test: wait for internal port also to be available (GoogleCloudPlatform#4062)

Author: olavloite

samples/dotnet/npgsql-sample/Program.cs

@@ -52,6 +52,7 @@ private static async Task<IContainer> StartPGAdapterAndEmulator()
             .WithPortBinding(5432, true)
             // Wait until the PostgreSQL port is available.
             .WithWaitStrategy(Wait.ForUnixContainer().UntilExternalTcpPortIsAvailable(5432))
+            .WithWaitStrategy(Wait.ForUnixContainer().UntilInternalTcpPortIsAvailable(5432))
             // Build the container configuration.
             .Build();
         await container.StartAsync();

samples/snippets/dotnet-snippets/sample-tests/SampleTests.cs

@@ -234,6 +234,7 @@ private static async Task<IContainer> StartPGAdapterAndEmulator()
             .WithPortBinding(5432, true)
             // Wait until the PostgreSQL port is available.
             .WithWaitStrategy(Wait.ForUnixContainer().UntilExternalTcpPortIsAvailable(5432))
+            .WithWaitStrategy(Wait.ForUnixContainer().UntilInternalTcpPortIsAvailable(5432))
             // Build the container configuration.
             .Build();
         await container.StartAsync();