added testing for auto-pause-interval validation

cmd/minikube/cmd/start.go

@@ -1250,7 +1250,7 @@ func validateCPUCount(drvName string) {
 }
 
 // validateFlags validates the supplied flags against known bad combinations
-func validateFlags(cmd *cobra.Command, drvName string) {
+func validateFlags(cmd *cobra.Command, drvName string) { //nolint:gocyclo
 	if cmd.Flags().Changed(humanReadableDiskSize) {
 		err := validateDiskSize(viper.GetString(humanReadableDiskSize))
 		if err != nil {

cmd/minikube/cmd/start_test.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/blang/semver/v4"
 	"github.com/spf13/cobra"
@@ -888,3 +889,29 @@ func TestValidateGPUs(t *testing.T) {
 		}
 	}
 }
+
+func TestValidateAutoPause(t *testing.T) {
+	tests := []struct {
+		interval    string
+		shouldError bool
+	}{
+		{"1m0s", false},
+		{"5m", false},
+		{"1s", false},
+		{"0s", true},
+		{"-2m", true},
+	}
+	for _, tc := range tests {
+		input, err := time.ParseDuration(tc.interval)
+		if err != nil {
+			t.Fatalf("test has an invalid input duration of %q", tc.interval)
+		}
+		err = validateAutoPauseInterval(input)
+		if err != nil && !tc.shouldError {
+			t.Errorf("interval of %q failed validation; expected it to pass: %v", input, err)
+		}
+		if err == nil && tc.shouldError {
+			t.Errorf("interval of %q passed validataion; expected it to fail: %v", input, err)
+		}
+	}
+}