Try to set Docker endpoint correctly for TLS

.gitlab-ci.yml

@@ -18,6 +18,9 @@ test:
     PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/docker
   script: 
     - curl https://download.docker.com/linux/static/stable/x86_64/docker-20.10.4.tgz | tar -xzv -C /usr/local/
+    - mkdir /usr/local/share/ca-certificates/docker-ca
+    - cp "${DOCKER_CERT_PATH}/ca.pem" /usr/local/share/ca-certificates/docker-ca/
+    - update-ca-certificates --fresh
     - dotnet tool restore
     - dotnet nuke Test
 

tests/INetMock.Client.IntegrationTest/DockerEndpoint.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Globalization;
+using System.Runtime.InteropServices;
+
+namespace INetMock.Client.IntegrationTest
+{
+    internal static class DockerEndpoint
+    {
+        private const string DockerHostEnvName = "DOCKER_HOST";
+        private const string DockerTlsVerifyEnvName = "DOCKER_TLS_VERIFY";
+
+        internal static string DetermineFromEnv() => DetermineEndpoint(
+            Environment.GetEnvironmentVariable(DockerHostEnvName),
+            Environment.GetEnvironmentVariable(DockerTlsVerifyEnvName)
+        );
+
+        internal static string DetermineEndpoint(string? dockerHost, string? tlsVerify)
+        {
+            dockerHost ??= "";
+            var dockerTlsVerify = int.TryParse(tlsVerify, out var verify) && verify == 1;
+            var isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
+            return (dockerHost, dockerTlsVerify, isWindows) switch
+            {
+                ("", _, true) => "npipe://./pipe/docker_engine",
+                ("", _, false) => "unix:/var/run/docker.sock",
+                (_, false, _) => dockerHost,
+                (var h, true, _) when h.StartsWith("tcp") => h.Replace(
+                    "tcp",
+                    "https",
+                    true,
+                    CultureInfo.InvariantCulture),
+                _ => "",
+            };
+        }
+    }
+}

tests/INetMock.Client.IntegrationTest/DockerEndpointTests.cs

@@ -0,0 +1,22 @@
+using Xunit;
+
+namespace INetMock.Client.IntegrationTest
+{
+    public class DockerEndpointTests
+    {
+        [Theory]
+        [InlineData(null, null, "unix:/var/run/docker.sock")]
+        [InlineData("tcp://docker:2375", null, "tcp://docker:2375")]
+        [InlineData("tcp://docker:2375", "0", "tcp://docker:2375")]
+        [InlineData("http://docker:2375", null, "http://docker:2375")]
+        [InlineData("http://docker:2375", "0", "http://docker:2375")]
+        [InlineData("tcp://docker:2376", "1", "https://docker:2376")]
+        [InlineData("https://docker:2376", "0", "https://docker:2376")]
+        public void DetermineDockerEndpoint_Input_ExpectedOutput(string? dockerHost, string? tlsVerify, string expected)
+        {
+            var actual = DockerEndpoint.DetermineEndpoint(dockerHost, tlsVerify);
+
+            Assert.Equal(expected, actual);
+        }
+    }
+}

tests/INetMock.Client.IntegrationTest/INetMock.Client.IntegrationTest.csproj

@@ -4,6 +4,8 @@
         <TargetFramework>net5.0</TargetFramework>
 
         <IsPackable>false</IsPackable>
+
+        <Nullable>enable</Nullable>
     </PropertyGroup>
 
     <ItemGroup>

tests/INetMock.Client.IntegrationTest/INetMockServerFixture.cs

@@ -10,6 +10,7 @@ namespace INetMock.Client.IntegrationTest
 {
     public class INetMockServerFixture : IAsyncLifetime
     {
+
         private readonly TestcontainersContainer _inetmockContainer;
 
         public INetMockServerFixture()
@@ -19,7 +20,7 @@ namespace INetMock.Client.IntegrationTest
                 .WithCommand("serve")
                 .WithPortBinding(80, true)
                 .WithWaitStrategy(Wait.ForUnixContainer().UntilPortIsAvailable(80))
-                .WithDockerEndpoint(Environment.GetEnvironmentVariable("DOCKER_HOST") ?? "unix:///var/run/docker.sock")
+                .WithDockerEndpoint(DockerEndpoint.DetermineFromEnv())
                 .WithMount(Path.GetTempPath(), "/var/run/inetmock")
                 .WithCleanUp(true)
                 .Build();