Unit Tests for Fund ValidateBasic and Drip function (#100)

* Test: add test for fund ValidateBasic

* Test: add test for Airdrop Drip

* Tidy: Goimports-ed

* Test: add test for MsgValidateBasic

* Refactor: remove junk test code

x/airdrop/types/airdrop_test.go

@@ -0,0 +1,56 @@
+package types
+
+import (
+	"fmt"
+	"testing"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/stretchr/testify/require"
+)
+
+var (
+	addr = sdk.AccAddress([]byte("addr________________"))
+	addrInvalid = sdk.AccAddress([]byte(""))
+)
+
+func TestFundValidateBasic(t *testing.T) {
+	amount := sdk.NewInt64Coin("test", 1)
+	fundPosDrip := Fund{
+		Amount:     &amount,
+		DripAmount: sdk.NewInt(1),
+	}
+	fundNilDrip := Fund{
+		Amount:     &amount,
+		DripAmount: sdk.NewInt(0),
+	}
+	fundNegDrip := Fund{
+		Amount:     &amount,
+		DripAmount: sdk.NewInt(-1),
+	}
+	require.NoError(t, fundPosDrip.ValidateBasic())
+	require.Error(t, fundNilDrip.ValidateBasic())
+	require.Error(t, fundNegDrip.ValidateBasic())
+}
+
+func TestFundDrip(t *testing.T) {
+	amount := sdk.NewInt64Coin("test", 10)
+	fund := Fund{
+		Amount:     &amount,
+		DripAmount: sdk.NewInt(2),
+	}
+	fundHighDrip := Fund{
+		Amount:     &amount,
+		DripAmount: sdk.NewInt(100),
+	}
+	fund, _ = fund.Drip()
+	fundHighDrip, _ = fundHighDrip.Drip()
+	fmt.Println(fundHighDrip.Amount.Amount)
+	require.Equal(t, fund.Amount.Amount, sdk.NewInt(8))
+	require.Equal(t, fundHighDrip.Amount.Amount.Int64(), int64(0))
+}
+
+func TestMsgAirdropValidateBasic (t *testing.T) {
+	amount := sdk.NewInt64Coin("test", 100)
+	require.NoError(t, NewMsgAirDrop(addr, amount, sdk.NewInt(20)).ValidateBasic())
+	require.Error(t, NewMsgAirDrop(addrInvalid, amount, sdk.NewInt(20)).ValidateBasic())
+}