diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a1f3e34..5be0fc9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,20 +30,20 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/setup-go@v4
+      - uses: actions/setup-go@v5
         with:
           go-version: ${{ env.GO_VERSION }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: go mod download
       - run: go build -v .
 
   generate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v4
+      - uses: actions/setup-go@v5
         with:
           go-version: ${{ env.GO_VERSION }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: go generate ./...
       - name: git diff
         run: |
@@ -65,15 +65,16 @@ jobs:
           # - "1.1.*"
           # - "1.3.*"
           - "1.4.*"
+          - "1.6.*"
     steps:
-      - uses: actions/setup-go@v4
+      - uses: actions/setup-go@v5
         with:
           go-version: ${{ env.GO_VERSION }}
-      - uses: hashicorp/setup-terraform@v2
+      - uses: hashicorp/setup-terraform@v3
         with:
           terraform_version: ${{ matrix.terraform }}
           terraform_wrapper: false
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: go mod download
 
       - env:
diff --git a/internal/cmlschema/extconn_test.go b/internal/cmlschema/extconn_test.go
new file mode 100644
index 0000000..c45b958
--- /dev/null
+++ b/internal/cmlschema/extconn_test.go
@@ -0,0 +1,61 @@
+package cmlschema_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/diag"
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/tfsdk"
+	"github.com/hashicorp/terraform-plugin-framework/types"
+	cmlclient "github.com/rschmied/gocmlclient"
+	"github.com/rschmied/terraform-provider-cml2/internal/cmlschema"
+	"github.com/stretchr/testify/assert"
+)
+
+var conn1 *cmlclient.ExtConn = &cmlclient.ExtConn{
+	Label:        "NAT",
+	DeviceName: "virbr0",
+	Protected: false,
+	Snooped: true,
+	Tags: []string{
+		"NAT",
+	},
+	ID: "58568fbb-e1f8-4b83-a1f8-148c656eed39",
+}
+
+var conn2 *cmlclient.ExtConn = &cmlclient.ExtConn{
+	Label:        "System Bridge",
+	DeviceName: "bridge0",
+	Protected: true,
+	Snooped: true,
+	Tags: []string{
+		"System Bridge",
+	},
+	ID: "92f95da2-10fd-4a25-931e-acb31a47962c",
+}
+
+func TestConnector(t *testing.T) {
+	diag := &diag.Diagnostics{}
+	ctx := context.Background()
+
+	for _, connector := range []*cmlclient.ExtConn{conn1, conn2} {
+		value := cmlschema.NewExtConn(ctx, connector, diag)
+		t.Logf("value: %+v", value)
+		t.Logf("errors: %+v", diag.Errors())
+		assert.False(t, diag.HasError())
+		var newExtConn cmlschema.ExtConnModel
+		diag.Append(tfsdk.ValueAs(ctx, value, &newExtConn)...)
+	}
+	assert.False(t, diag.HasError())
+}
+
+func TestExtConnSchema(t *testing.T) {
+	extconnSchema := schema.Schema{
+		Attributes: cmlschema.Converter(cmlschema.ExtConn()),
+	}
+	got, diag := extconnSchema.TypeAtPath(context.TODO(), path.Root("id"))
+	assert.False(t, diag.HasError())
+	assert.Equal(t, types.StringType, got)
+}