From 70e20052fe62ce8bcd8706ee75d84b473e60ef84 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20D=C3=B6rnen?= <mail@christiandoernen.de>
Date: Mon, 15 Dec 2025 14:37:46 +0100
Subject: [PATCH 1/2] Defer adding user secrets and building configuration root
 unit constructors of base classes did run.

---
 src/Abstracts/TestBedFixture.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Abstracts/TestBedFixture.cs b/src/Abstracts/TestBedFixture.cs
index b1b46a2..22f64d9 100644
--- a/src/Abstracts/TestBedFixture.cs
+++ b/src/Abstracts/TestBedFixture.cs
@@ -23,8 +23,6 @@ protected TestBedFixture()
 	{
 		_services = new ServiceCollection();
 		ConfigurationBuilder = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory());
-		AddUserSecrets(ConfigurationBuilder);
-		Configuration = GetConfigurationRoot();
 		_servicesAdded = false;
 	}
 
@@ -51,6 +49,8 @@ public ServiceProvider GetServiceProvider(ITestOutputHelper testOutputHelper)
 		}
 		if (!_servicesAdded)
 		{
+			AddUserSecrets(ConfigurationBuilder);
+			Configuration = GetConfigurationRoot();
 			AddServices(_services, Configuration);
 			_services.AddLogging(loggingBuilder => AddLoggingProvider(loggingBuilder, new OutputLoggerProvider(testOutputHelper)));
 			_services.AddOptions();

From 983c0dc8a595aa6effc4625eae03917407dc189b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20D=C3=B6rnen?= <mail@christiandoernen.de>
Date: Mon, 15 Dec 2025 17:40:43 +0100
Subject: [PATCH 2/2] Add test

---
 .../ConfigurationTests.cs                     | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 examples/Xunit.Microsoft.DependencyInjection.ExampleTests/ConfigurationTests.cs

diff --git a/examples/Xunit.Microsoft.DependencyInjection.ExampleTests/ConfigurationTests.cs b/examples/Xunit.Microsoft.DependencyInjection.ExampleTests/ConfigurationTests.cs
new file mode 100644
index 0000000..4a6de58
--- /dev/null
+++ b/examples/Xunit.Microsoft.DependencyInjection.ExampleTests/ConfigurationTests.cs
@@ -0,0 +1,22 @@
+namespace Xunit.Microsoft.DependencyInjection.ExampleTests;
+
+public class ConfigurationTests : TestBed<TestProjectFixture>
+{
+    private const string Key = "CONFIG_KEY";
+    private const string Value = "Value";
+    
+    public ConfigurationTests(ITestOutputHelper testOutputHelper, TestProjectFixture fixture) : base(testOutputHelper, fixture)
+    {
+        Environment.SetEnvironmentVariable(Key, Value);
+    }
+    
+    [Fact]
+    public void EnvironmentVariablesViaConstructorAreAvailable()
+    {
+        _fixture.GetServiceProvider(_testOutputHelper);
+
+        var value = _fixture.Configuration!.GetValue<string>(Key);
+
+        Assert.Equal(Value, value);
+    }
+}