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Problem solving followup #33

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105 changes: 88 additions & 17 deletions UnitTestProject/LinqUnitTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -66,127 +66,198 @@ public void Test_WhatIsTheTotalNumberOfTransactions()
[Test]
public void Test_WhatIsTheTotalQuantityPurchased()
{
var result = ""; // TODO
var result = transactions.Sum(t => t.Quantity);

Assert.AreEqual(3001, result);
}

[Test]
public void Test_WhatIsTheTotalQuantityPurchasedIn2016()
{
var result = ""; // TODO
var result = transactions
.Where(t => t.Date.Year == 2016)
.Sum(t => t.Quantity);

Assert.AreEqual(1160, result);
}

[Test]
public void Test_WhatIsTheTotalQuantityPurchasedInThePast7Days()
{
var result = ""; // TODO
DateTime fromDate = DateTime.Now.AddDays(-7);

var result = transactions
.Where(t => t.Date >= fromDate)
.Sum(t => t.Quantity);

Assert.AreEqual(32, result);
}

[Test]
public void Test_HowManyTransactionsBoughtMoreThan1Quantity()
{
var result = ""; // TODO
var result = transactions
.Where(t => t.Quantity > 1)
.Count();

Assert.AreEqual(1001, result);
}

[Test]
public void Test_HowManyTransactionsOccuredOnSundays()
{
var result = ""; // TODO
var result = transactions
.Where(t => t.Date.DayOfWeek == DayOfWeek.Sunday)
.Count();

Assert.AreEqual(267, result);
}

[Test]
public void Test_WhatIsTheAverageQuantityPurchased()
{
var result = 0; // TODO
var result = transactions.Average(t => t.Quantity);

Assert.AreEqual(1.5005, result, 0.0001);
}

[Test]
public void Test_HowManyBagsOfChipsHaveBeenBought()
{
var result = ""; // TODO
var result = transactions
.Where(t => t.ProductName == "Chips")
.Sum(t => t.Quantity);

Assert.AreEqual(390, result);
}

[Test]
public void Test_HowManyBagsOfChipsHasJasonBought()
{
var result = ""; // TODO
var result = transactions
.Where(t => t.ProductName == "Chips")
.Where(t => t.UserName == "Jason")
.Sum(t => t.Quantity);

Assert.AreEqual(44, result);
}

[Test]
public void Test_HowManyBagsOfChipsDidJasonBuyIn2015()
{
var result = ""; // TODO
var result = transactions
.Where(t => t.ProductName == "Chips")
.Where(t => t.UserName == "Jason")
.Where(t => t.Date.Year == 2015)
.Sum(t => t.Quantity);

Assert.AreEqual(33, result);
}

[Test]
public void Test_HowManyBagsOfChipsDidJasonBuyInMay2016()
{
var result = ""; // TODO
const int MAY = 5;

var result = transactions
.Where(t => t.ProductName == "Chips")
.Where(t => t.UserName == "Jason")
.Where(t => t.Date.Year == 2016 && t.Date.Month == MAY)
.Sum(t => t.Quantity);

Assert.AreEqual(2, result);
}

[Test]
public void Test_WhatProductSellsTheMostBetween12And1PM()
{
var result = ""; // TODO
List<ItemByCount> productByCount = transactions
.Where(t => t.Date.Hour >= 12 && t.Date.Hour <= 13)
.Select(t => new ItemByCount(t.ProductName, transactions.Where(p => p.ProductName == t.ProductName).Sum(i => i.Quantity)))
.Distinct()
.ToList();

var result = productByCount
.Where(t => t.count == productByCount.Max(pc => pc.count))
.Select(t => t.item)
.First();

Assert.AreEqual("Candy", result);
}

[Test]
public void Test_WhatProductSellsTheLeast()
{
var result = ""; // TODO
List<ItemByCount> productByCount = transactions
.Select(t => new ItemByCount(t.ProductName, transactions.Where(p => p.ProductName == t.ProductName).Sum(i => i.Quantity)))
.Distinct()
.ToList();

var result = productByCount
.Where(t => t.count == productByCount.Min(pc => pc.count))
.Select(t => t.item)
.First();

Assert.AreEqual("Cookies", result);
}

[Test]
public void Test_WhoBoughtTheMostCandy()
{
var result = ""; // TODO
List<Transaction> candyTransactions = transactions.Where(t => t.ProductName == "Candy").ToList();

var userByQuantities = candyTransactions.GroupBy(t => t.UserName, t => t.Quantity);

List<ItemByCount> userByTotalQuantity = userByQuantities.Select(t => new ItemByCount(t.Key, t.Sum())).ToList();

var result = userByTotalQuantity
.Where(t => t.count == userByTotalQuantity.Max(q => q.count))
.Select(t => t.item)
.First();

Assert.AreEqual("David", result);
}

[Test]
public void Test_WhatIsTheTotalDollarValueOfAllTransactions()
{
var result = 0; // TODO
Dictionary<string, double> productPrices = products.ToDictionary(p => p.Name, p => p.Price);

// double result = transactions.Aggregate(0.0, (total, next) => total + next.Quantity * products.Where(p => p.Name == next.ProductName).Select(p => p.Price).First());
double result = transactions.Aggregate(0.0, (total, next) => total + next.Quantity * productPrices[next.ProductName]);

Assert.AreEqual(3168.45, result, 0.001);
}

private String getUserWhoSpentTheMostMoney()
{
Dictionary<string, double> productPrices = products.ToDictionary(p => p.Name, p => p.Price);
var usersByPrices = transactions.GroupBy(t => t.UserName, t => t.Quantity * productPrices[t.ProductName]);

Dictionary<string, double> usersByTotalPrice = usersByPrices.ToDictionary(t => t.Key, t => t.Sum());

List<KeyValuePair<string, double>> sorted = (from kv in usersByTotalPrice orderby kv.Value descending select kv).ToList();

return sorted[0].Key;
}

[Test]
public void Test_WhoSpentTheMostMoney()
{
var result = ""; // TODO
String result = getUserWhoSpentTheMostMoney();

Assert.AreEqual("Rod", result);
}

[Test]
public void Test_WhatIsThePasswordOfThePersonWhoSpentTheMostMoney()
{
var result = ""; // TODO
String user = getUserWhoSpentTheMostMoney();

String result = users
.Where(u => u.Name == user)
.Select(u => u.Password)
.First();

Assert.AreEqual("optx", result);
}
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48 changes: 48 additions & 0 deletions problem-solving-followup/ProductByCount.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,48 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace problem_solving_followup
{
public class ItemByCount : IEquatable<ItemByCount>
{
public string item;
public int count;

public ItemByCount(string i, int c)
{
item = i;
count = c;
}

public bool Equals(ItemByCount ic)
{
if (ic == null)
{
return false;
}

return ic.item.Equals(this.item) && ic.count == this.count;
}

public bool Equals(object o)
{
if (o == null)
{
return false;
}

return this.Equals((ItemByCount)o);
}

public override int GetHashCode()
{
int hashItem = item.GetHashCode();
int hashCount = count.GetHashCode();

return hashItem ^ hashCount;
}
}
}
1 change: 1 addition & 0 deletions problem-solving-followup/problem-solving-followup.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@
</ItemGroup>
<ItemGroup>
<Compile Include="Product.cs" />
<Compile Include="ProductByCount.cs" />
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="Transaction.cs" />
Expand Down