util: add health-checker for periodic filesystem checks

Signed-off-by: Niels de Vos <ndevos@ibm.com>

internal/health-checker/statchecker_test.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2023 ceph-csi 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.
+*/
+
+package healthchecker
+
+import (
+	"testing"
+	"time"
+)
+
+func TestStatChecker(t *testing.T) {
+	t.Parallel()
+
+	volumePath := t.TempDir()
+	sc := newStatChecker(volumePath)
+	checker, ok := sc.(*statChecker)
+	if !ok {
+		t.Errorf("failed to convert fc to *fileChecker: %v", sc)
+	}
+	checker.interval = time.Second * 5
+
+	// start the checker
+	checker.start()
+
+	// wait a second to get the go routine running
+	time.Sleep(time.Second)
+	if !checker.isRunning {
+		t.Error("checker failed to start")
+	}
+
+	for i := 0; i < 10; i++ {
+		// check health, should be healthy
+		healthy, msg := checker.isHealthy()
+		if !healthy || msg != nil {
+			t.Error("volume is unhealthy")
+		}
+
+		time.Sleep(time.Second)
+	}
+
+	if !checker.isRunning {
+		t.Error("runChecker() exited already")
+	}
+
+	// stop the checker
+	checker.stop()
+}