chore: add test

internal/core/docker_host_test.go

@@ -2,12 +2,14 @@ package core
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"path/filepath"
 	"testing"
 
 	"github.com/docker/docker/api/types/system"
 	"github.com/docker/docker/client"
+	"github.com/docker/docker/errdefs"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
@@ -271,12 +273,17 @@ func TestExtractDockerHost(t *testing.T) {
 // different operating systems.
 type mockCli struct {
 	client.APIClient
-	OS string
+	OS           string
+	notReachable bool
 }
 
 // Info returns a mock implementation of types.Info, which is handy for detecting the operating system,
 // which is used to determine the default docker socket path.
 func (m mockCli) Info(ctx context.Context) (system.Info, error) {
+	if m.notReachable {
+		return system.Info{}, errdefs.Unavailable(fmt.Errorf("Docker is not reachable"))
+	}
+
 	return system.Info{
 		OperatingSystem: m.OS,
 	}, nil
@@ -411,6 +418,29 @@ func TestExtractDockerSocketFromClient(t *testing.T) {
 
 		assert.Equal(t, "/this/is/a/sample.sock", socket)
 	})
+
+	t.Run("Unix Docker Socket is not reachable, so Info panics", func(t *testing.T) {
+		defer func() {
+			if r := recover(); r == nil {
+				t.Errorf("The code did not panic")
+			}
+		}()
+
+		content := "docker.host=" + DockerSocketSchema + "/this/is/a/sample.sock"
+		setupTestcontainersProperties(t, content)
+		setupDockerSocketNotFound(t)
+
+		t.Cleanup(resetSocketOverrideFn)
+
+		ctx := context.Background()
+		os.Unsetenv("TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE")
+		os.Unsetenv("DOCKER_HOST")
+
+		// force a non
+		socket := extractDockerSocketFromClient(ctx, mockCli{notReachable: true})
+
+		assert.Equal(t, "/this/is/a/sample.sock", socket)
+	})
 }
 
 func TestInAContainer(t *testing.T) {