money_test.go

// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package money

import (
	"fmt"
	"reflect"
	"testing"

	pb "github.com/GoogleCloudPlatform/microservices-demo/src/frontend/genproto"
)

func mmc(u int64, n int32, c string) pb.Money { return pb.Money{Units: u, Nanos: n, CurrencyCode: c} }
func mm(u int64, n int32) pb.Money            { return mmc(u, n, "") }

func TestIsValid(t *testing.T) {
	tests := []struct {
		name string
		in   pb.Money
		want bool
	}{
		{"valid -/-", mm(-981273891273, -999999999), true},
		{"invalid -/+", mm(-981273891273, +999999999), false},
		{"valid +/+", mm(981273891273, 999999999), true},
		{"invalid +/-", mm(981273891273, -999999999), false},
		{"invalid +/+overflow", mm(3, 1000000000), false},
		{"invalid +/-overflow", mm(3, -1000000000), false},
		{"invalid -/+overflow", mm(-3, 1000000000), false},
		{"invalid -/-overflow", mm(-3, -1000000000), false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsValid(tt.in); got != tt.want {
				t.Errorf("IsValid(%v) = %v, want %v", tt.in, got, tt.want)
			}
		})
	}
}

func TestIsZero(t *testing.T) {
	tests := []struct {
		name string
		in   pb.Money
		want bool
	}{
		{"zero", mm(0, 0), true},
		{"not-zero (-/+)", mm(-1, +1), false},
		{"not-zero (-/-)", mm(-1, -1), false},
		{"not-zero (+/+)", mm(+1, +1), false},
		{"not-zero (+/-)", mm(+1, -1), false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsZero(tt.in); got != tt.want {
				t.Errorf("IsZero(%v) = %v, want %v", tt.in, got, tt.want)
			}
		})
	}