diff --git a/go-runtime/ftl/call.go b/go-runtime/ftl/call.go
index 57d6e8ded7..c483bab6f1 100644
--- a/go-runtime/ftl/call.go
+++ b/go-runtime/ftl/call.go
@@ -14,12 +14,7 @@ import (
 	"github.com/TBD54566975/ftl/internal/rpc"
 )
 
-func call[Req, Resp any](ctx context.Context, callee Ref, req Req) (resp Resp, err error) {
-	reqData, err := encoding.Marshal(req)
-	if err != nil {
-		return resp, fmt.Errorf("%s: failed to marshal request: %w", callee, err)
-	}
-
+func call[Req, Resp any](ctx context.Context, callee Ref, req Req, inline Verb[Req, Resp]) (resp Resp, err error) {
 	behavior, err := modulecontext.FromContext(ctx).BehaviorForVerb(modulecontext.Ref(callee))
 	if err != nil {
 		return resp, fmt.Errorf("%s: %w", callee, err)
@@ -35,8 +30,17 @@ func call[Req, Resp any](ctx context.Context, callee Ref, req Req) (resp Resp, e
 		}
 		return resp, fmt.Errorf("%s: overridden verb had invalid response type %T, expected %v", callee, uncheckedResp, reflect.TypeFor[Resp]())
 	case modulecontext.DirectBehavior:
-		panic("not implemented")
+		resp, err = inline(ctx, req)
+		if err != nil {
+			return resp, fmt.Errorf("%s: %w", callee, err)
+		}
+		return resp, nil
 	case modulecontext.StandardBehavior:
+		reqData, err := encoding.Marshal(req)
+		if err != nil {
+			return resp, fmt.Errorf("%s: failed to marshal request: %w", callee, err)
+		}
+
 		client := rpc.ClientFromContext[ftlv1connect.VerbServiceClient](ctx)
 		cresp, err := client.Call(ctx, connect.NewRequest(&ftlv1.CallRequest{Verb: callee.ToProto(), Body: reqData}))
 		if err != nil {
@@ -63,22 +67,28 @@ func call[Req, Resp any](ctx context.Context, callee Ref, req Req) (resp Resp, e
 
 // Call a Verb through the FTL Controller.
 func Call[Req, Resp any](ctx context.Context, verb Verb[Req, Resp], req Req) (Resp, error) {
-	return call[Req, Resp](ctx, FuncRef(verb), req)
+	return call[Req, Resp](ctx, FuncRef(verb), req, verb)
 }
 
 // CallSink calls a Sink through the FTL controller.
 func CallSink[Req any](ctx context.Context, sink Sink[Req], req Req) error {
-	_, err := call[Req, Unit](ctx, FuncRef(sink), req)
+	_, err := call[Req, Unit](ctx, FuncRef(sink), req, func(ctx context.Context, req Req) (Unit, error) {
+		return Unit{}, sink(ctx, req)
+	})
 	return err
 }
 
 // CallSource calls a Source through the FTL controller.
 func CallSource[Resp any](ctx context.Context, source Source[Resp]) (Resp, error) {
-	return call[Unit, Resp](ctx, FuncRef(source), Unit{})
+	return call[Unit, Resp](ctx, FuncRef(source), Unit{}, func(ctx context.Context, req Unit) (Resp, error) {
+		return source(ctx)
+	})
 }
 
 // CallEmpty calls a Verb with no request or response through the FTL controller.
 func CallEmpty(ctx context.Context, empty Empty) error {
-	_, err := call[Unit, Unit](ctx, FuncRef(empty), Unit{})
+	_, err := call[Unit, Unit](ctx, FuncRef(empty), Unit{}, func(ctx context.Context, req Unit) (Unit, error) {
+		return Unit{}, empty(ctx)
+	})
 	return err
 }
diff --git a/go-runtime/ftl/config_test.go b/go-runtime/ftl/config_test.go
index 9149703950..145adaa37d 100644
--- a/go-runtime/ftl/config_test.go
+++ b/go-runtime/ftl/config_test.go
@@ -13,7 +13,7 @@ import (
 func TestConfig(t *testing.T) {
 	ctx := log.ContextWithNewDefaultLogger(context.Background())
 
-	moduleCtx := modulecontext.New()
+	moduleCtx := modulecontext.New("test")
 	ctx = moduleCtx.ApplyToContext(ctx)
 
 	type C struct {
diff --git a/go-runtime/ftl/ftltest/ftltest.go b/go-runtime/ftl/ftltest/ftltest.go
index 24349b18be..538169591f 100644
--- a/go-runtime/ftl/ftltest/ftltest.go
+++ b/go-runtime/ftl/ftltest/ftltest.go
@@ -89,3 +89,13 @@ func WhenVerb[Req any, Resp any](verb ftl.Verb[Req, Resp], fake func(ctx context
 		return nil
 	}
 }
+
+// WithCallsAllowedWithinModule allows tests to enable calls to all verbs within the current module
+//
+// Any overrides provided by calling WhenVerb(...) will take precedence
+func WithCallsAllowedWithinModule() func(context.Context) error {
+	return func(ctx context.Context) error {
+		modulecontext.FromContext(ctx).AllowDirectVerbBehaviorWithinModule()
+		return nil
+	}
+}
diff --git a/go-runtime/ftl/secrets_test.go b/go-runtime/ftl/secrets_test.go
index b1079c856e..72df2ba111 100644
--- a/go-runtime/ftl/secrets_test.go
+++ b/go-runtime/ftl/secrets_test.go
@@ -13,7 +13,7 @@ import (
 func TestSecret(t *testing.T) {
 	ctx := log.ContextWithNewDefaultLogger(context.Background())
 
-	moduleCtx := modulecontext.New()
+	moduleCtx := modulecontext.New("test")
 	ctx = moduleCtx.ApplyToContext(ctx)
 
 	type C struct {
diff --git a/go-runtime/modulecontext/from_environment.go b/go-runtime/modulecontext/from_environment.go
index d3d1a12fcb..972e13df7e 100644
--- a/go-runtime/modulecontext/from_environment.go
+++ b/go-runtime/modulecontext/from_environment.go
@@ -18,9 +18,9 @@ func FromEnvironment(ctx context.Context, module string, isTesting bool) (*Modul
 	// TODO: split this func into separate purposes: explicitly reading a particular project file, and reading DSNs from environment
 	var moduleCtx *ModuleContext
 	if isTesting {
-		moduleCtx = NewForTesting()
+		moduleCtx = NewForTesting(module)
 	} else {
-		moduleCtx = New()
+		moduleCtx = New(module)
 	}
 
 	cm, err := cf.NewDefaultConfigurationManagerFromEnvironment(ctx)
diff --git a/go-runtime/modulecontext/from_proto.go b/go-runtime/modulecontext/from_proto.go
index aea15e6787..ebf7a1ef63 100644
--- a/go-runtime/modulecontext/from_proto.go
+++ b/go-runtime/modulecontext/from_proto.go
@@ -5,7 +5,7 @@ import (
 )
 
 func FromProto(response *ftlv1.ModuleContextResponse) (*ModuleContext, error) {
-	moduleCtx := New()
+	moduleCtx := New(response.Module)
 	for name, data := range response.Configs {
 		moduleCtx.configs[name] = data
 	}
diff --git a/go-runtime/modulecontext/module_context.go b/go-runtime/modulecontext/module_context.go
index c1a41ae354..fcf7a8be69 100644
--- a/go-runtime/modulecontext/module_context.go
+++ b/go-runtime/modulecontext/module_context.go
@@ -6,8 +6,10 @@ import (
 	"encoding/json"
 	"fmt"
 	"strconv"
+	"strings"
 
 	ftlv1 "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1"
+
 	_ "github.com/jackc/pgx/v5/stdlib" // SQL driver
 )
 
@@ -41,17 +43,21 @@ func (x DBType) String() string {
 
 // ModuleContext holds the context needed for a module, including configs, secrets and DSNs
 type ModuleContext struct {
-	isTesting bool
+	module    string
 	configs   map[string][]byte
 	secrets   map[string][]byte
 	databases map[string]dbEntry
-	mockVerbs map[Ref]MockVerb
+
+	isTesting               bool
+	mockVerbs               map[Ref]MockVerb
+	allowDirectVerbBehavior bool
 }
 
 type contextKeyModuleContext struct{}
 
-func New() *ModuleContext {
+func New(module string) *ModuleContext {
 	return &ModuleContext{
+		module:    module,
 		configs:   map[string][]byte{},
 		secrets:   map[string][]byte{},
 		databases: map[string]dbEntry{},
@@ -59,8 +65,8 @@ func New() *ModuleContext {
 	}
 }
 
-func NewForTesting() *ModuleContext {
-	moduleCtx := New()
+func NewForTesting(module string) *ModuleContext {
+	moduleCtx := New(module)
 	moduleCtx.isTesting = true
 	return moduleCtx
 }
@@ -164,10 +170,13 @@ func (m *ModuleContext) GetDatabase(name string, dbType DBType) (*sql.DB, error)
 func (m *ModuleContext) BehaviorForVerb(ref Ref) (VerbBehavior, error) {
 	if mock, ok := m.mockVerbs[ref]; ok {
 		return MockBehavior{Mock: mock}, nil
-	}
-	// TODO: add logic here for when to do direct behavior
-	if m.isTesting {
-		return StandardBehavior{}, fmt.Errorf("no mock found")
+	} else if m.allowDirectVerbBehavior && ref.Module == m.module {
+		return DirectBehavior{}, nil
+	} else if m.isTesting {
+		if ref.Module == m.module {
+			return StandardBehavior{}, fmt.Errorf("no mock found: provide a mock with ftltest.WhenVerb(%s, ...) or enable all calls within the module with ftltest.WithCallsAllowedWithinModule()", strings.ToUpper(ref.Name[:1])+ref.Name[1:])
+		}
+		return StandardBehavior{}, fmt.Errorf("no mock found: provide a mock with ftltest.WhenVerb(%s.%s, ...)", ref.Module, strings.ToUpper(ref.Name[:1])+ref.Name[1:])
 	}
 	return StandardBehavior{}, nil
 }
@@ -176,6 +185,10 @@ func (m *ModuleContext) SetMockVerb(ref Ref, mock MockVerb) {
 	m.mockVerbs[ref] = mock
 }
 
+func (m *ModuleContext) AllowDirectVerbBehaviorWithinModule() {
+	m.allowDirectVerbBehavior = true
+}
+
 // VerbBehavior indicates how to execute a verb
 //
 //sumtype:decl
diff --git a/go-runtime/modulecontext/module_context_test.go b/go-runtime/modulecontext/module_context_test.go
index 9818d418d1..92357c92da 100644
--- a/go-runtime/modulecontext/module_context_test.go
+++ b/go-runtime/modulecontext/module_context_test.go
@@ -11,7 +11,7 @@ import (
 
 func TestGettingAndSettingFromContext(t *testing.T) {
 	ctx := log.ContextWithNewDefaultLogger(context.Background())
-	moduleCtx := New()
+	moduleCtx := New("test")
 	ctx = moduleCtx.ApplyToContext(ctx)
 	assert.Equal(t, moduleCtx, FromContext(ctx), "module context should be the same when read from context")
 }
diff --git a/integration/actions_test.go b/integration/actions_test.go
index 9ed122138f..18e1acd32e 100644
--- a/integration/actions_test.go
+++ b/integration/actions_test.go
@@ -144,6 +144,13 @@ func deploy(module string) action {
 	)
 }
 
+// Build modules from the working directory and wait for it to become available.
+func build(modules ...string) action {
+	args := []string{"build"}
+	args = append(args, modules...)
+	return exec("ftl", args...)
+}
+
 // wait for the given module to deploy.
 func wait(module string) action {
 	return func(t testing.TB, ic testContext) error {
@@ -346,3 +353,7 @@ func httpCall(method string, path string, body []byte, onResponse func(resp *htt
 		})
 	}
 }
+
+func testModule(module string) action {
+	return chdir(module, exec("go", "test", "-v", "."))
+}
diff --git a/integration/integration_test.go b/integration/integration_test.go
index 60c3ae3fff..1670d2741b 100644
--- a/integration/integration_test.go
+++ b/integration/integration_test.go
@@ -212,6 +212,15 @@ func TestHttpIngress(t *testing.T) {
 func TestRuntimeReflection(t *testing.T) {
 	run(t,
 		copyModule("runtimereflection"),
-		chdir("runtimereflection", exec("go", "test", "-v", ".")),
+		testModule("runtimereflection"),
+	)
+}
+
+func TestModuleUnitTests(t *testing.T) {
+	run(t,
+		copyModule("time"),
+		copyModule("wrapped"),
+		build("time", "wrapped"),
+		testModule("wrapped"),
 	)
 }
diff --git a/integration/testdata/go/wrapped/ftl.toml b/integration/testdata/go/wrapped/ftl.toml
new file mode 100644
index 0000000000..7f47362c94
--- /dev/null
+++ b/integration/testdata/go/wrapped/ftl.toml
@@ -0,0 +1,2 @@
+module = "wrapped"
+language = "go"
diff --git a/integration/testdata/go/wrapped/go.mod b/integration/testdata/go/wrapped/go.mod
new file mode 100644
index 0000000000..bcb01a97eb
--- /dev/null
+++ b/integration/testdata/go/wrapped/go.mod
@@ -0,0 +1,51 @@
+module ftl/wrapped
+
+go 1.22.2
+
+require (
+	github.com/TBD54566975/ftl v0.193.0
+	github.com/alecthomas/assert/v2 v2.9.0
+)
+
+require (
+	connectrpc.com/connect v1.14.0 // indirect
+	connectrpc.com/grpcreflect v1.2.0 // indirect
+	connectrpc.com/otelconnect v0.7.0 // indirect
+	github.com/BurntSushi/toml v1.3.2 // indirect
+	github.com/TBD54566975/scaffolder v0.8.0 // indirect
+	github.com/alecthomas/concurrency v0.0.2 // indirect
+	github.com/alecthomas/kong v0.9.0 // indirect
+	github.com/alecthomas/participle/v2 v2.1.1 // indirect
+	github.com/alecthomas/repr v0.4.0 // indirect
+	github.com/alecthomas/types v0.14.0 // indirect
+	github.com/alessio/shellescape v1.4.2 // indirect
+	github.com/danieljoos/wincred v1.2.0 // indirect
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/hexops/gotextdiff v1.0.3 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgx/v5 v5.5.5 // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/multiformats/go-base36 v0.2.0 // indirect
+	github.com/swaggest/jsonschema-go v0.3.70 // indirect
+	github.com/swaggest/refl v1.3.0 // indirect
+	github.com/zalando/go-keyring v0.2.4 // indirect
+	go.opentelemetry.io/otel v1.26.0 // indirect
+	go.opentelemetry.io/otel/metric v1.26.0 // indirect
+	go.opentelemetry.io/otel/trace v1.26.0 // indirect
+	golang.org/x/crypto v0.22.0 // indirect
+	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.24.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.19.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
+)
+
+replace github.com/TBD54566975/ftl => ../../../..
diff --git a/integration/testdata/go/wrapped/go.sum b/integration/testdata/go/wrapped/go.sum
new file mode 100644
index 0000000000..da511de1e8
--- /dev/null
+++ b/integration/testdata/go/wrapped/go.sum
@@ -0,0 +1,142 @@
+connectrpc.com/connect v1.14.0 h1:PDS+J7uoz5Oui2VEOMcfz6Qft7opQM9hPiKvtGC01pA=
+connectrpc.com/connect v1.14.0/go.mod h1:uoAq5bmhhn43TwhaKdGKN/bZcGtzPW1v+ngDTn5u+8s=
+connectrpc.com/grpcreflect v1.2.0 h1:Q6og1S7HinmtbEuBvARLNwYmTbhEGRpHDhqrPNlmK+U=
+connectrpc.com/grpcreflect v1.2.0/go.mod h1:nwSOKmE8nU5u/CidgHtPYk1PFI3U9ignz7iDMxOYkSY=
+connectrpc.com/otelconnect v0.7.0 h1:ZH55ZZtcJOTKWWLy3qmL4Pam4RzRWBJFOqTPyAqCXkY=
+connectrpc.com/otelconnect v0.7.0/go.mod h1:Bt2ivBymHZHqxvo4HkJ0EwHuUzQN6k2l0oH+mp/8nwc=
+github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
+github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/TBD54566975/scaffolder v0.8.0 h1:DWl1K3dWcLsOPAYGQGPQXtffrml6XCB0tF05JdpMqZU=
+github.com/TBD54566975/scaffolder v0.8.0/go.mod h1:Ab/jbQ4q8EloYL0nbkdh2DVvkGc4nxr1OcIbdMpTxxg=
+github.com/alecthomas/assert/v2 v2.9.0 h1:ZcLG8ccMEtlMLkLW4gwGpBWBb0N8MUCmsy1lYBVd1xQ=
+github.com/alecthomas/assert/v2 v2.9.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
+github.com/alecthomas/concurrency v0.0.2 h1:Q3kGPtLbleMbH9lHX5OBFvJygfyFw29bXZKBg+IEVuo=
+github.com/alecthomas/concurrency v0.0.2/go.mod h1:GmuQb/iHX7mbNtPlC/WDzEFxDMB0HYFer2Qda9QTs7w=
+github.com/alecthomas/kong v0.9.0 h1:G5diXxc85KvoV2f0ZRVuMsi45IrBgx9zDNGNj165aPA=
+github.com/alecthomas/kong v0.9.0/go.mod h1:Y47y5gKfHp1hDc7CH7OeXgLIpp+Q2m1Ni0L5s3bI8Os=
+github.com/alecthomas/participle/v2 v2.1.1 h1:hrjKESvSqGHzRb4yW1ciisFJ4p3MGYih6icjJvbsmV8=
+github.com/alecthomas/participle/v2 v2.1.1/go.mod h1:Y1+hAs8DHPmc3YUFzqllV+eSQ9ljPTk0ZkPMtEdAx2c=
+github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
+github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/alecthomas/types v0.14.0 h1:4pCdEWVctLZQP9dE48fCyXWYkcoQtkf1EAxx9xGfCRY=
+github.com/alecthomas/types v0.14.0/go.mod h1:fIOGnLeeUJXe1AAVofQmMaEMWLxY9bK4QxTLGIo30PA=
+github.com/alessio/shellescape v1.4.2 h1:MHPfaU+ddJ0/bYWpgIeUnQUqKrlJ1S7BfEYPM4uEoM0=
+github.com/alessio/shellescape v1.4.2/go.mod h1:PZAiSCk0LJaZkiCSkPv8qIobYglO3FPpyFjDCtHLS30=
+github.com/bool64/dev v0.2.34 h1:P9n315P8LdpxusnYQ0X7MP1CZXwBK5ae5RZrd+GdSZE=
+github.com/bool64/dev v0.2.34/go.mod h1:iJbh1y/HkunEPhgebWRNcs8wfGq7sjvJ6W5iabL8ACg=
+github.com/bool64/shared v0.1.5 h1:fp3eUhBsrSjNCQPcSdQqZxxh9bBwrYiZ+zOKFkM0/2E=
+github.com/bool64/shared v0.1.5/go.mod h1:081yz68YC9jeFB3+Bbmno2RFWvGKv1lPKkMP6MHJlPs=
+github.com/danieljoos/wincred v1.2.0 h1:ozqKHaLK0W/ii4KVbbvluM91W2H3Sh0BncbUNPS7jLE=
+github.com/danieljoos/wincred v1.2.0/go.mod h1:FzQLLMKBFdvu+osBrnFODiv32YGwCfx0SkRa/eYHgec=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
+github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
+github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
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diff --git a/integration/testdata/go/wrapped/wrapped.go b/integration/testdata/go/wrapped/wrapped.go
new file mode 100644
index 0000000000..c94e54790c
--- /dev/null
+++ b/integration/testdata/go/wrapped/wrapped.go
@@ -0,0 +1,40 @@
+package wrapped
+
+import (
+	"context"
+	"fmt"
+	"ftl/time"
+
+	"github.com/TBD54566975/ftl/go-runtime/ftl" // Import the FTL SDK.
+)
+
+// Wrapped module provides 2 verbs: Outer and Inner.
+// Outer calls Inner and Inner calls time.Time.
+// This module is useful to testing mocking verbs and setting up test config and secrets
+
+var mySecret = ftl.Secret[string]("secret")
+var myConfig = ftl.Config[string]("config")
+
+type WrappedResponse struct {
+	Output string `json:"output"`
+	Secret string `json:"secret"`
+	Config string `json:"config"`
+}
+
+//ftl:verb
+func Outer(ctx context.Context) (WrappedResponse, error) {
+	return ftl.CallSource(ctx, Inner)
+}
+
+//ftl:verb
+func Inner(ctx context.Context) (WrappedResponse, error) {
+	resp, err := ftl.Call(ctx, time.Time, time.TimeRequest{})
+	if err != nil {
+		return WrappedResponse{}, err
+	}
+	return WrappedResponse{
+		Output: fmt.Sprintf("%v", resp.Time),
+		Config: myConfig.Get(ctx),
+		Secret: mySecret.Get(ctx),
+	}, nil
+}
diff --git a/integration/testdata/go/wrapped/wrapped_test.go b/integration/testdata/go/wrapped/wrapped_test.go
new file mode 100644
index 0000000000..9df52687e7
--- /dev/null
+++ b/integration/testdata/go/wrapped/wrapped_test.go
@@ -0,0 +1,62 @@
+package wrapped
+
+import (
+	"context"
+	"ftl/time"
+	"testing"
+	stdtime "time"
+
+	"github.com/TBD54566975/ftl/go-runtime/ftl"
+	"github.com/TBD54566975/ftl/go-runtime/ftl/ftltest"
+	"github.com/alecthomas/assert/v2"
+)
+
+func TestWrapped(t *testing.T) {
+	allOptions := []func(context.Context) error{
+		ftltest.WithConfig(myConfig, "helloworld"),
+		ftltest.WithSecret(mySecret, "shhhhh"),
+		ftltest.WithCallsAllowedWithinModule(),
+		ftltest.WhenVerb(time.Time, func(ctx context.Context, req time.TimeRequest) (time.TimeResponse, error) {
+			return time.TimeResponse{Time: stdtime.Date(2024, 1, 1, 0, 0, 0, 0, stdtime.UTC)}, nil
+		}),
+	}
+
+	for _, tt := range []struct {
+		name          string
+		options       []func(context.Context) error
+		expectedError ftl.Option[string]
+	}{
+		{
+			name:          "OnlyConfigAndSecret",
+			options:       allOptions[:2],
+			expectedError: ftl.Some("wrapped.inner: no mock found: provide a mock with ftltest.WhenVerb(Inner, ...) or enable all calls within the module with ftltest.WithCallsAllowedWithinModule()"),
+		},
+		{
+			name:          "AllowCallsWithinModule",
+			options:       allOptions[:3],
+			expectedError: ftl.Some("wrapped.inner: time.time: no mock found: provide a mock with ftltest.WhenVerb(time.Time, ...)"),
+		},
+		{
+			name:    "WithExternalVerbMock",
+			options: allOptions[:4],
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			ctx := ftltest.Context(
+				tt.options...,
+			)
+			myConfig.Get(ctx)
+			resp, err := Outer(ctx)
+
+			if expected, ok := tt.expectedError.Get(); ok {
+				assert.EqualError(t, err, expected)
+				return
+			} else {
+				assert.NoError(t, err)
+			}
+			assert.Equal(t, "2024-01-01 00:00:00 +0000 UTC", resp.Output)
+			assert.Equal(t, "helloworld", resp.Config)
+			assert.Equal(t, "shhhhh", resp.Secret)
+		})
+	}
+}