feat: auto generated files and new structure (#4)

## Description

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In case there is no issue present for your PR, please consider creating one.
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: #4
Reviewed-by: Andre_Harms <andre.harms@stackit.cloud>
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

stackit/internal/services/sqlserverflexalpha/flavor/functions_test.go

@@ -0,0 +1,134 @@
+package sqlserverFlexAlphaFlavor
+
+import (
+	"context"
+	"testing"
+
+	"github.com/mhenselin/terraform-provider-stackitprivatepreview/pkg/sqlserverflexalpha"
+	"github.com/stackitcloud/stackit-sdk-go/core/utils"
+)
+
+type mockRequest struct {
+	executeFunc func() (*sqlserverflexalpha.GetFlavorsResponse, error)
+}
+
+func (m *mockRequest) Page(_ int64) sqlserverflexalpha.ApiGetFlavorsRequestRequest { return m }
+func (m *mockRequest) Size(_ int64) sqlserverflexalpha.ApiGetFlavorsRequestRequest { return m }
+func (m *mockRequest) Sort(_ sqlserverflexalpha.FlavorSort) sqlserverflexalpha.ApiGetFlavorsRequestRequest {
+	return m
+}
+func (m *mockRequest) Execute() (*sqlserverflexalpha.GetFlavorsResponse, error) {
+	return m.executeFunc()
+}
+
+type mockFlavorsClient struct {
+	executeRequest func() sqlserverflexalpha.ApiGetFlavorsRequestRequest
+}
+
+func (m *mockFlavorsClient) GetFlavorsRequest(_ context.Context, _, _ string) sqlserverflexalpha.ApiGetFlavorsRequestRequest {
+	return m.executeRequest()
+}
+
+var mockResp = func(page int64) (*sqlserverflexalpha.GetFlavorsResponse, error) {
+	if page == 1 {
+		return &sqlserverflexalpha.GetFlavorsResponse{
+			Flavors: &[]sqlserverflexalpha.ListFlavors{
+				{Id: utils.Ptr("flavor-1"), Description: utils.Ptr("first")},
+				{Id: utils.Ptr("flavor-2"), Description: utils.Ptr("second")},
+			},
+		}, nil
+	}
+	if page == 2 {
+		return &sqlserverflexalpha.GetFlavorsResponse{
+			Flavors: &[]sqlserverflexalpha.ListFlavors{
+				{Id: utils.Ptr("flavor-3"), Description: utils.Ptr("three")},
+			},
+		}, nil
+	}
+
+	return &sqlserverflexalpha.GetFlavorsResponse{
+		Flavors: &[]sqlserverflexalpha.ListFlavors{},
+	}, nil
+}
+
+func TestGetFlavorsByFilter(t *testing.T) {
+	tests := []struct {
+		description string
+		projectId   string
+		region      string
+		mockErr     error
+		filter      func(sqlserverflexalpha.ListFlavors) bool
+		wantCount   int
+		wantErr     bool
+	}{
+		{
+			description: "Success - Get all flavors (2 pages)",
+			projectId:   "pid", region: "reg",
+			filter:    func(_ sqlserverflexalpha.ListFlavors) bool { return true },
+			wantCount: 3,
+			wantErr:   false,
+		},
+		{
+			description: "Success - Filter flavors by description",
+			projectId:   "pid", region: "reg",
+			filter:    func(f sqlserverflexalpha.ListFlavors) bool { return *f.Description == "first" },
+			wantCount: 1,
+			wantErr:   false,
+		},
+		{
+			description: "Error - Missing parameters",
+			projectId:   "", region: "reg",
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(
+			tt.description, func(t *testing.T) {
+				var currentPage int64
+				client := &mockFlavorsClient{
+					executeRequest: func() sqlserverflexalpha.ApiGetFlavorsRequestRequest {
+						return &mockRequest{
+							executeFunc: func() (*sqlserverflexalpha.GetFlavorsResponse, error) {
+								currentPage++
+								return mockResp(currentPage)
+							},
+						}
+					},
+				}
+				actual, err := getFlavorsByFilter(context.Background(), client, tt.projectId, tt.region, tt.filter)
+
+				if (err != nil) != tt.wantErr {
+					t.Errorf("getFlavorsByFilter() error = %v, wantErr %v", err, tt.wantErr)
+					return
+				}
+
+				if !tt.wantErr && len(actual) != tt.wantCount {
+					t.Errorf("getFlavorsByFilter() got %d flavors, want %d", len(actual), tt.wantCount)
+				}
+			},
+		)
+	}
+}
+
+func TestGetAllFlavors(t *testing.T) {
+	var currentPage int64
+	client := &mockFlavorsClient{
+		executeRequest: func() sqlserverflexalpha.ApiGetFlavorsRequestRequest {
+			return &mockRequest{
+				executeFunc: func() (*sqlserverflexalpha.GetFlavorsResponse, error) {
+					currentPage++
+					return mockResp(currentPage)
+				},
+			}
+		},
+	}
+
+	res, err := getAllFlavors(context.Background(), client, "pid", "reg")
+	if err != nil {
+		t.Errorf("getAllFlavors() unexpected error: %v", err)
+	}
+	if len(res) != 3 {
+		t.Errorf("getAllFlavors() expected 3 flavor, got %d", len(res))
+	}
+}