chore: add sqlserveralpha tests (#49)

## Description

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At least please give us some description what you are trying to achieve and why your change is needed. -->

relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #49
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

cmd/cmd/build/templates/resource_scaffold.gotmpl

@@ -42,14 +42,16 @@ type {{.NameCamel}}Resource struct{
 type {{.NamePascal}}ResourceIdentityModel struct {
 	ProjectID  types.String `tfsdk:"project_id"`
 	Region     types.String `tfsdk:"region"`
-	{{.NamePascal}}ID types.String `tfsdk:"instance_id"`
 	// TODO: implement further needed parts
+	{{.NamePascal}}ID types.String `tfsdk:"instance_id"`
 }
 
+// Metadata defines terraform resource name
 func (r *{{.NameCamel}}Resource) Metadata(ctx context.Context, req resource.MetadataRequest, resp *resource.MetadataResponse) {
 	resp.TypeName = req.ProviderTypeName + "_{{.PackageName}}_{{.NameSnake}}"
 }
 
+// Schema loads the schema from generated files and adds plan modifiers
 func (r *{{.NameCamel}}Resource) Schema(ctx context.Context, req resource.SchemaRequest, resp *resource.SchemaResponse) {
 	schema = {{.PackageName}}ResGen.{{.NamePascal}}ResourceSchema(ctx)
 
@@ -67,6 +69,7 @@ func (r *{{.NameCamel}}Resource) Schema(ctx context.Context, req resource.Schema
     resp.Schema = schema
 }
 
+// IdentitySchema defines the identity schema
 func (r *instanceResource) IdentitySchema(_ context.Context, _ resource.IdentitySchemaRequest, resp *resource.IdentitySchemaResponse) {
 	resp.IdentitySchema = identityschema.Schema{
 		Attributes: map[string]identityschema.Attribute{
@@ -83,7 +86,6 @@ func (r *instanceResource) IdentitySchema(_ context.Context, _ resource.Identity
 	}
 }
 
-
 // Configure adds the provider configured client to the resource.
 func (r *{{.NameCamel}}Resource) Configure(
 	ctx context.Context,
@@ -152,18 +154,6 @@ func (r *{{.NameCamel}}Resource) ModifyPlan(
 		return
 	}
 
-	var identityModel {{.NamePascal}}ResourceIdentityModel
-	identityModel.ProjectID = planModel.ProjectId
-	identityModel.Region = planModel.Region
-	if !planModel.{{.NamePascal}}Id.IsNull() && !planModel.{{.NamePascal}}Id.IsUnknown() {
-		identityModel.{{.NamePascal}}ID = planModel.{{.NamePascal}}Id
-	}
-
-	resp.Diagnostics.Append(resp.Identity.Set(ctx, identityModel)...)
-	if resp.Diagnostics.HasError() {
-		return
-	}
-
 	resp.Diagnostics.Append(resp.Plan.Set(ctx, planModel)...)
 	if resp.Diagnostics.HasError() {
 		return
@@ -184,17 +174,10 @@ func (r *{{.NameCamel}}Resource) Create(ctx context.Context, req resource.Create
 		return
 	}
 
-	// Read identity data
-	var identityData {{.NamePascal}}ResourceIdentityModel
-	resp.Diagnostics.Append(req.Identity.Get(ctx, &identityData)...)
-	if resp.Diagnostics.HasError() {
-		return
-	}
-
 	ctx = core.InitProviderContext(ctx)
 
-	projectId := identityData.ProjectID.ValueString()
-	region := identityData.Region.ValueString()
+	projectId := data.ProjectId.ValueString()
+	region := data.Region.ValueString()
 	ctx = tflog.SetField(ctx, "project_id", projectId)
 	ctx = tflog.SetField(ctx, "region", region)
 
@@ -320,7 +303,7 @@ func (r *{{.NameCamel}}Resource) Read(ctx context.Context, req resource.ReadRequ
 	ctx = tflog.SetField(ctx, "project_id", projectId)
 	ctx = tflog.SetField(ctx, "region", region)
 
-	// Todo: Read API call logic
+	// TODO: Read API call logic
 
 	// Save updated data into Terraform state
 	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
@@ -348,22 +331,26 @@ func (r *{{.NameCamel}}Resource) Update(ctx context.Context, req resource.Update
 		return
 	}
 
-	// Read identity data
-	var identityData {{.NamePascal}}ResourceIdentityModel
-	resp.Diagnostics.Append(req.Identity.Get(ctx, &identityData)...)
-	if resp.Diagnostics.HasError() {
-		return
-	}
-
-
 	ctx = core.InitProviderContext(ctx)
 
-	projectId := identityData.ProjectID.ValueString()
-	region := identityData.Region.ValueString()
+	projectId := data.ProjectId.ValueString()
+	region := data.Region.ValueString()
 	ctx = tflog.SetField(ctx, "project_id", projectId)
 	ctx = tflog.SetField(ctx, "region", region)
 
-	// Todo: Update API call logic
+	// TODO: Update API call logic
+
+	// TODO: Set data returned by API in identity
+	identity := {{.NamePascal}}ResourceIdentityModel{
+		ProjectID:  types.StringValue(projectId),
+		Region:     types.StringValue(region),
+		// TODO: add missing values
+		{{.NamePascal}}ID: types.StringValue({{.NamePascal}}Id),
+	}
+	resp.Diagnostics.Append(resp.Identity.Set(ctx, identity)...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
 
 	// Save updated data into Terraform state
 	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
@@ -395,7 +382,7 @@ func (r *{{.NameCamel}}Resource) Delete(ctx context.Context, req resource.Delete
 	ctx = tflog.SetField(ctx, "project_id", projectId)
 	ctx = tflog.SetField(ctx, "region", region)
 
-	// Todo: Delete API call logic
+	// TODO: Delete API call logic
 
 	tflog.Info(ctx, "{{.PackageName}}.{{.NamePascal}} deleted")
 }
@@ -409,7 +396,8 @@ func (r *{{.NameCamel}}Resource) ImportState(
 ) {
 	idParts := strings.Split(req.ID, core.Separator)
 
-	// Todo: Import logic
+	// TODO: Import logic
+	// TODO: fix len and parts itself
 	if len(idParts) < 2 || idParts[0] == "" || idParts[1] == "" {
 		core.LogAndAddError(
 			ctx, &resp.Diagnostics,