LPRun 7.5.10

LINQPad Driver LPRun Unit/Integration Tests Runner

Table of Contents

• Description
• Website
• Download
• Usage
  • Setup
  • LINQPad Test Script Example
  • NUnit Test Example
• Known Issues
• Authors
• Credits
  • Tools
  • NuGet
• License

Description

LINQPad driver LPRun unit/integration tests runner. Can be used for testing LINQPad 7/LINQPad 6 drivers using LPRun or for running LINQPad scripts.

Website

LPRun is a part of CsvLINQPadDriver for LINQPad 7/6/5. LPRun source code can be found here.

Download

Usage

Tested driver MUST NOT be installed via NuGet into LINQPad. In this case LPRun will use it instead of local one.

Setup

1. Create test project.
2. Add LPRun
3. Create the following folder structure in test project:

LPRun # Created by LPRun NuGet.
    Templates # LINQPad script templates.
    Data      # Optional: Driver data files.

LINQPad Test Script Example

LPRun executes LINQPad test script. Test script uses Fluent Assertions for assertion checks.

StringComparison.linq LINQPad test script example:

var original = Books.First();
var copy = original with { Title = original.Title.ToUpper() };

var expectedEquality = original.Title.Equals(copy.Title, context.StringComparison);

original.Equals(copy).Should().Be(expectedEquality, Reason());

original.GetHashCode()
    .Equals(copy.GetHashCode())
    .Should()
    .Be(expectedEquality, Reason());

Reason() method (prints exact line number if assertion fails) and context variable are injected by test below.

NUnit Test Example

Full NUnit test code can be found here.

[TestFixture]
public class LPRunTests
{
    [OneTimeSetUp]
    public void Init() =>
        // Copy driver to LPRun drivers folder.
        Driver.InstallWithDepsJson(
            // The directory to copy driver files to.
            "CsvLINQPadDriver",
            // The LINQPad driver files.
            "CsvLINQPadDriver.dll",
            // The test folder path.
            "Tests");

    [Test]
    [TestCaseSource(nameof(TestsData))]
    public void Execute_ScriptWithDriverProperties_Success(
        (string linqScriptName,
         string? context,
         ICsvDataContextDriverProperties driverProperties) testData)
    {
        var (linqScriptName, context, driverProperties) = testData;

        // Arrange: Create query connection header. Custom code can be added here.
        var queryConfig = GetQueryHeaders().Aggregate(
            new StringBuilder(),
            (stringBuilder, h) =>
        {
            stringBuilder.AppendLine(h);
            stringBuilder.AppendLine();
            return stringBuilder;
        }).ToString();

        // Arrange: Create test LNQPad script.
        var linqScript = LinqScript.Create(
            $"{linqScriptName}.linq",
            queryConfig);

        // Act: Execute test LNQPad script.
        var (output, error, exitCode) =
            Runner.Execute(linqScript);

        // Assert.
        error.Should().BeNullOrWhiteSpace();
        exitCode.Should().Be(0);

        // Helpers.
        IEnumerable<string> GetQueryHeaders()
        {
            // Connection header.
            yield return ConnectionHeader.Get(
                "CsvLINQPadDriver",
                "CsvLINQPadDriver.CsvDataContextDriver",
                driverProperties,
                "System.Runtime.CompilerServices");

            // FluentAssertions helper.
            yield return
                @"string Reason([CallerLineNumber] int sourceLineNumber = 0) =>" +
                @" $""something went wrong at line #{sourceLineNumber}"";";

            // Test context.
            if (!string.IsNullOrWhiteSpace(context))
            {
                yield return $"var context = {context};";
            }
        }
    }

    private static IEnumerable<
        (string linqScriptName,
         string? context,
         ICsvDataContextDriverProperties driverProperties)> TestsData()
    {
        // Omitted for brevity.
    }
}

Tests can also be run in parallel:

[TestFixture]
public class LPRunTests
{
    [Test]
    [Parallelizable(ParallelScope.Children)]
    [TestCaseSource(nameof(ParallelizableTestsData))]
    public void Execute_ScriptWithDriverProperties_Success(
        (string linqScriptName,
         string? context,
         ICsvDataContextDriverProperties driverProperties,
         int index) testData)
    {
        // ...

        // Arrange: Create test LNQPad script.
        var linqScript = LinqScript.Create(
            $"{linqScriptName}.linq",
            queryConfig,
            $"{linqScriptName}_{testData.index}");

        // ...
    }

    private static IEnumerable<
        (string linqScriptName,
         string? context,
         ICsvDataContextDriverProperties driverProperties,
         int index)> TestsData()
    {
        // Omitted for brevity.
    }

    // Parallelized tests data.
    private static IEnumerable<
        (string linqScriptName,
         string? context,
         ICsvDataContextDriverProperties driverProperties,
         int index)> ParallelizableTestsData() =>
        TestsData().AugmentWithFileIndex(
            static testData => testData.linqScriptName,
            static (testData, index) => { testData.index = index; return testData; });
}

Known Issues

• Tested with NUnit. Other test frameworks should work as well.

Authors

• Ivan Ivon (ivan.ivon@gmail.com)

Credits

Tools

• LINQPad 7/LINQPad 6
• LINQPad Command-Line and Scripting

NuGet

• Fluent Assertions
• NUnit

License

MIT, see LICENSE file for details.