Centralize execution setting and session validation

engine_test.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"strconv"
 	"strings"
 	"testing"
 	"testing/fstest"
@@ -1792,6 +1793,35 @@ func TestWithProfilesRejectsDuplicateIDs(t *testing.T) {
 	}
 }
 
+func TestWithProfilesRejectsInvalidExecutionSettings(t *testing.T) {
+	type testCase struct {
+		name    string
+		profile promptkit.Profile
+	}
+	tests := []testCase{
+		{name: "non-finite temperature", profile: promptkit.Profile{Temperature: math.NaN()}},
+		{name: "non-finite top p", profile: promptkit.Profile{TopP: math.Inf(-1)}},
+	}
+	if strconv.IntSize == 64 {
+		durationLimit := int64(math.MaxInt64 / int64(time.Second))
+		tests = append(tests, testCase{name: "unrepresentable timeout", profile: promptkit.Profile{TimeoutSeconds: int(durationLimit) + 1}})
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tt.profile.ID = "invalid-settings"
+			tt.profile.Endpoint = "http://example.test/v1"
+			tt.profile.Model = "model"
+			_, err := promptkit.NewEngine(promptkit.Config{PromptDir: frameworkPromptDir},
+				promptkit.WithProfiles(tt.profile),
+			)
+			if !errors.Is(err, promptkit.ErrInvalidConfig) {
+				t.Fatalf("expected ErrInvalidConfig, got %v", err)
+			}
+		})
+	}
+}
+
 func TestOpenAICompatibleProfileRunsThroughNormalProfilePath(t *testing.T) {
 	fake := &fakeLLMClient{response: &promptkit.GenerateResponse{Content: "ok"}}
 	prof := promptkit.OpenAICompatibleProfile(promptkit.OpenAICompatibleProfileConfig{