diff --git a/internal/wire/testdata/InjectorMissingCleanup/foo/foo.go b/internal/wire/testdata/InjectorMissingCleanup/foo/foo.go
new file mode 100644
index 0000000..1624c83
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingCleanup/foo/foo.go
@@ -0,0 +1,30 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	foo := injectFoo()
+	fmt.Println(foo)
+}
+
+type Foo int
+
+func provideFoo() (Foo, func()) {
+	return Foo(42), func() {}
+}
diff --git a/internal/wire/testdata/InjectorMissingCleanup/foo/wire.go b/internal/wire/testdata/InjectorMissingCleanup/foo/wire.go
new file mode 100644
index 0000000..a676cbe
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingCleanup/foo/wire.go
@@ -0,0 +1,27 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build wireinject
+
+package main
+
+import (
+	"github.com/google/go-cloud/wire"
+)
+
+func injectFoo() Foo {
+	// provideFoo returns a cleanup, but injectFoo does not.
+	wire.Build(provideFoo)
+	return Foo(0)
+}
diff --git a/internal/wire/testdata/InjectorMissingCleanup/pkg b/internal/wire/testdata/InjectorMissingCleanup/pkg
new file mode 100644
index 0000000..f7a5c8c
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingCleanup/pkg
@@ -0,0 +1 @@
+example.com/foo
diff --git a/internal/wire/testdata/InjectorMissingCleanup/want/wire_errs.txt b/internal/wire/testdata/InjectorMissingCleanup/want/wire_errs.txt
new file mode 100644
index 0000000..336ff3c
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingCleanup/want/wire_errs.txt
@@ -0,0 +1 @@
+provider for example.com/foo.Foo returns cleanup but injection does not return cleanup function
diff --git a/internal/wire/testdata/InjectorMissingError/foo/foo.go b/internal/wire/testdata/InjectorMissingError/foo/foo.go
new file mode 100644
index 0000000..d63b5ab
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingError/foo/foo.go
@@ -0,0 +1,30 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	foo := injectFoo()
+	fmt.Println(foo)
+}
+
+type Foo int
+
+func provideFoo() (Foo, error) {
+	return Foo(42), nil
+}
diff --git a/internal/wire/testdata/InjectorMissingError/foo/wire.go b/internal/wire/testdata/InjectorMissingError/foo/wire.go
new file mode 100644
index 0000000..25acc30
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingError/foo/wire.go
@@ -0,0 +1,27 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build wireinject
+
+package main
+
+import (
+	"github.com/google/go-cloud/wire"
+)
+
+func injectFoo() Foo {
+	// provideFoo returns an error, but injectFoo does not.
+	wire.Build(provideFoo)
+	return Foo(0)
+}
diff --git a/internal/wire/testdata/InjectorMissingError/pkg b/internal/wire/testdata/InjectorMissingError/pkg
new file mode 100644
index 0000000..f7a5c8c
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingError/pkg
@@ -0,0 +1 @@
+example.com/foo
diff --git a/internal/wire/testdata/InjectorMissingError/want/wire_errs.txt b/internal/wire/testdata/InjectorMissingError/want/wire_errs.txt
new file mode 100644
index 0000000..6874f1e
--- /dev/null
+++ b/internal/wire/testdata/InjectorMissingError/want/wire_errs.txt
@@ -0,0 +1 @@
+provider for example.com/foo.Foo returns error but injection not allowed to fail