Address PR comments: test descriptions & NewValidatorSigningInfo

x/slashing/keeper.go

@@ -58,8 +58,8 @@ func (k Keeper) handleValidatorSignature(ctx sdk.Context, pubkey crypto.PubKey,
 	// Will use the 0-value default signing info if not present, except for start height
 	signInfo, found := k.getValidatorSigningInfo(ctx, address)
 	if !found {
-		// If this validator has never been seen before, set the start height
-		signInfo.StartHeight = height
+		// If this validator has never been seen before, construct a new SigningInfo with the correct start height
+		signInfo = NewValidatorSigningInfo(height, 0, 0, 0)
 	}
 	index := signInfo.IndexOffset % SignedBlocksWindow
 	signInfo.IndexOffset++

x/slashing/keeper_test.go

@@ -11,6 +11,8 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/stake"
 )
 
+// Test that a validator is slashed correctly
+// when we discover evidence of equivocation
 func TestHandleDoubleSign(t *testing.T) {
 
 	// initial setup
@@ -32,6 +34,8 @@ func TestHandleDoubleSign(t *testing.T) {
 	require.Equal(t, sdk.NewRat(amt).Mul(sdk.NewRat(19).Quo(sdk.NewRat(20))), sk.Validator(ctx, addr).GetPower())
 }
 
+// Test a validator through uptime, downtime, revocation,
+// unrevocation, starting height reset, and revocation again
 func TestHandleAbsentValidator(t *testing.T) {
 
 	// initial setup
@@ -130,6 +134,9 @@ func TestHandleAbsentValidator(t *testing.T) {
 	require.Equal(t, sdk.Unbonded, validator.GetStatus())
 }
 
+// Test a new validator entering the validator set
+// Ensure that SigningInfo.StartHeight is set correctly
+// and that they are not immediately revoked
 func TestHandleNewValidator(t *testing.T) {
 	// initial setup
 	ctx, ck, sk, keeper := createTestInput(t)

x/slashing/signing_info.go

@@ -47,6 +47,16 @@ func (k Keeper) setValidatorSigningBitArray(ctx sdk.Context, address sdk.Address
 	store.Set(GetValidatorSigningBitArrayKey(address, index), bz)
 }
 
+// Construct a new `ValidatorSigningInfo` struct
+func NewValidatorSigningInfo(startHeight int64, indexOffset int64, jailedUntil int64, signedBlocksCounter int64) ValidatorSigningInfo {
+	return ValidatorSigningInfo{
+		StartHeight:         startHeight,
+		IndexOffset:         indexOffset,
+		JailedUntil:         jailedUntil,
+		SignedBlocksCounter: signedBlocksCounter,
+	}
+}
+
 // Signing info for a validator
 type ValidatorSigningInfo struct {
 	StartHeight         int64 `json:"start_height"`          // height at which validator was first a candidate OR was unrevoked