test(server): add test showing incorrect behavior for failed binding generation (#1930)

To be able to test the fix in
#1924.

Author: krzema12

jit-binding-server/build.gradle.kts

@@ -26,6 +26,8 @@ dependencies {
 
     implementation(projects.mavenBindingBuilder)
     implementation(projects.sharedInternal)
+
+    testImplementation("io.ktor:ktor-server-test-host")
 }
 
 application {

jit-binding-server/src/test/kotlin/io/github/typesafegithub/workflows/jitbindingserver/ArtifactRoutesTest.kt

@@ -0,0 +1,36 @@
+package io.github.typesafegithub.workflows.jitbindingserver
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.ktor.client.request.get
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.routing.routing
+import io.ktor.server.testing.testApplication
+
+class ArtifactRoutesTest :
+    FunSpec({
+        context("artifacts for a given version") {
+            test("when binding generation fails") {
+                testApplication {
+                    // Given
+                    application {
+                        routing {
+                            artifactRoutes(
+                                buildBindingsCache(
+                                    buildVersionArtifacts = { error("An internal error occurred!") },
+                                ),
+                            )
+                        }
+                    }
+
+                    // When
+                    val response = client.get("some-owner/some-action/v4/some-action-v4.pom")
+
+                    // Then
+                    // This is incorrect, and will be fixed in
+                    //  https://github.com/typesafegithub/github-workflows-kt/pull/1924/
+                    response.status shouldBe HttpStatusCode.NotFound
+                }
+            }
+        }
+    })