Add InstallScriptBuilder + GET /install.sh + GET /client.tar.gz

backend.tests/InstallEndpointsTests.cs

@@ -0,0 +1,55 @@
+using System.Net;
+using FluentAssertions;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Xunit;
+
+namespace backend.tests;
+
+public class InstallEndpointsTests
+{
+    [Fact]
+    public async Task Install_sh_returns_shell_script_with_request_host()
+    {
+        using var factory = new ApiFactory();
+        var client = factory.CreateClient();
+        var res = await client.GetAsync("/install.sh");
+        res.StatusCode.Should().Be(HttpStatusCode.OK);
+        res.Content.Headers.ContentType!.MediaType.Should().Be("text/x-shellscript");
+
+        var body = await res.Content.ReadAsStringAsync();
+        body.Should().StartWith("#!/usr/bin/env bash");
+        body.Should().Contain("BACKEND_URL=\"http://localhost\"");
+    }
+
+    [Fact]
+    public async Task Client_tarball_returns_octet_stream()
+    {
+        var tmp = Path.Combine(Path.GetTempPath(), $"client-test-{Guid.NewGuid():N}.tar.gz");
+        File.WriteAllBytes(tmp, new byte[] { 0x1f, 0x8b }); // tiny gzip-ish marker
+
+        try
+        {
+            using var factory = new ApiFactory();
+            var client = factory.WithWebHostBuilder(b =>
+            {
+                b.ConfigureAppConfiguration((_, cfg) =>
+                {
+                    cfg.AddInMemoryCollection(new Dictionary<string, string?>
+                    {
+                        ["Install:ClientTarballPath"] = tmp,
+                    });
+                });
+            }).CreateClient();
+
+            var res = await client.GetAsync("/client.tar.gz");
+            res.StatusCode.Should().Be(HttpStatusCode.OK);
+            res.Content.Headers.ContentType!.MediaType.Should().Be("application/gzip");
+            (await res.Content.ReadAsByteArrayAsync()).Length.Should().Be(2);
+        }
+        finally
+        {
+            if (File.Exists(tmp)) File.Delete(tmp);
+        }
+    }
+}

backend.tests/InstallScriptBuilderTests.cs

@@ -0,0 +1,18 @@
+using backend.Install;
+using FluentAssertions;
+using Xunit;
+
+namespace backend.tests;
+
+public class InstallScriptBuilderTests
+{
+    [Fact]
+    public void Build_inlines_the_backend_url_into_the_script()
+    {
+        var script = new InstallScriptBuilder().Build("https://example.test");
+        script.Should().Contain("BACKEND_URL=\"https://example.test\"");
+        script.Should().Contain("#!/usr/bin/env bash");
+        script.Should().Contain("$BACKEND_URL/client.tar.gz");
+        script.Should().Contain("client.pair");
+    }
+}