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DUONG Phu-Hiep duongphuhiep

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  • lemonway.fr
  • Paris, France
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@duongphuhiep
duongphuhiep / Sociable Unit Test.md
Last active February 28, 2026 21:50
Solitary vs Sociable Unit Test

PART 1 - Solitary vs Sociable Unit Test (The "London School" vs. "Detroit School")

Term Scope Mocks
Unit Test (Solitary) One method / one class All direct dependencies.
Unit Test (Sociable) One feature / multiple classes Only external systems (DB/API).
Integration Test System + external No mocks (or very few).

Example: we want to unit test the PaymentService class.

  • The PaymentService depends on the WalletService, which is an internal class.
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duongphuhiep / 2 "tech" which might help C# dev @Lemonway.md
Last active February 10, 2026 22:09
2 "tech" which might help C# dev @lemonway
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duongphuhiep / CSharp Best Practices.md
Last active February 17, 2026 10:43
My personal experiences collected on Codes Review

0. Treat warning as error

in your .csproj

<TreatWarningsAsErrors>true</TreatWarningsAsErrors>

Do it each time you create new project before it is too late.

1. try/catch the right way

a) Don’t try/catch whenever you feel like it

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duongphuhiep / radzen-material.css
Created July 18, 2025 23:24
Radzen's Material theme complementary: supporting dark, light variant, react to prefers-color-scheme and data-theme attributes
/* Default value */
:root {
color-scheme: light;
--rz-alert-message-margin: 0.125rem 0;
--rz-alert-icon-margin: 0.125rem 0;
--rz-base: #eeeeee;
--rz-base-50: #fafafa;
--rz-base-100: #f5f5f5;
--rz-base-200: #eeeeee;
--rz-base-300: #e0e0e0;
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duongphuhiep / Registered Services in a blank .NET 9 Web API application.htm
Last active October 22, 2024 08:15
Registered Services in a blank .NET 9 Web API application
<html><head><meta http-equiv="Content-Type" content="text/html; charset=windows-1252"></head><body><h1>Registered Services in a blank .NET 9 Web API application</h1><table border="1"><thead><tr><th>Counter</th><th>Abstraction Type</th><th>Lifetime</th><th>Concrete Implementation</th></tr></thead><tbody><tr><td>1</td><td>Microsoft.Extensions.Hosting.IHostingEnvironment</td><td>Singleton</td><td>Microsoft.Extensions.Hosting.Internal.HostingEnvironment</td></tr><tr><td>2</td><td>Microsoft.Extensions.Hosting.IHostEnvironment</td><td>Singleton</td><td>Microsoft.Extensions.Hosting.Internal.HostingEnvironment</td></tr><tr><td>3</td><td>Microsoft.Extensions.Hosting.HostBuilderContext</td><td>Singleton</td><td>Microsoft.Extensions.Hosting.HostBuilderContext</td></tr><tr><td>4</td><td>Microsoft.Extensions.Configuration.IConfiguration</td><td>Singleton</td><td>System.Func`2[[System.IServiceProvider, System.ComponentModel, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a],[Microsoft.Extensions.Configurat
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duongphuhiep / C# Codes Review.md
Last active September 22, 2025 14:39
How to Review PRs / MRs of unfamiliar C# codes base?

How to Review PRs (or MRs) of unfamiliar C# codes base?

If you have to review a Pull Request (or Merge Request) in an unfamiliar C# codebase, what should you check? Here is my checklist for reviewing a C# codebase without fully knowing what it does:

Since we don’t know much about what the code is doing, the review should focus on best practices:

  • Are there tests that cover all the changes? If not, is there a justified reason why the changes are not unit-testable? (Yes, that can happen.)
  • Challenge any unjustified try/catch blocks.
  • Challenge the use of Generics or Reflection (often a sign of over-engineering).
  • Challenge the use of Inheritance (may indicate poor design or over-engineering).
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duongphuhiep / Logging best practices.md
Last active August 14, 2024 11:23
Logging best practices

Logging best practices

When generate a log message

  • Major branching points in your code
  • When errors or unexpected values are encountered
  • Any IO operations: calling database / stored proc or make http request
  • Significant domain events
  • Request failures and retries
  • Beginning and end of time-consuming operations
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duongphuhiep / AesEncryptionHelper.cs
Created July 10, 2023 14:37
AesEncryptionHelper
using System.Security.Cryptography;
using System.Text;
namespace Lemonway.TransactionService.Application
{
public static class AesEncryptionHelper
{
public static string Encrypt(string payload, string secret)
{
byte[] iv = new byte[16];
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duongphuhiep / keybindings.json
Last active May 10, 2023 07:07
vscode Hiep's keymap
// Place your key bindings in this file to override the defaultsauto[]
[
{
"key": "ctrl+t",
"command": "workbench.action.togglePanel"
},
{
"key": "ctrl+shift+f4",
"command": "workbench.action.closeOtherEditors"
},
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duongphuhiep / How to perform Request Reply communication between Iframe & Host.md
Last active December 25, 2024 21:07
How to perform Request Reply communication between Iframe & Host

Problem

Your HTML page (the host page) has an Iframe. The Iframe source is on other domain, so you will have to use the window.postMessage() for cross-origin communication. But this communication is only in 1 direction (The Iframe can inform the Host or the Host can inform the Iframe)

This article shows you how to make the Request/Reply communication using postMessage() and MessageChannel combination.

The article did not show you how to add a timeout to the communication, so the Iframe might wait forever if the Host did not response.

I will resume the technique by some codes snippets and at the same time add the missing timeout implementation.