test: add integration tests for improved git error messages

Co-authored-by: alirezanet <7004080+alirezanet@users.noreply.github.com>

tests/HuskyIntegrationTests/GitErrorMessageTests.cs

@@ -0,0 +1,46 @@
+using FluentAssertions;
+
+namespace HuskyIntegrationTests;
+
+/// <summary>
+/// Integration tests that verify the error messages shown when git is unavailable
+/// or when Husky has not been installed (dotnet husky install was not run).
+/// </summary>
+public class GitErrorMessageTests(ITestOutputHelper output)
+{
+   [Fact]
+   public async Task HuskyRun_WhenHuskyIsNotInstalled_ShouldShowInstallHintInErrorMessage()
+   {
+      // arrange: set up git and husky tool WITHOUT running dotnet husky install
+      await using var c = await DockerHelper.StartContainerAsync();
+      await c.BashAsync("dotnet new tool-manifest");
+      await c.BashAsync("dotnet tool install --no-cache --add-source /app/nupkg/ husky --version 99.1.1-test");
+      await c.BashAsync("dotnet tool restore");
+      await c.BashAsync("git init");
+      // Intentionally NOT running: dotnet husky install
+
+      // act
+      var result = await c.BashAsync(output, "dotnet husky run");
+
+      // assert
+      result.ExitCode.Should().NotBe(0);
+      result.Stderr.Should().Contain("dotnet husky install");
+   }
+
+   [Fact]
+   public async Task HuskyRun_WhenGitIsNotAvailable_ShouldShowHelpfulErrorMessage()
+   {
+      // arrange: fully install husky, then remove the git binary from PATH to simulate it being missing
+      await using var c = await DockerHelper.StartWithInstalledHusky();
+      await c.BashAsync("mv $(which git) /tmp/git_backup");
+
+      // act
+      var result = await c.BashAsync(output, "dotnet husky run");
+
+      // assert
+      result.ExitCode.Should().NotBe(0);
+      var allOutput = result.Stdout + result.Stderr;
+      allOutput.Should().Contain("not found");
+      allOutput.Should().Contain("PATH");
+   }
+}