spanner/internal/testutil: delete FuncMock

Nothing uses it.

Change-Id: Ie35d55d558c52550f76375877f799417c925fd8a
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/43012
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/spanner/internal/testutil/funcmock.go b/spanner/internal/testutil/funcmock.go
deleted file mode 100644
index 2536afc..0000000
--- a/spanner/internal/testutil/funcmock.go
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
-Copyright 2018 Google LLC
-
-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
-
-    http://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 testutil
-
-import (
-	"context"
-
-	sppb "google.golang.org/genproto/googleapis/spanner/v1"
-	"google.golang.org/grpc"
-)
-
-// FuncMock overloads some of MockCloudSpannerClient's methods with pluggable
-// functions.
-//
-// Note: if you overload a method, you're in charge of making sure
-// MockCloudSpannerClient.ReceivedRequests receives the request appropriately.
-type FuncMock struct {
-	CommitFn           func(ctx context.Context, r *sppb.CommitRequest, opts ...grpc.CallOption) (*sppb.CommitResponse, error)
-	BeginTransactionFn func(ctx context.Context, r *sppb.BeginTransactionRequest, opts ...grpc.CallOption) (*sppb.Transaction, error)
-	GetSessionFn       func(ctx context.Context, r *sppb.GetSessionRequest, opts ...grpc.CallOption) (*sppb.Session, error)
-	CreateSessionFn    func(ctx context.Context, r *sppb.CreateSessionRequest, opts ...grpc.CallOption) (*sppb.Session, error)
-	*MockCloudSpannerClient
-}
-
-func (s FuncMock) Commit(ctx context.Context, r *sppb.CommitRequest, opts ...grpc.CallOption) (*sppb.CommitResponse, error) {
-	if s.CommitFn == nil {
-		return s.MockCloudSpannerClient.Commit(ctx, r, opts...)
-	}
-	return s.CommitFn(ctx, r, opts...)
-}
-
-func (s FuncMock) BeginTransaction(ctx context.Context, r *sppb.BeginTransactionRequest, opts ...grpc.CallOption) (*sppb.Transaction, error) {
-	if s.BeginTransactionFn == nil {
-		return s.MockCloudSpannerClient.BeginTransaction(ctx, r, opts...)
-	}
-	return s.BeginTransactionFn(ctx, r, opts...)
-}
-
-func (s *FuncMock) GetSession(ctx context.Context, r *sppb.GetSessionRequest, opts ...grpc.CallOption) (*sppb.Session, error) {
-	if s.GetSessionFn == nil {
-		return s.MockCloudSpannerClient.GetSession(ctx, r, opts...)
-	}
-	return s.GetSessionFn(ctx, r, opts...)
-}
-
-func (s *FuncMock) CreateSession(c context.Context, r *sppb.CreateSessionRequest, opts ...grpc.CallOption) (*sppb.Session, error) {
-	if s.CreateSessionFn == nil {
-		return s.MockCloudSpannerClient.CreateSession(c, r, opts...)
-	}
-	return s.CreateSessionFn(c, r, opts...)
-}