store/types: Fix pruning opts validation

store/types/pruning.go

@@ -47,12 +47,15 @@ func NewPruningOptions(keepRecent, keepEvery, interval uint64) PruningOptions {
 }
 
 func (po PruningOptions) Validate() error {
-	if po.KeepRecent == 0 && po.KeepEvery == 0 && po.Interval == 0 { // prune everything
+	if po.KeepEvery == 0 && po.Interval == 0 {
 		return fmt.Errorf("invalid 'Interval' when pruning everything: %d", po.Interval)
 	}
-	if po.KeepRecent == 0 && po.KeepEvery == 1 && po.Interval != 0 { // prune nothing
+	if po.KeepEvery == 1 && po.Interval != 0 { // prune nothing
 		return fmt.Errorf("invalid 'Interval' when pruning nothing: %d", po.Interval)
 	}
+	if po.KeepEvery > 1 && po.Interval == 0 {
+		return fmt.Errorf("invalid 'Interval' when pruning: %d", po.Interval)
+	}
 
 	return nil
 }

store/types/pruning_test.go

@@ -0,0 +1,29 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPruningOptions_Validate(t *testing.T) {
+	testCases := []struct {
+		keepRecent uint64
+		keepEvery  uint64
+		interval   uint64
+		expectErr  bool
+	}{
+		{100, 500, 10, false}, // default
+		{0, 0, 10, false},     // everything
+		{0, 1, 0, false},      // nothing
+		{0, 10, 10, false},
+		{100, 0, 0, true}, // invalid interval
+		{0, 1, 5, true},   // invalid interval
+	}
+
+	for _, tc := range testCases {
+		po := NewPruningOptions(tc.keepRecent, tc.keepEvery, tc.interval)
+		err := po.Validate()
+		require.Equal(t, tc.expectErr, err != nil, "options: %v, err: %s", po, err)
+	}
+}