Add test to try emitting error

Author: andrewheard

FirebaseAI/Tests/TestApp/Tests/Integration/GenerateContentIntegrationTests.swift

@@ -47,6 +47,19 @@ struct GenerateContentIntegrationTests {
     storage = Storage.storage()
   }
 
+  @Test(arguments: InstanceConfig.allConfigs)
+  func foo(_ config: InstanceConfig) async throws {
+    throw GenerateContentError
+      .internalError(
+        underlying: BackendError(
+          httpResponseCode: 503,
+          message: "Backend Overloaded",
+          status: .unavailable,
+          details: []
+        )
+      )
+  }
+
   @Test(arguments: InstanceConfig.allConfigs)
   func generateContent(_ config: InstanceConfig) async throws {
     let model = FirebaseAI.componentInstance(config).generativeModel(

FirebaseAI/Tests/TestApp/Tests/Utilities/IgnoreBackendOverloadedTrait.swift

@@ -30,6 +30,12 @@ struct IgnoreBackendOverloadedTrait: TestTrait, SuiteTrait, TestScoping {
     } matching: { issue in
       if case let .internalError(error as BackendError) = issue.error as? GenerateContentError,
          error.isServiceUnavailable {
+        if let sourceLocation = issue.sourceLocation {
+          print("""
+          ::error file={\(sourceLocation.fileName)},line={\(sourceLocation.line)},\
+          title={Ignored Backend Overloaded Error}::{\(issue.description)}
+          """)
+        }
         return true
       } else if let error = issue.error as? BackendError, error.isServiceUnavailable {
         return true