public void AddDebitCreditBalancesSecondLargerTest()
{
Balance b1 = new Balance(50M, BalanceType.Debit);
Balance b2 = new Balance(100M, BalanceType.Credit);
Balance b3 = b1 + b2;
Assert.AreEqual(b3.Magnitude, 50M);
Assert.AreEqual(b3.BalanceType, BalanceType.Credit);
}
public void AddTwoDebitBalancesTest()
{
Balance b1 = new Balance(100M, BalanceType.Debit);
Balance b2 = new Balance(50M, BalanceType.Debit);
Balance b3 = b1 + b2;
Assert.AreEqual(b3.Magnitude, 150M);
Assert.AreEqual(b3.BalanceType, BalanceType.Debit);
}
public void EqualsFalseTest()
{
Balance b1 = new Balance(100M, BalanceType.Debit);
Balance b2 = new Balance(100M, BalanceType.Credit);
bool result = b1 == b2;
Assert.IsFalse(result);
Balance b3 = new Balance(100M, BalanceType.Credit);
Balance b4 = new Balance(50M, BalanceType.Credit);
result = b3 == b4;
Assert.IsFalse(result);
}
public void EqualsMethodTest()
{
Balance b1 = new Balance(100M, BalanceType.Debit);
Balance b2 = new Balance(100M, BalanceType.Debit);
bool result = b1.Equals(b2);
Assert.IsTrue(result);
}
public void SubtractTwoCreditBalancesTest()
{
Balance b1 = new Balance(100M, BalanceType.Credit);
Balance b2 = new Balance(50M, BalanceType.Credit);
Balance b3 = b1 - b2;
Assert.AreEqual(b3.Magnitude, 50M);
Assert.AreEqual(b3.BalanceType, BalanceType.Credit);
}
public void NotEqualsTrueTest()
{
Balance b1 = new Balance(100M, BalanceType.Debit);
Balance b2 = new Balance(100M, BalanceType.Credit);
bool result = b1 != b2;
Assert.IsTrue(result);
Balance b3 = new Balance(100M, BalanceType.Credit);
Balance b4 = new Balance(50M, BalanceType.Credit);
result = b3 != b4;
Assert.IsTrue(result);
}
/// <summary>
/// Adds two balances.
/// </summary>
/// <param name="lhs">The left-hand side.</param>
/// <param name="rhs">The right-hand side.</param>
/// <returns>A resulting balance.</returns>
public static Balance operator +(Balance lhs, Balance rhs)
{
Balance result = new Balance();
if (lhs.BalanceType == rhs.BalanceType) {
result.Magnitude = lhs.Magnitude + rhs.Magnitude;
result.BalanceType = lhs.BalanceType;
}
else {
if (lhs.Magnitude >= rhs.Magnitude) {
result.Magnitude = lhs.Magnitude - rhs.Magnitude;
result.BalanceType = lhs.BalanceType;
}
else {
result.Magnitude = rhs.Magnitude - lhs.Magnitude;
result.BalanceType = rhs.BalanceType;
}
}
return result;
}
/// <summary>
/// Attempts to parse a Balance given a string and the type of balance expected.
/// </summary>
/// <param name="balanceText">The text to attempt to parse.</param>
/// <param name="expectedBalanceType">The type of balance expected. If null, 'CR' or 'DR' must be specified in the balance text.</param>
/// <param name="resultBalance">If parsing is sucessful, this will contain the parsed balance.</param>
/// <returns>True if the text could be parsed, otherwise false.</returns>
public static bool TryParse(string balanceText, BalanceType? expectedBalanceType, out Balance resultBalance)
{
bool result = true;
decimal magnitude = 0M;
BalanceType type = BalanceType.Credit;
balanceText = (balanceText ?? string.Empty).Trim().ToUpper();
// What type of balance is it?
if (balanceText.EndsWith("CR")) {
type = BalanceType.Credit;
balanceText = balanceText.Substring(0, balanceText.Length - 2);
} else if (balanceText.EndsWith("DR")) {
type = BalanceType.Debit;
balanceText = balanceText.Substring(0, balanceText.Length - 2);
} else {
if (expectedBalanceType != null && expectedBalanceType.HasValue) {
type = expectedBalanceType.Value;
} else {
result = false;
}
}
// Get the value (magnitude) of the balance
if (result == true) {
result = decimal.TryParse(balanceText.Trim(), NumberStyles.Any, CultureInfo.CurrentCulture, out magnitude);
magnitude = Math.Abs(magnitude);
}
resultBalance = new Balance(magnitude, type);
return result;
}
/// <summary>
/// Attempts to parse a Balance given a string.
/// </summary>
/// <param name="balanceText">The text to attempt to parse.</param>
/// <param name="resultBalance">If parsing is sucessful, this will contain the parsed balance.</param>
/// <returns>True if the text could be parsed, otherwise false.</returns>
public static bool TryParse(string balanceText, out Balance resultBalance)
{
return TryParse(balanceText, null, out resultBalance);
}