file: add file collector to scrape file size and file modify time which can replace filetime collector (#2205)

Co-authored-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/collector/file/file_test.go

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright The Prometheus 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
+//
+// 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.
+
+//go:build windows
+
+package file_test
+
+import (
+	"testing"
+
+	"github.com/prometheus-community/windows_exporter/internal/collector/file"
+	"github.com/prometheus-community/windows_exporter/internal/utils/testutils"
+)
+
+func BenchmarkCollector(b *testing.B) {
+	testutils.FuncBenchmarkCollector(b, file.Name, file.NewWithFlags)
+}
+
+func TestCollector(t *testing.T) {
+	testutils.TestCollector(t, file.New, &file.Config{
+		FilePatterns: []string{"*.*"},
+	})
+}