e2e_node: DRA: add CountCalls API

test/e2e/dra/test-driver/app/kubeletplugin.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 
 	"github.com/google/go-cmp/cmp"
@@ -545,3 +546,14 @@ func (ex *ExamplePlugin) GetGRPCCalls() []GRPCCall {
 	calls = append(calls, ex.gRPCCalls...)
 	return calls
 }
+
+// CountCalls counts GRPC calls with the given method suffix.
+func (ex *ExamplePlugin) CountCalls(methodSuffix string) int {
+	count := 0
+	for _, call := range ex.GetGRPCCalls() {
+		if strings.HasSuffix(call.FullMethod, methodSuffix) {
+			count += 1
+		}
+	}
+	return count
+}