| {
            // given
            let path = manifest_path.directory().expect("dir must exist");
            let old_lib_path = path.join(Path::new("lib.rs"));
            let new_lib_path = path.join(Path::new("srcfoo")).join(Path::new("lib.rs"));
            let new_dir_path = path.join(Path::new("srcfoo"));
            std::fs::create_dir_all(new_dir_path).expect("creating dir must work");
            std::fs::rename(old_lib_path, new_lib_path).expect("moving file must work");

            let mut manifest = Manifest::new(manifest_path.clone())
                .expect("creating manifest must work");
            manifest
                .set_lib_path("srcfoo/lib.rs")
                .expect("setting lib path must work");
            manifest.write(&manifest_path).expect("writing must work");

            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                build_artifact: BuildArtifacts::CheckOnly,
                ..Default::default()
            };

            // when
            let res = super::execute(args);

            // then
            assert!(res.is_ok(), "building contract failed!");
            Ok(())
        })
    }

    #[test]
    fn keep_debug_symbols_in_debug_mode() {
        with_new_contract_project(|manifest_path| {
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                build_mode: BuildMode::Debug,
                build_artifact: BuildArtifacts::CodeOnly,
                keep_debug_symbols: true,
                ..Default::default()
            };

            let res = super::execute(args).expect("build failed");

            // we specified that debug symbols should be kept
            assert!(has_debug_symbols(&res.dest_wasm.unwrap()));

            Ok(())
        })
    }

    #[test]
    fn keep_debug_symbols_in_release_mode() {
        with_new_contract_project(|manifest_path| {
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                build_mode: BuildMode::Release,
                build_artifact: BuildArtifacts::CodeOnly,
                keep_debug_symbols: true,
                ..Default::default()
            };

            let res = super::execute(args).expect("build failed");

            // we specified that debug symbols should be kept
            assert!(has_debug_symbols(&res.dest_wasm.unwrap()));

            Ok(())
        })
    }

    #[test]
    fn build_with_json_output_works() {
        with_new_contract_project(|manifest_path| {
            // given
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                output_type: OutputType::Json,
                ..Default::default()
            };

            // when
            let res = super::execute(args).expect("build failed");

            // then
            assert!(res.serialize_json().is_ok());
            Ok(())
        })
    }

    // This test has to be ignored until the next ink! rc.
    // Before that we don't have the `__ink_dylint_…` markers available
    // to actually run `dylint`.
    #[test]
    #[ignore]
    fn dylint_must_find_issue() {
        with_new_contract_project(|manifest_path| {
            // given
            let contract = r#"
            #![cfg_attr(not(feature = "std"), no_std)]

            use ink_lang as ink;

            #[ink::contract]
            mod fail_mapping_01 {
                use ink_storage::{traits::SpreadAllocate, Mapping};

                #[ink(storage)]
                #[derive(SpreadAllocate)]
                pub struct MyContract {
                    balances: Mapping<AccountId, Balance>,
                }

                impl MyContract {
                    #[ink(constructor)]
                    pub fn new() -> Self {
                        Self {
                            balances: Default::default(),
                        }
                    }

                    /// Returns the total token supply.
                    #[ink(message)]
                    pub fn get(&self) {
                        // ...
                    }
                }
            }"#;
            let project_dir = manifest_path.directory().expect("directory must exist");
            let lib = project_dir.join("lib.rs");
            std::fs::write(&lib, contract)?;

            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                build_artifact: BuildArtifacts::CheckOnly,
                ..Default::default()
            };

            // when
            let res = super::execute(args);

            // then
            match res {
                Err(err) => {
                    eprintln!("err: {:?}", err);
                    assert!(err.to_string().contains(
                        "help: add an `initialize_contract` function in this constructor"
                    ));
                }
                _ => panic!("build succeeded, but must fail!"),
            };
            Ok(())
        })
    }

    #[cfg(unix)]
    #[test]
    fn missing_cargo_dylint_installation_must_be_detected() {
        with_new_contract_project(|manifest_path| {
            // given
            let manifest_dir = manifest_path.directory().unwrap();

            // mock existing `dylint-link` binary
            create_executable(&manifest_dir.join("dylint-link"), "#!/bin/sh\nexit 0");

            // mock a non-existing `cargo dylint` installation.
            create_executable(&manifest_dir.join("cargo"), "#!/bin/sh\nexit 1");

            // when
            let args = crate::cmd::build::ExecuteArgs {
                manifest_path,
                ..Default::default()
            };
            let res = super::execute(args).map(|_| ()).unwrap_err();

            // then
            assert!(format!("{:?}", res).contains("cargo-dylint was not found!"));

            Ok(())
        })
    }
}