message: stargate: Add test for calculateFee
diff: import { Decimal } from "@cosmjs/math";
  -import { GasPrice } from "./fee";
  +import { calculateFee, GasPrice } from "./fee";
  describe("GasPrice", () => {
  it("can be constructed", () => {
  @@ -59,3 +59,15 @@ describe("GasPrice", () => {
  });
  });
  });
  +
  +describe("calculateFee", () => {
  + it("multiplies the gas price by the gas limit", () => {
  + const gasLimit = 80000;
  + const gasPrice = GasPrice.fromString("0.025ucosm");
  + const fee = calculateFee(gasLimit, gasPrice);
  + expect(fee).toEqual({
  + amount: [{ amount: "2000", denom: "ucosm" }],
  + gas: "80000",
  + });
  + });
  +});
  