chore: Test Configure call

Author: HofmeisterAn

tests/Testcontainers.Platform.Linux.Tests/ConnectionStringProviderTest.cs

@@ -4,11 +4,18 @@ public sealed class ConnectionStringProviderTests : IAsyncLifetime
 {
     private const string ExpectedConnectionString = "connection string";
 
-    private readonly IContainer _container = new ContainerBuilder()
-        .WithImage(CommonImages.Alpine)
-        .WithCommand(CommonCommands.SleepInfinity)
-        .WithConnectionStringProvider(new ConnectionStringProvider())
-        .Build();
+    private readonly ConnectionStringProvider _connectionStringProvider = new ConnectionStringProvider();
+
+    private readonly IContainer _container;
+
+    public ConnectionStringProviderTests()
+    {
+        _container = new ContainerBuilder()
+            .WithImage(CommonImages.Alpine)
+            .WithCommand(CommonCommands.SleepInfinity)
+            .WithConnectionStringProvider(_connectionStringProvider)
+            .Build();
+    }
 
     public async ValueTask InitializeAsync()
     {
@@ -25,16 +32,20 @@ await _container.DisposeAsync()
     [Fact]
     public void GetConnectionStringReturnsExpectedValue()
     {
+        Assert.True(_connectionStringProvider.IsConfigured, "Configure should have been called during container startup.");
         Assert.Equal(ExpectedConnectionString, _container.GetConnectionString());
         Assert.Equal(ExpectedConnectionString, _container.GetConnectionString("name"));
     }
 
     private sealed class ConnectionStringProvider : IConnectionStringProvider<IContainer, IContainerConfiguration>
     {
+        public bool IsConfigured { get; private set; }
+
         public void Configure(IContainer container, IContainerConfiguration configuration)
         {
             Assert.NotNull(container);
             Assert.NotNull(configuration);
+            IsConfigured = true;
         }
 
         public string GetConnectionString(ConnectionMode connectionMode = ConnectionMode.Host)