impl: move testdata

Move all testdata to one location.

generator/README.md

@@ -13,13 +13,13 @@ go run ./devtools/cmd/generate -language=rust
 Alternatively, you can run the protoc command directly:
 
 ```bash
-go install github.com/googleapis/google-cloud-rust/generator/cmd/protoc-gen-gclient
-protoc -I cmd/protoc-gen-gclient/testdata/smprotos \
-    -I /path/to/googleapis \
+go install ./cmd/protoc-gen-gclient
+
+protoc -I testdata/googleapis \
     --gclient_out=. \
     --gclient_opt=capture-input=true,language=rust \
-    cmd/protoc-gen-gclient/testdata/smprotos/resources.proto \
-    cmd/protoc-gen-gclient/testdata/smprotos/service.proto
+    testdata/googleapis/google/cloud/secretmanager/v1/resources.proto \
+    testdata/googleapis/google/cloud/secretmanager/v1/service.proto
 ```
 
 or to playback an old input without the need for `protoc`:

generator/cmd/openapi/main_test.go

@@ -26,7 +26,13 @@ func TestMain(m *testing.M) {
 }
 
 func TestRun_Rust(t *testing.T) {
-	if err := run("testdata/secretmanager_openapi_v1.json", "rust", "testdata/rust/golden", "../../templates"); err != nil {
+	const (
+		inputPath   = "../../testdata/openapi/secretmanager_openapi_v1.json"
+		language    = "rust"
+		outDir      = "../../testdata/rust/openapi/golden"
+		templateDir = "../../templates"
+	)
+	if err := run(inputPath, language, outDir, templateDir); err != nil {
 		t.Fatal(err)
 	}
 }

generator/cmd/protoc-gen-gclient/main_test.go

@@ -26,7 +26,7 @@ func TestMain(m *testing.M) {
 }
 
 func TestRun_Rust(t *testing.T) {
-	if err := run("testdata/rust/rust.bin", "testdata/rust/golden", "../../templates"); err != nil {
+	if err := run("../../testdata/rust/gclient/rust.bin", "../../testdata/rust/gclient/golden", "../../templates"); err != nil {
 		t.Fatal(err)
 	}
 }