diff --git a/builder.go b/builder.go
index f0c2406..e4aebc7 100644
--- a/builder.go
+++ b/builder.go
@@ -198,6 +198,20 @@ func AddSingleton[T any](cb ContainerBuilder, ctor any, implementedInterfaceType
 	cb.Add(Singleton[T](ctor, implementedInterfaceTypes...))
 }
 
+// AddFunc is a convenience method to add a singleton service descriptor to the ContainerBuilder.
+func AddFunc[T any](cb ContainerBuilder, ctor any) {
+	AddSingleton[T](cb, ctor)
+}
+
+// AddFuncByLookupKey is a convenience method to add a singleton service descriptor to the ContainerBuilder.
+func AddFuncWithLookupKeys[T any](cb ContainerBuilder,
+	ctor any,
+	lookupKeys []string,
+	metadata map[string]interface{},
+) {
+	AddSingletonWithLookupKeys[T](cb, ctor, lookupKeys, metadata)
+}
+
 // Add a singleton service descriptor to the ContainerBuilder.
 // T is the service type,
 // cb is the ContainerBuilder,
diff --git a/funcs_test.go b/funcs_test.go
new file mode 100644
index 0000000..0ca77e3
--- /dev/null
+++ b/funcs_test.go
@@ -0,0 +1,47 @@
+package di
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type (
+	MyFunc func() string
+)
+
+func AddMyFunc(b ContainerBuilder) {
+	AddFunc[MyFunc](b, func() MyFunc {
+		return func() string {
+			return "Hello"
+		}
+	})
+}
+func AddMyFuncByName(b ContainerBuilder, name string) {
+	AddFuncWithLookupKeys[MyFunc](b,
+		func() MyFunc {
+			return func() string {
+				return "Hello: " + name
+			}
+		}, []string{name}, map[string]interface{}{})
+}
+func TestAddMyFunc(t *testing.T) {
+	b := Builder()
+	// Build the container
+	AddMyFunc(b)
+	c := b.Build()
+
+	myFunc := Get[MyFunc](c)
+	require.NotNil(t, myFunc)
+	require.Equal(t, "Hello", myFunc())
+}
+func TestAddMyFuncByName(t *testing.T) {
+	b := Builder()
+	// Build the container
+	AddMyFuncByName(b, "test")
+	c := b.Build()
+
+	myFunc := GetByLookupKey[MyFunc](c, "test")
+	require.NotNil(t, myFunc)
+	require.Equal(t, "Hello: test", myFunc())
+}
diff --git a/lookup_keys_test.go b/lookup_keys_test.go
new file mode 100644
index 0000000..2fe1263
--- /dev/null
+++ b/lookup_keys_test.go
@@ -0,0 +1,148 @@
+package di
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func AddSingletonEmployeesWithLookupKeys(b ContainerBuilder) {
+	AddSingletonWithLookupKeys[*employee](b,
+		func() *employee {
+			return &employee{Name: "1"}
+		}, []string{"1"}, map[string]interface{}{"name": "1"},
+		reflect.TypeOf((*IEmployee)(nil)))
+	AddSingletonWithLookupKeys[*employee](b,
+		func() *employee {
+			return &employee{Name: "2a"}
+		}, []string{"2"}, map[string]interface{}{"name": "2a"},
+		reflect.TypeOf((*IEmployee)(nil)))
+	AddSingletonWithLookupKeys[*employee](b,
+		func() *employee {
+			return &employee{Name: "2"}
+		}, []string{"2"}, map[string]interface{}{"name": "2"},
+		reflect.TypeOf((*IEmployee)(nil)))
+}
+func AddTransientEmployeesWithLookupKeys(b ContainerBuilder) {
+	AddTransientWithLookupKeys[*employee](b,
+		func() *employee {
+			return &employee{Name: "1"}
+		}, []string{"1"},
+		map[string]interface{}{"name": "1"},
+		reflect.TypeOf((*IEmployee)(nil)))
+	AddTransientWithLookupKeys[*employee](b,
+		func() *employee {
+			return &employee{Name: "2"}
+		}, []string{"2"},
+		map[string]interface{}{"name": "2"},
+		reflect.TypeOf((*IEmployee)(nil)))
+}
+func AddInstanceEmployeesWithLookupKeys(b ContainerBuilder) {
+	AddInstanceWithLookupKeys[*employee](b,
+		&employee{Name: "1"}, []string{"1"},
+		map[string]interface{}{"name": "1"},
+		reflect.TypeOf((*IEmployee)(nil)))
+	AddInstanceWithLookupKeys[*employee](b,
+		&employee{Name: "2"}, []string{"2"},
+		map[string]interface{}{"name": "2"},
+		reflect.TypeOf((*IEmployee)(nil)))
+}
+func AddScopedHandlersWithLookupKeys(b ContainerBuilder) {
+	AddScopedWithLookupKeys[*handler](b,
+		func() *handler {
+			return &handler{path: "1"}
+		}, []string{"1"}, map[string]interface{}{"name": "1"},
+		reflect.TypeOf((*IHandler)(nil)))
+	AddScopedWithLookupKeys[*handler](b,
+		func() *handler {
+			return &handler{path: "2"}
+		}, []string{"2"}, map[string]interface{}{"name": "2"},
+		reflect.TypeOf((*IHandler)(nil)))
+}
+
+func TestManyWithScopeWithLookupKeys(t *testing.T) {
+	b := Builder()
+	// Build the container
+	AddScopedHandlersWithLookupKeys(b)
+	c := b.Build()
+	scopeFactory := Get[ScopeFactory](c)
+	scope1 := scopeFactory.CreateScope()
+	ctn := scope1.Container()
+	descriptors := ctn.GetDescriptors()
+	require.Equal(t, 2, len(descriptors))
+	for _, d := range descriptors {
+		require.NotEmpty(t, d.Metadata)
+		_, ok := d.Metadata["name"]
+		require.True(t, ok)
+		_, ok = d.Metadata["name"].(string)
+		require.True(t, ok)
+
+		fmt.Println(d)
+	}
+	handlers := Get[[]IHandler](ctn)
+	require.Equal(t, 2, len(handlers))
+	require.NotPanics(t, func() {
+		h := GetByLookupKey[IHandler](c, "1")
+		require.NotNil(t, h)
+		require.Equal(t, "1", h.GetPath())
+	})
+}
+func TestManyWithSingletonWithLookupKeys(t *testing.T) {
+	b := Builder()
+	// Build the container
+	AddSingletonEmployeesWithLookupKeys(b)
+	c := b.Build()
+	scopeFactory := Get[ScopeFactory](c)
+	scope1 := scopeFactory.CreateScope()
+	employees := Get[[]IEmployee](scope1.Container())
+	require.Equal(t, 3, len(employees))
+	require.NotPanics(t, func() {
+		h := GetByLookupKey[IEmployee](c, "1")
+		require.NotNil(t, h)
+		require.Equal(t, "1", h.GetName())
+	})
+	require.NotPanics(t, func() {
+		h := GetByLookupKey[IEmployee](c, "2")
+		require.NotNil(t, h)
+		require.Equal(t, "2", h.GetName())
+	})
+}
+func TestManyWithTransientWithLookupKeys(t *testing.T) {
+	b := Builder()
+	// Build the container
+	AddTransientEmployeesWithLookupKeys(b)
+	c := b.Build()
+	scopeFactory := Get[ScopeFactory](c)
+	scope1 := scopeFactory.CreateScope()
+	employees := Get[[]IEmployee](scope1.Container())
+	require.Equal(t, 2, len(employees))
+	require.NotPanics(t, func() {
+		h := GetByLookupKey[IEmployee](c, "1")
+		require.NotNil(t, h)
+		require.Equal(t, "1", h.GetName())
+	})
+}
+func TestManyWithInstanceWithLookupKeys(t *testing.T) {
+	b := Builder()
+	// Build the container
+	AddInstanceEmployeesWithLookupKeys(b)
+	c := b.Build()
+	scopeFactory := Get[ScopeFactory](c)
+	scope1 := scopeFactory.CreateScope()
+	employees := Get[[]IEmployee](scope1.Container())
+	require.Equal(t, 2, len(employees))
+	require.NotPanics(t, func() {
+		h := GetByLookupKey[IEmployee](c, "1")
+		require.NotNil(t, h)
+		require.Equal(t, "1", h.GetName())
+	})
+	employeePtrs := Get[[]*employee](scope1.Container())
+	require.Equal(t, 2, len(employeePtrs))
+	require.NotPanics(t, func() {
+		h := GetByLookupKey[*employee](c, "1")
+		require.NotNil(t, h)
+		require.Equal(t, "1", h.GetName())
+	})
+}
diff --git a/many_interfaces_test.go b/many_interfaces_test.go
index 3d006d9..65a48b4 100644
--- a/many_interfaces_test.go
+++ b/many_interfaces_test.go
@@ -80,59 +80,6 @@ func AddSingletonTime(b ContainerBuilder) {
 		return &myTime{}
 	})
 }
-func AddSingletonEmployeesWithLookupKeys(b ContainerBuilder) {
-	AddSingletonWithLookupKeys[*employee](b,
-		func() *employee {
-			return &employee{Name: "1"}
-		}, []string{"1"}, map[string]interface{}{"name": "1"},
-		reflect.TypeOf((*IEmployee)(nil)))
-	AddSingletonWithLookupKeys[*employee](b,
-		func() *employee {
-			return &employee{Name: "2a"}
-		}, []string{"2"}, map[string]interface{}{"name": "2a"},
-		reflect.TypeOf((*IEmployee)(nil)))
-	AddSingletonWithLookupKeys[*employee](b,
-		func() *employee {
-			return &employee{Name: "2"}
-		}, []string{"2"}, map[string]interface{}{"name": "2"},
-		reflect.TypeOf((*IEmployee)(nil)))
-}
-func AddTransientEmployeesWithLookupKeys(b ContainerBuilder) {
-	AddTransientWithLookupKeys[*employee](b,
-		func() *employee {
-			return &employee{Name: "1"}
-		}, []string{"1"},
-		map[string]interface{}{"name": "1"},
-		reflect.TypeOf((*IEmployee)(nil)))
-	AddTransientWithLookupKeys[*employee](b,
-		func() *employee {
-			return &employee{Name: "2"}
-		}, []string{"2"},
-		map[string]interface{}{"name": "2"},
-		reflect.TypeOf((*IEmployee)(nil)))
-}
-func AddInstanceEmployeesWithLookupKeys(b ContainerBuilder) {
-	AddInstanceWithLookupKeys[*employee](b,
-		&employee{Name: "1"}, []string{"1"},
-		map[string]interface{}{"name": "1"},
-		reflect.TypeOf((*IEmployee)(nil)))
-	AddInstanceWithLookupKeys[*employee](b,
-		&employee{Name: "2"}, []string{"2"},
-		map[string]interface{}{"name": "2"},
-		reflect.TypeOf((*IEmployee)(nil)))
-}
-func AddScopedHandlersWithLookupKeys(b ContainerBuilder) {
-	AddScopedWithLookupKeys[*handler](b,
-		func() *handler {
-			return &handler{path: "1"}
-		}, []string{"1"}, map[string]interface{}{"name": "1"},
-		reflect.TypeOf((*IHandler)(nil)))
-	AddScopedWithLookupKeys[*handler](b,
-		func() *handler {
-			return &handler{path: "2"}
-		}, []string{"2"}, map[string]interface{}{"name": "2"},
-		reflect.TypeOf((*IHandler)(nil)))
-}
 
 func AddSingletonDepartments(b ContainerBuilder, names ...string) {
 	// pointer to interface type
@@ -313,91 +260,7 @@ func TestSingleton(t *testing.T) {
 	require.Equal(t, "IT", company.GetDepartment().GetName())
 	require.Equal(t, "Contoso", company.GetName())
 }
-func TestManyWithScopeWithLookupKeys(t *testing.T) {
-	b := Builder()
-	// Build the container
-	AddScopedHandlersWithLookupKeys(b)
-	c := b.Build()
-	scopeFactory := Get[ScopeFactory](c)
-	scope1 := scopeFactory.CreateScope()
-	ctn := scope1.Container()
-	descriptors := ctn.GetDescriptors()
-	require.Equal(t, 2, len(descriptors))
-	for _, d := range descriptors {
-		require.NotEmpty(t, d.Metadata)
-		_, ok := d.Metadata["name"]
-		require.True(t, ok)
-		_, ok = d.Metadata["name"].(string)
-		require.True(t, ok)
-
-		fmt.Println(d)
-	}
-	handlers := Get[[]IHandler](ctn)
-	require.Equal(t, 2, len(handlers))
-	require.NotPanics(t, func() {
-		h := GetByLookupKey[IHandler](c, "1")
-		require.NotNil(t, h)
-		require.Equal(t, "1", h.GetPath())
-	})
-}
 
-func TestManyWithSingletonWithLookupKeys(t *testing.T) {
-	b := Builder()
-	// Build the container
-	AddSingletonEmployeesWithLookupKeys(b)
-	c := b.Build()
-	scopeFactory := Get[ScopeFactory](c)
-	scope1 := scopeFactory.CreateScope()
-	employees := Get[[]IEmployee](scope1.Container())
-	require.Equal(t, 3, len(employees))
-	require.NotPanics(t, func() {
-		h := GetByLookupKey[IEmployee](c, "1")
-		require.NotNil(t, h)
-		require.Equal(t, "1", h.GetName())
-	})
-	require.NotPanics(t, func() {
-		h := GetByLookupKey[IEmployee](c, "2")
-		require.NotNil(t, h)
-		require.Equal(t, "2", h.GetName())
-	})
-}
-func TestManyWithTransientWithLookupKeys(t *testing.T) {
-	b := Builder()
-	// Build the container
-	AddTransientEmployeesWithLookupKeys(b)
-	c := b.Build()
-	scopeFactory := Get[ScopeFactory](c)
-	scope1 := scopeFactory.CreateScope()
-	employees := Get[[]IEmployee](scope1.Container())
-	require.Equal(t, 2, len(employees))
-	require.NotPanics(t, func() {
-		h := GetByLookupKey[IEmployee](c, "1")
-		require.NotNil(t, h)
-		require.Equal(t, "1", h.GetName())
-	})
-}
-func TestManyWithInstanceWithLookupKeys(t *testing.T) {
-	b := Builder()
-	// Build the container
-	AddInstanceEmployeesWithLookupKeys(b)
-	c := b.Build()
-	scopeFactory := Get[ScopeFactory](c)
-	scope1 := scopeFactory.CreateScope()
-	employees := Get[[]IEmployee](scope1.Container())
-	require.Equal(t, 2, len(employees))
-	require.NotPanics(t, func() {
-		h := GetByLookupKey[IEmployee](c, "1")
-		require.NotNil(t, h)
-		require.Equal(t, "1", h.GetName())
-	})
-	employeePtrs := Get[[]*employee](scope1.Container())
-	require.Equal(t, 2, len(employeePtrs))
-	require.NotPanics(t, func() {
-		h := GetByLookupKey[*employee](c, "1")
-		require.NotNil(t, h)
-		require.Equal(t, "1", h.GetName())
-	})
-}
 func TestManyWithScope(t *testing.T) {
 	b := Builder()
 	AddSingletonTime(b)