stack_wallet/test/utilities/amount/amount_test.dart

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import 'package:decimal/decimal.dart';
import 'package:flutter_test/flutter_test.dart';
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import 'package:stackwallet/utilities/amount/amount.dart';
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void main() {
test("Basic Amount Constructor tests", () {
Amount amount = Amount(rawValue: BigInt.two, fractionDigits: 0);
expect(amount.fractionDigits, 0);
expect(amount.raw, BigInt.two);
expect(amount.decimal, Decimal.fromInt(2));
amount = Amount(rawValue: BigInt.two, fractionDigits: 2);
expect(amount.fractionDigits, 2);
expect(amount.raw, BigInt.two);
expect(amount.decimal, Decimal.parse("0.02"));
amount = Amount(rawValue: BigInt.from(123456789), fractionDigits: 7);
expect(amount.fractionDigits, 7);
expect(amount.raw, BigInt.from(123456789));
expect(amount.decimal, Decimal.parse("12.3456789"));
bool didThrow = false;
try {
amount = Amount(rawValue: BigInt.one, fractionDigits: -1);
} catch (_) {
didThrow = true;
}
expect(didThrow, true);
});
test("Named fromDecimal Amount Constructor tests", () {
Amount amount = Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: 0);
expect(amount.fractionDigits, 0);
expect(amount.raw, BigInt.two);
expect(amount.decimal, Decimal.fromInt(2));
amount = Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: 2);
expect(amount.fractionDigits, 2);
expect(amount.raw, BigInt.from(200));
expect(amount.decimal, Decimal.fromInt(2));
amount =
Amount.fromDecimal(Decimal.parse("0.0123456789"), fractionDigits: 7);
expect(amount.fractionDigits, 7);
expect(amount.raw, BigInt.from(123456));
expect(amount.decimal, Decimal.parse("0.0123456"));
bool didThrow = false;
try {
amount = Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: -1);
} catch (_) {
didThrow = true;
}
expect(didThrow, true);
});
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group("serialization", () {
test("toMap", () {
expect(
Amount(rawValue: BigInt.two, fractionDigits: 8).toMap(),
{"raw": "2", "fractionDigits": 8},
);
expect(
Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: 8).toMap(),
{"raw": "200000000", "fractionDigits": 8},
);
});
test("toJsonString", () {
expect(
Amount(rawValue: BigInt.two, fractionDigits: 8).toJsonString(),
'{"raw":"2","fractionDigits":8}',
);
expect(
Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: 8)
.toJsonString(),
'{"raw":"200000000","fractionDigits":8}',
);
});
test("localizedStringAsFixed", () {
expect(
Amount(rawValue: BigInt.two, fractionDigits: 8)
.localizedStringAsFixed(locale: "en_US"),
"0.00000002",
);
expect(
Amount(rawValue: BigInt.two, fractionDigits: 8)
.localizedStringAsFixed(locale: "en_US", decimalPlaces: 2),
"0.00",
);
expect(
Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: 8)
.localizedStringAsFixed(locale: "en_US"),
"2.00000000",
);
expect(
Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: 8)
.localizedStringAsFixed(locale: "en_US", decimalPlaces: 4),
"2.0000",
);
expect(
Amount.fromDecimal(Decimal.fromInt(2), fractionDigits: 8)
.localizedStringAsFixed(locale: "en_US", decimalPlaces: 0),
"2",
);
});
});
group("deserialization", () {
test("fromSerializedJsonString", () {
expect(
Amount.fromSerializedJsonString(
'{"raw":"200000000","fractionDigits":8}'),
Amount.fromDecimal(Decimal.parse("2"), fractionDigits: 8),
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);
});
});
group("operators", () {
final one = Amount(rawValue: BigInt.one, fractionDigits: 0);
final two = Amount(rawValue: BigInt.two, fractionDigits: 0);
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final four4 = Amount(rawValue: BigInt.from(4), fractionDigits: 4);
final four4_2 = Amount(rawValue: BigInt.from(4), fractionDigits: 4);
final four5 = Amount(rawValue: BigInt.from(4), fractionDigits: 5);
test(">", () {
expect(one > two, false);
expect(one > one, false);
expect(two > two, false);
expect(two > one, true);
});
test("<", () {
expect(one < two, true);
expect(one < one, false);
expect(two < two, false);
expect(two < one, false);
});
test(">=", () {
expect(one >= two, false);
expect(one >= one, true);
expect(two >= two, true);
expect(two >= one, true);
});
test("<=", () {
expect(one <= two, true);
expect(one <= one, true);
expect(two <= two, true);
expect(two <= one, false);
});
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test("<=", () {
expect(one <= two, true);
expect(one <= one, true);
expect(two <= two, true);
expect(two <= one, false);
});
test("==", () {
expect(one == two, false);
expect(one == one, true);
expect(BigInt.from(2) == BigInt.from(2), true);
expect(four4 == four4_2, true);
expect(four4 == four5, false);
});
test("+", () {
expect(one + two, Amount(rawValue: BigInt.from(3), fractionDigits: 0));
expect(one + one, Amount(rawValue: BigInt.from(2), fractionDigits: 0));
expect(
Amount(rawValue: BigInt.from(3), fractionDigits: 0) +
Amount(rawValue: BigInt.from(-5), fractionDigits: 0),
Amount(rawValue: BigInt.from(-2), fractionDigits: 0));
expect(
Amount(rawValue: BigInt.from(-3), fractionDigits: 0) +
Amount(rawValue: BigInt.from(6), fractionDigits: 0),
Amount(rawValue: BigInt.from(3), fractionDigits: 0));
});
test("-", () {
expect(one - two, Amount(rawValue: BigInt.from(-1), fractionDigits: 0));
expect(one - one, Amount(rawValue: BigInt.from(0), fractionDigits: 0));
expect(
Amount(rawValue: BigInt.from(3), fractionDigits: 0) -
Amount(rawValue: BigInt.from(-5), fractionDigits: 0),
Amount(rawValue: BigInt.from(8), fractionDigits: 0));
expect(
Amount(rawValue: BigInt.from(-3), fractionDigits: 0) -
Amount(rawValue: BigInt.from(6), fractionDigits: 0),
Amount(rawValue: BigInt.from(-9), fractionDigits: 0));
});
test("*", () {
expect(one * two, Amount(rawValue: BigInt.from(2), fractionDigits: 0));
expect(one * one, Amount(rawValue: BigInt.from(1), fractionDigits: 0));
expect(
Amount(rawValue: BigInt.from(3), fractionDigits: 0) *
Amount(rawValue: BigInt.from(-5), fractionDigits: 0),
Amount(rawValue: BigInt.from(-15), fractionDigits: 0));
expect(
Amount(rawValue: BigInt.from(-3), fractionDigits: 0) *
Amount(rawValue: BigInt.from(-6), fractionDigits: 0),
Amount(rawValue: BigInt.from(18), fractionDigits: 0));
});
});
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}