wire/tests: add a test for multiple args of the same type to an injector function (google/go-cloud#706)

internal/wire/testdata/MultipleArgsSameType/foo/foo.go

@@ -0,0 +1,31 @@
+// 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() {
+	fmt.Println(inject("foo", "bar").A)
+}
+
+type Foo struct {
+	A string
+}
+
+func provideFoo(a string) *Foo {
+	return &Foo{A: a}
+}

internal/wire/testdata/MultipleArgsSameType/foo/wire.go

@@ -0,0 +1,26 @@
+// 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 inject(a, b string) *Foo {
+	// fail: can't have two args of the same type.
+	panic(wire.Build(provideFoo))
+}

internal/wire/testdata/MultipleArgsSameType/pkg

@@ -0,0 +1 @@
+example.com/foo

internal/wire/testdata/MultipleArgsSameType/want/wire_errs.txt

@@ -0,0 +1 @@
+example.com/foo/wire.go:x:y: inject inject: multiple inputs of the same type string