test/base-compiler-tests.ts

// Copyright (c) 2018, Compiler Explorer Authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

import {match, mock, restore, stub} from 'sinon';

import {BaseCompiler} from '../lib/base-compiler';
import {BuildEnvSetupBase} from '../lib/buildenvsetup';
import {CompilationEnvironment} from '../lib/compilation-env';
import {Win32Compiler} from '../lib/compilers/win32';
import * as exec from '../lib/exec';
import {CompilerInfo} from '../types/compiler.interfaces';

import {
    fs,
    makeCompilationEnvironment,
    makeFakeCompilerInfo,
    makeFakeParseFiltersAndOutputOptions,
    path,
    should,
    shouldExist,
} from './utils';

const languages = {
    'c++': {id: 'c++'},
} as const;

describe('Basic compiler invariants', function () {
    let ce: CompilationEnvironment;
    let compiler: BaseCompiler;

    const info: Partial<CompilerInfo> = {
        exe: '',
        remote: true,
        lang: 'c++',
        ldPath: [],
    };

    before(() => {
        ce = makeCompilationEnvironment({languages});
        compiler = new BaseCompiler(info as CompilerInfo, ce);
    });

    it('should recognize when optOutput has been request', () => {
        compiler.optOutputRequested(['please', 'recognize', '-fsave-optimization-record']).should.equal(true);
        compiler.optOutputRequested(['please', "don't", 'recognize']).should.equal(false);
    });
    // Overkill test, but now we're safer!
    it('should recognize cfg compilers', () => {
        compiler
            .isCfgCompiler(
                'clang version 5.0.0 (https://github.com/asutton/clang.git 449c8c3e91355a3b2b6761e11d9fb5d3c125b791) (https://github.com/llvm-mirror/llvm.git 40b1e969f9cb2a0c697e247435193fb006ef1311)',
            )
            .should.equal(true);
        compiler.isCfgCompiler('clang version 4.0.0 (tags/RELEASE_400/final 299826)').should.equal(true);
        compiler.isCfgCompiler('clang version 7.0.0 (trunk 325868)').should.equal(true);
        compiler.isCfgCompiler('clang version 3.3 (tags/RELEASE_33/final)').should.equal(true);
        compiler
            .isCfgCompiler('clang version 6.0.0 (tags/RELEASE_600/final 327031) (llvm/tags/RELEASE_600/final 327028)')
            .should.equal(true);

        compiler.isCfgCompiler('g++ (GCC-Explorer-Build) 4.9.4').should.equal(true);
        compiler.isCfgCompiler('g++ (GCC-Explorer-Build) 8.0.1 20180223 (experimental)').should.equal(true);
        compiler.isCfgCompiler('g++ (GCC-Explorer-Build) 8.0.1 20180223 (experimental)').should.equal(true);
        compiler.isCfgCompiler('g++ (GCC) 4.1.2').should.equal(true);

        compiler.isCfgCompiler('foo-bar-g++ (GCC-Explorer-Build) 4.9.4').should.equal(true);
        compiler.isCfgCompiler('foo-bar-gcc (GCC-Explorer-Build) 4.9.4').should.equal(true);
        compiler.isCfgCompiler('foo-bar-gdc (GCC-Explorer-Build) 4.9.4').should.equal(true);

        compiler.isCfgCompiler('fake-for-test (Based on g++)').should.equal(false);

        compiler.isCfgCompiler('gdc (crosstool-NG 203be35 - 20160205-2.066.1-e95a735b97) 5.2.0').should.equal(true);
        compiler
            .isCfgCompiler('gdc (crosstool-NG hg+unknown-20131212.080758 - 20140430-2.064.2-404a037d26) 4.8.2')
            .should.equal(true);
        compiler
            .isCfgCompiler('gdc (crosstool-NG crosstool-ng-1.20.0-232-gc746732 - 20150830-2.066.1-d0dd4a83de) 4.9.3')
            .should.equal(true);

        compiler.isCfgCompiler('fake-for-test (Based on gdc)').should.equal(false);
    });
    it('should allow comments next to includes (Bug #874)', () => {
        should.equal(compiler.checkSource('#include <cmath> // std::(sin, cos, ...)'), null);
        const badSource = compiler.checkSource('#include </dev/null..> //Muehehehe');
        if (shouldExist(badSource)) {
            badSource.should.equal('<stdin>:1:1: no absolute or relative includes please');
        }
    });
    it('should not warn of path-likes outside C++ includes (Bug #3045)', () => {
        function testIncludeG(text: string) {
            should.equal(compiler.checkSource(text), null);
        }
        testIncludeG('#include <iostream>');
        testIncludeG('#include <iostream>  // <..>');
        testIncludeG('#include <type_traits> // for std::is_same_v<...>');
        testIncludeG('#include <ranges>      // for std::ranges::range<...> and std::ranges::range_type_v<...>');
        testIncludeG('#include <https://godbolt.com> // /home/');
    });
    it('should not allow path C++ includes', () => {
        function testIncludeNotG(text: string) {
            should.equal(compiler.checkSource(text), '<stdin>:1:1: no absolute or relative includes please');
        }
        testIncludeNotG('#include <./.bashrc>');
        testIncludeNotG('#include </dev/null>  // <..>');
        testIncludeNotG('#include <../fish.config> // for std::is_same_v<...>');
        testIncludeNotG('#include <./>      // for std::ranges::range<...> and std::ranges::range_type_v<...>');
    });
    it('should skip version check if forced to', async () => {
        const newConfig: Partial<CompilerInfo> = {...info, explicitVersion: '123'};
        const forcedVersionCompiler = new BaseCompiler(newConfig as CompilerInfo, ce);
        const result = await forcedVersionCompiler.getVersion();
        result.stdout.should.deep.equal(['123']);
    });
});

describe('Compiler execution', function () {
    let ce: CompilationEnvironment;
    let compiler: BaseCompiler;
    let compilerNoExec: BaseCompiler;
    let win32compiler: Win32Compiler;

    const executingCompilerInfo = makeFakeCompilerInfo({
        remote: true,
        lang: 'c++',
        ldPath: [],
        libPath: [],
        supportsExecute: true,
        supportsBinary: true,
        options: '--hello-abc -I"/opt/some thing 1.0/include" -march="magic 8bit"',
    });
    const win32CompilerInfo = makeFakeCompilerInfo({
        remote: true,
        lang: 'c++',
        ldPath: [],
        supportsExecute: true,
        supportsBinary: true,
        options: '/std=c++17 /I"C:/program files (x86)/Company name/Compiler 1.2.3/include" /D "MAGIC=magic 8bit"',
    });
    const noExecuteSupportCompilerInfo = makeFakeCompilerInfo({
        remote: true,
        lang: 'c++',
        ldPath: [],
        libPath: [],
    });
    const someOptionsCompilerInfo = makeFakeCompilerInfo({
        remote: true,
        lang: 'c++',
        ldPath: [],
        libPath: [],
        supportsExecute: true,
        supportsBinary: true,
        options: '--hello-abc -I"/opt/some thing 1.0/include"',
    });

    before(() => {
        ce = makeCompilationEnvironment({languages});
        compiler = new BaseCompiler(executingCompilerInfo, ce);
        win32compiler = new Win32Compiler(win32CompilerInfo, ce);
        compilerNoExec = new BaseCompiler(noExecuteSupportCompilerInfo, ce);
    });

    afterEach(() => restore());

    function stubOutCallToExec(execStub, compiler, content, result, nthCall) {
        execStub.onCall(nthCall || 0).callsFake((compiler, args) => {
            const minusO = args.indexOf('-o');
            minusO.should.be.gte(0);
            const output = args[minusO + 1];
            // Maybe we should mock out the FS too; but that requires a lot more work.
            fs.writeFileSync(output, content);
            result.filenameTransform = (x: string) => x;
            return Promise.resolve(result);
        });
    }

    it('basecompiler should handle spaces in options correctly', () => {
        const userOptions = [];
        const filters = makeFakeParseFiltersAndOutputOptions({});
        const backendOptions = {};
        const inputFilename = 'example.cpp';
        const outputFilename = 'example.s';
        const libraries = [];

        const args = compiler.prepareArguments(
            userOptions,
            filters,
            backendOptions,
            inputFilename,
            outputFilename,
            libraries,
        );
        args.should.deep.equal([
            '-g',
            '-o',
            'example.s',
            '-S',
            '--hello-abc',
            '-I/opt/some thing 1.0/include',
            '-march=magic 8bit',
            'example.cpp',
        ]);
    });

    it('win32 compiler should handle spaces in options correctly', () => {
        const userOptions = [];
        const filters = makeFakeParseFiltersAndOutputOptions({});
        const backendOptions = {};
        const inputFilename = 'example.cpp';
        const outputFilename = 'example.s';
        const libraries = [];

        const win32args = win32compiler.prepareArguments(
            userOptions,
            filters,
            backendOptions,
            inputFilename,
            outputFilename,
            libraries,
        );
        win32args.should.deep.equal([
            '/nologo',
            '/FA',
            '/c',
            '/Faexample.s',
            '/Foexample.s.obj',
            '/std=c++17',
            '/IC:/program files (x86)/Company name/Compiler 1.2.3/include',
            '/D',
            'MAGIC=magic 8bit',
            'example.cpp',
        ]);
    });

    it('buildenv should handle spaces correctly', () => {
        const buildenv = new BuildEnvSetupBase(executingCompilerInfo, ce);
        buildenv.getCompilerArch().should.equal('magic 8bit');
    });

    it('buildenv compiler without target/march', () => {
        const buildenv = new BuildEnvSetupBase(noExecuteSupportCompilerInfo, ce);
        buildenv.getCompilerArch().should.equal(false);
        buildenv.compilerSupportsX86.should.equal(true);
    });

    it('buildenv compiler without target/march but with options', () => {
        const buildenv = new BuildEnvSetupBase(someOptionsCompilerInfo, ce);
        buildenv.getCompilerArch().should.equal(false);
        buildenv.compilerSupportsX86.should.equal(true);
    });

    it('should compile', async () => {
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(
            execStub,
            compiler,
            'This is the output file',
            {
                code: 0,
                okToCache: true,
                stdout: 'stdout',
                stderr: 'stderr',
            },
            undefined,
        );
        const result = await compiler.compile('source', 'options', {}, {}, false, [], {}, [], undefined);
        result.code.should.equal(0);
        result.compilationOptions.should.contain('options');
        result.compilationOptions.should.contain(result.inputFilename);
        result.okToCache.should.be.true;
        result.asm.should.deep.equal([{source: null, text: 'This is the output file', labels: []}]);
        result.stdout.should.deep.equal([{text: 'stdout'}]);
        result.stderr.should.deep.equal([{text: 'stderr'}]);
        result.popularArguments.should.deep.equal({});
        result.tools.should.deep.equal([]);
        execStub.called.should.be.true;
    });

    it('should handle compilation failures', async () => {
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(
            execStub,
            compiler,
            'This is the output file',
            {
                code: 1,
                okToCache: true,
                stdout: '',
                stderr: 'oh noes',
            },
            undefined,
        );
        const result = await compiler.compile('source', 'options', {}, {}, false, [], {}, [], undefined);
        result.code.should.equal(1);
        result.asm.should.deep.equal([{labels: [], source: null, text: '<Compilation failed>'}]);
    });

    it('should cache results (when asked)', async () => {
        const ceMock = mock(ce);
        const fakeExecResults = {
            code: 0,
            okToCache: true,
            stdout: 'stdout',
            stderr: 'stderr',
        };
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(execStub, compiler, 'This is the output file', fakeExecResults, undefined);
        const source = 'Some cacheable source';
        const options = 'Some cacheable options';
        ceMock
            .expects('cachePut')
            .withArgs(
                match({source, options}),
                match({
                    ...fakeExecResults,
                    stdout: [{text: 'stdout'}],
                    stderr: [{text: 'stderr'}],
                }),
            )
            .resolves();
        const uncachedResult = await compiler.compile(source, options, {}, {}, false, [], {}, [], undefined);
        uncachedResult.code.should.equal(0);
        ceMock.verify();
    });

    it('should not cache results (when not asked)', async () => {
        const ceMock = mock(ce);
        const fakeExecResults = {
            code: 0,
            okToCache: false,
            stdout: 'stdout',
            stderr: 'stderr',
        };
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(execStub, compiler, 'This is the output file', fakeExecResults, undefined);
        ceMock.expects('cachePut').never();
        const source = 'Some cacheable source';
        const options = 'Some cacheable options';
        const uncachedResult = await compiler.compile(source, options, {}, {}, false, [], {}, [], undefined);
        uncachedResult.code.should.equal(0);
        ceMock.verify();
    });

    it('should read from the cache (when asked)', async () => {
        const ceMock = mock(ce);
        const source = 'Some previously cached source';
        const options = 'Some previously cached options';
        ceMock.expects('cacheGet').withArgs(match({source, options})).resolves({code: 123});
        const cachedResult = await compiler.compile(source, options, {}, {}, false, [], {}, [], undefined);
        cachedResult.code.should.equal(123);
        ceMock.verify();
    });

    it('should note read from the cache (when bypassed)', async () => {
        const ceMock = mock(ce);
        const fakeExecResults = {
            code: 0,
            okToCache: true,
            stdout: 'stdout',
            stderr: 'stderr',
        };
        const source = 'Some previously cached source';
        const options = 'Some previously cached options';
        ceMock.expects('cacheGet').never();
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(execStub, compiler, 'This is the output file', fakeExecResults, undefined);
        const uncachedResult = await compiler.compile(source, options, {}, {}, true, [], {}, [], undefined);
        uncachedResult.code.should.equal(0);
        ceMock.verify();
    });

    it('should execute', async () => {
        const execMock = mock(exec);
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(
            execStub,
            compiler,
            'This is the output asm file',
            {
                code: 0,
                okToCache: true,
                stdout: 'asm stdout',
                stderr: 'asm stderr',
            },
            0,
        );
        stubOutCallToExec(
            execStub,
            compiler,
            'This is the output binary file',
            {
                code: 0,
                okToCache: true,
                stdout: 'binary stdout',
                stderr: 'binary stderr',
            },
            1,
        );
        execMock.expects('sandbox').withArgs(match.string, match.array, match.object).resolves({
            code: 0,
            stdout: 'exec stdout',
            stderr: 'exec stderr',
        });
        const result = await compiler.compile('source', 'options', {}, {execute: true}, false, [], {}, [], undefined);
        result.code.should.equal(0);
        result.execResult.didExecute.should.be.true;
        result.stdout.should.deep.equal([{text: 'asm stdout'}]);
        result.execResult.stdout.should.deep.equal([{text: 'exec stdout'}]);
        result.execResult.buildResult.stdout.should.deep.equal([{text: 'binary stdout'}]);
        result.stderr.should.deep.equal([{text: 'asm stderr'}]);
        result.execResult.stderr.should.deep.equal([{text: 'exec stderr'}]);
        result.execResult.buildResult.stderr.should.deep.equal([{text: 'binary stderr'}]);
        execMock.verify();
    });

    it('should execute with an execution wrapper', async () => {
        const executionWrapper = '/some/wrapper/script.sh';
        (compiler as any).compiler.executionWrapper = executionWrapper;
        const execMock = mock(exec);
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(
            execStub,
            compiler,
            'This is the output asm file',
            {
                code: 0,
                okToCache: true,
                stdout: 'asm stdout',
                stderr: 'asm stderr',
            },
            0,
        );
        stubOutCallToExec(
            execStub,
            compiler,
            'This is the output binary file',
            {
                code: 0,
                okToCache: true,
                stdout: 'binary stdout',
                stderr: 'binary stderr',
            },
            1,
        );
        execMock.expects('sandbox').withArgs(executionWrapper, match.array, match.object).resolves({
            code: 0,
            stdout: 'exec stdout',
            stderr: 'exec stderr',
        });
        await compiler.compile('source', 'options', {}, {execute: true}, false, [], {}, [], undefined);
        execMock.verify();
    });

    it('should not execute where not supported', async () => {
        const execMock = mock(exec);
        const execStub = stub(compilerNoExec, 'exec');
        stubOutCallToExec(
            execStub,
            compilerNoExec,
            'This is the output asm file',
            {
                code: 0,
                okToCache: true,
                stdout: 'asm stdout',
                stderr: 'asm stderr',
            },
            0,
        );
        stubOutCallToExec(
            execStub,
            compilerNoExec,
            'This is the output binary file',
            {
                code: 0,
                okToCache: true,
                stdout: 'binary stdout',
                stderr: 'binary stderr',
            },
            1,
        );
        const result = await compilerNoExec.compile(
            'source',
            'options',
            {},
            {execute: true},
            false,
            [],
            {},
            [],
            undefined,
        );
        result.code.should.equal(0);
        result.execResult.didExecute.should.be.false;
        result.stdout.should.deep.equal([{text: 'asm stdout'}]);
        result.execResult.stdout.should.deep.equal([]);
        result.execResult.buildResult.stdout.should.deep.equal([{text: 'binary stdout'}]);
        result.stderr.should.deep.equal([{text: 'asm stderr'}]);
        result.execResult.stderr.should.deep.equal([{text: 'Compiler does not support execution'}]);
        result.execResult.buildResult.stderr.should.deep.equal([{text: 'binary stderr'}]);
        execMock.verify();
    });

    it('should demangle', async () => {
        const withDemangler = {...noExecuteSupportCompilerInfo, demangler: 'demangler-exe', demanglerType: 'cpp'};
        const compiler = new BaseCompiler(withDemangler, ce);
        const execStub = stub(compiler, 'exec');
        stubOutCallToExec(
            execStub,
            compiler,
            'someMangledSymbol:\n',
            {
                code: 0,
                okToCache: true,
                stdout: 'stdout',
                stderr: 'stderr',
            },
            undefined,
        );
        execStub.onCall(1).callsFake((demangler, args, options) => {
            demangler.should.equal('demangler-exe');
            options.input.should.equal('someMangledSymbol');
            return Promise.resolve({
                code: 0,
                filenameTransform: (x: any) => x,
                stdout: 'someDemangledSymbol\n',
                stderr: '',
            });
        });

        const result = await compiler.compile('source', 'options', {}, {demangle: true}, false, [], {}, [], undefined);
        result.code.should.equal(0);
        result.asm.should.deep.equal([{source: null, labels: [], text: 'someDemangledSymbol:'}]);
        // TODO all with demangle: false
    });

    async function objdumpTest(type, expectedArgs) {
        const withObjdumper = {
            ...noExecuteSupportCompilerInfo,
            objdumper: 'objdump-exe',
            objdumperType: type,
        };
        const compiler = new BaseCompiler(withObjdumper, ce);
        const execStub = stub(compiler, 'exec');
        execStub.onCall(0).callsFake((objdumper, args, options) => {
            objdumper.should.equal('objdump-exe');
            args.should.deep.equal(expectedArgs);
            options.maxOutput.should.equal(123456);
            return Promise.resolve({
                code: 0,
                filenameTransform: x => x,
                stdout: '<No output file output>',
                stderr: '',
            });
        });
        compiler.supportsObjdump().should.be.true;
        const result = await compiler.objdump(
            'output',
            {},
            123456,
            true,
            true,
            false,
            false,
            makeFakeParseFiltersAndOutputOptions({}),
        );
        result.asm.should.deep.equal('<No output file output>');
    }

    it('should run default objdump properly', async () => {
        return objdumpTest('default', ['-d', 'output', '-l', '--insn-width=16', '-C', '-M', 'intel']);
    });

    it('should run binutils objdump properly', async () => {
        return objdumpTest('binutils', ['-d', 'output', '-l', '--insn-width=16', '-C', '-M', 'intel']);
    });

    it('should run ELF Tool Chain objdump properly', async () => {
        return objdumpTest('elftoolchain', ['-d', 'output', '-l', '-C', '-M', 'intel']);
    });

    it('should run LLVM objdump properly', async () => {
        return objdumpTest('llvm', ['-d', 'output', '-l', '-C', '--x86-asm-syntax=intel']);
    });

    it('should run process opt output', async () => {
        const test = `--- !Missed
Pass: inline
Name: NeverInline
DebugLoc: { File: example.cpp, Line: 4, Column: 21 }
Function: main
Args: []
...
`;
        const dirPath = await compiler.newTempDir();
        const optPath = path.join(dirPath, 'temp.out');
        await fs.writeFile(optPath, test);
        const a = await compiler.processOptOutput(optPath);
        a.should.deep.equal([
            {
                Args: [],
                DebugLoc: {Column: 21, File: 'example.cpp', Line: 4},
                Function: 'main',
                Name: 'NeverInline',
                Pass: 'inline',
                displayString: '',
                optType: 'Missed',
            },
        ]);
    });

    it('should normalize extra file path', () => {
        const withDemangler = {...noExecuteSupportCompilerInfo, demangler: 'demangler-exe', demanglerType: 'cpp'};
        const compiler = new BaseCompiler(withDemangler, ce);
        if (process.platform === 'win32') {
            (compiler as any)
                .getExtraFilepath('c:/tmp/somefolder', 'test.h')
                .should.equal('c:\\tmp\\somefolder\\test.h');
        } else {
            (compiler as any).getExtraFilepath('/tmp/somefolder', 'test.h').should.equal('/tmp/somefolder/test.h');
        }

        try {
            (compiler as any).getExtraFilepath('/tmp/somefolder', '../test.h');
            throw 'Should throw exception 1';
        } catch (error) {
            if (!(error instanceof Error)) {
                throw error;
            }
        }

        try {
            (compiler as any).getExtraFilepath('/tmp/somefolder', './../test.h');
            throw 'Should throw exception 2';
        } catch (error) {
            if (!(error instanceof Error)) {
                throw error;
            }
        }

        try {
            (compiler as any)
                .getExtraFilepath('/tmp/somefolder', '/tmp/someotherfolder/test.h')
                .should.equal('/tmp/somefolder/tmp/someotherfolder/test.h');
        } catch (error) {
            if (!(error instanceof Error)) {
                throw error;
            }
        }

        try {
            (compiler as any).getExtraFilepath('/tmp/somefolder', '\\test.h').should.equal('/tmp/somefolder/test.h');
        } catch (error) {
            if (!(error instanceof Error)) {
                throw error;
            }
        }

        try {
            (compiler as any).getExtraFilepath('/tmp/somefolder', 'test_hello/../../etc/passwd');
            throw 'Should throw exception 5';
        } catch (error) {
            if (!(error instanceof Error)) {
                throw error;
            }
        }

        if (process.platform === 'win32') {
            (compiler as any)
                .getExtraFilepath('c:/tmp/somefolder', 'test.txt')
                .should.equal('c:\\tmp\\somefolder\\test.txt');
        } else {
            (compiler as any).getExtraFilepath('/tmp/somefolder', 'test.txt').should.equal('/tmp/somefolder/test.txt');
        }

        try {
            (compiler as any)
                .getExtraFilepath('/tmp/somefolder', 'subfolder/hello.h')
                .should.equal('/tmp/somefolder/subfolder/hello.h');
        } catch (error) {
            if (!(error instanceof Error)) {
                throw error;
            }
        }
    });
});