Compose appended request messages

internal/llm/openai_compatible_client_test.go

@@ -363,6 +363,7 @@ func TestOpenAICompatibleClientRequestMapping(t *testing.T) {
 		run  func(*testing.T)
 	}{
 		{name: "complete request and response mapping", run: checkCompleteRequestAndResponseMapping},
+		{name: "canonical role and exact content", run: checkCanonicalRoleAndExactContentMapping},
 		{name: "cache-controlled message", run: checkCacheControlledMessageMapping},
 		{name: "empty cache-control TTL", run: checkEmptyCacheControlTTLOmission},
 		{name: "session ID", run: checkSessionIDMapping},
@@ -377,6 +378,34 @@ func TestOpenAICompatibleClientRequestMapping(t *testing.T) {
 	}
 }
 
+func checkCanonicalRoleAndExactContentMapping(t *testing.T) {
+	provider := newRecordingProvider(t)
+	client := newProviderClient(t, provider, OpenAICompatibleConfig{})
+	const content = "  exact content\nwith whitespace  "
+	_, err := client.Generate(context.Background(), domain.GenerateRequest{
+		Prompt: domain.RenderedPrompt{Messages: []domain.RenderedMessage{{
+			Role:    domain.RoleDeveloper,
+			Content: content,
+		}}},
+		Target: domain.ExecutionTarget{Model: "model"},
+	})
+	if err != nil {
+		t.Fatalf("Generate() error = %v", err)
+	}
+
+	var messages []struct {
+		Role    string `json:"role"`
+		Content string `json:"content"`
+	}
+	request := provider.lastRequest(t)
+	if !request.decodeField(t, "messages", &messages) || len(messages) != 1 {
+		t.Fatalf("messages = %#v, want one message", messages)
+	}
+	if messages[0].Role != domain.RoleDeveloper || messages[0].Content != content {
+		t.Fatalf("message = %#v, want role %q and exact content %q", messages[0], domain.RoleDeveloper, content)
+	}
+}
+
 func checkCompleteRequestAndResponseMapping(t *testing.T) {
 	provider := newRecordingProvider(t)
 	provider.respond(http.StatusOK, `{