A C# solution to the Sales Tax Problem

Overview

The project is written in C# 7.0 and it was created in a Windows 10 operating system using Visual Studio 2017 RC. The solution provided conisists in three projects:

1. Salestax: a simple Console App (.NET Core) that prints out results after processing hardcoded input
2. Salestax.Core: a Class Library (.NET Standard) with the core logic
3. Salestax.Tests: a xUnit Test Project (.NET Core) that verifies the accuracy of core project logics

The Console App is able to parse input strings (using a Regex) in the following format:

<quantity> imported? <description> at <price>

• <quantity> must be an integer
• "imported" is an optional string
• <description> is the description of the product
• <price> must be a decimal

The result is the receipt with computed amount of each product followed by the sales taxes and the total amount:

1 book: 12.49
1 music CD: 16.49
1 chocolate bar: 0.85
Sales Taxes: 1.50
Total: 29.83

Dev box Setup

In order to compile and run the project you need:

• the Microsoft .NET Core SDK:
  • you have to download the 1.0.0-preview4-004175 .NET Core SDK Installer from the .NET Core command-line (CLI) tools site (use ".NET Core SDK Installer" column)
• the Microsoft .NET Core 1.1 runtime:
  • you have to download the Current release from the .NET Core Site
  • please ensure to select "Current" and "Runtime" buttons

If you want an IDE to modify and run the code you have to use Visual Studio 2017 RC:

• you have to download the Community edition of Visual Studio
  • please ensure you check the .NET Core and Docker Preview when you install the product

1) Compile the code

Clean & Build from Visual Studio

• open Visual Studio
• from the top menu click on File -> Open -> Project/solution
• select the SalesTax.sln file
• from the top menu click on Build -> Rebuild Solution (or simply use the keyboard shortcut F6)

Clean & Build from Command Prompt

If you love the "Command Prompt" you can compile the entire solution from command line:

• open a command prompt in solution folder (where the SalesTax.sln file is located)
• "dotnet restore"
• "dotnet build"

2) Run the code

Run from Visual Studio

• from the top menu click on Debug -> Start Debugging (or simply use the keyboard shortcut F5)

Run from Command Prompt

• open a command prompt in SalesTax project folder (where Program.cs file is located)
• "dotnet run"

3) Test the code

Every test inside the project SalesTax.Tests has comments to describe what's going on.

• // Arrange -> setup test environment (input, variables, ...)
• // Act -> execute the operation you want to test
• // Assert -> do all the checks to establish the test result.

Test from Visual Studio

• from the top menu click on Test -> Windows -> Test Explorer
• run all tests from the Test Explorer Tab

Test from Command Prompt

• open a command prompt in SalesTax.Tests project folder (where all test classes are located)
• "dotnet test"