test(gallery): extend importer specs to cover buun-llama-cpp

Two additions that pair with the new backend:
- An Import()-side case that asserts preference buun-llama-cpp produces
  backend: buun-llama-cpp in the emitted YAML (mirrors the existing
  ik-llama-cpp and turboquant cases).
- AdditionalBackends() spec now asserts all three drop-in replacements
  are advertised, and verifies buun-llama-cpp's Modality/Description
  alongside the other two.

Assisted-by: Claude:Opus-4.7 [Read] [Edit] [Bash]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

core/gallery/importers/llama-cpp_test.go

@@ -203,6 +203,23 @@ var _ = Describe("LlamaCPPImporter", func() {
 			Expect(modelConfig.Files[0].Filename).To(Equal("my-model.gguf"))
 		})
 
+		It("swaps the emitted backend to buun-llama-cpp when preferred", func() {
+			preferences := json.RawMessage(`{"backend": "buun-llama-cpp"}`)
+			details := Details{
+				URI:         "https://example.com/my-model.gguf",
+				Preferences: preferences,
+			}
+
+			modelConfig, err := importer.Import(details)
+
+			Expect(err).ToNot(HaveOccurred())
+			Expect(modelConfig.ConfigFile).To(ContainSubstring("backend: buun-llama-cpp"), fmt.Sprintf("Model config: %+v", modelConfig))
+			Expect(modelConfig.ConfigFile).NotTo(ContainSubstring("backend: llama-cpp\n"), fmt.Sprintf("Model config: %+v", modelConfig))
+			Expect(modelConfig.ConfigFile).To(ContainSubstring("model: my-model.gguf"), fmt.Sprintf("Model config: %+v", modelConfig))
+			Expect(len(modelConfig.Files)).To(Equal(1))
+			Expect(modelConfig.Files[0].Filename).To(Equal("my-model.gguf"))
+		})
+
 		It("keeps backend: llama-cpp for unknown backend preferences", func() {
 			// Unknown backend values must not leak into the emitted YAML —
 			// we only honour the curated drop-in replacements.
@@ -551,7 +568,7 @@ var _ = Describe("LlamaCPPImporter", func() {
 	})
 
 	Context("AdditionalBackends", func() {
-		It("advertises ik-llama-cpp, turboquant and vllm-cpp as drop-in replacements", func() {
+		It("advertises all llama-cpp drop-in replacements", func() {
 			entries := importer.AdditionalBackends()
 
 			names := make([]string, 0, len(entries))
@@ -560,7 +577,7 @@ var _ = Describe("LlamaCPPImporter", func() {
 				names = append(names, e.Name)
 				byName[e.Name] = e
 			}
-			Expect(names).To(ConsistOf("ik-llama-cpp", "turboquant", "vllm-cpp"))
+			Expect(names).To(ConsistOf("ik-llama-cpp", "turboquant", "vllm-cpp", "buun-llama-cpp"))
 
 			for _, name := range names {
 				e := byName[name]