update vest-calc tests with a short 20sec period

x/colinearcore/math/vesting_test.go

@@ -60,7 +60,7 @@ func TestLinearVesting(t *testing.T) {
 	// Total: 1000 tokens
 	// Time: end
 	// Claimed: 1000
-	// Expected: 1000
+	// Expected: 0
 	if res, err := CalcAmountVestableLinear(
 		big.NewInt(1000),
 		big.NewInt(0),
@@ -105,8 +105,24 @@ func TestLinearVesting(t *testing.T) {
 		expectEq(res, 416)
 	}
 
+	// Total: 1000 tokens
+	// Time: 20 sec in of a 3700sec lease
+	// Claimed: 1000
+	// Expected: 0
+	if res, err := CalcAmountVestableLinear(
+		big.NewInt(1000),
+		big.NewInt(1000),
+		time.Now(),
+		time.Unix(time.Now().Unix()-20, 0),
+		time.Unix(time.Now().Unix()+3680, 0),
+	); err != nil {
+		panic(err)
+	} else {
+		expectEq(res, 5)
+	}
 }
 
+// Compare a bigint output to its expected int value
 func expectEq(a *big.Int, b int) {
 	a2 := int(a.Uint64())
 	if a2 != b {