dev-docs: Go package docs (#958)

* Remove unused package

* Add Go package docs to most packages

Signed-off-by: Daniel Weiße <dw@edgeless.systems>
Signed-off-by: Fabian Kammel <fk@edgeless.systems>
Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>
Co-authored-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>
Co-authored-by: Fabian Kammel <fk@edgeless.systems>

upgrade-agent/internal/server/server_test.go

@@ -0,0 +1,105 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package server
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/edgelesssys/constellation/v2/internal/versions/components"
+	"github.com/edgelesssys/constellation/v2/upgrade-agent/upgradeproto"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestVersionVerifier(t *testing.T) {
+	testCases := map[string]struct {
+		versionString string
+		wantErr       bool
+	}{
+		"valid version": {
+			versionString: "v1.1.1",
+		},
+		"v prefix missing": {
+			versionString: "1.1.1",
+			wantErr:       true,
+		},
+		"invalid space": {
+			versionString: "v 1.1.1",
+			wantErr:       true,
+		},
+		"invalid version": {
+			versionString: "v1.1.1a",
+			wantErr:       true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			require := require.New(t)
+			assert := assert.New(t)
+
+			err := verifyVersion(tc.versionString)
+			if tc.wantErr {
+				assert.Error(err)
+				return
+			}
+
+			require.NoError(err)
+		})
+	}
+}
+
+func TestPrepareUpdate(t *testing.T) {
+	validUpdateRequest := &upgradeproto.ExecuteUpdateRequest{
+		WantedKubernetesVersion: "v1.1.1",
+	}
+	testCases := map[string]struct {
+		installer     osInstaller
+		updateRequest *upgradeproto.ExecuteUpdateRequest
+		wantErr       bool
+	}{
+		"works": {
+			installer:     stubOsInstaller{},
+			updateRequest: validUpdateRequest,
+		},
+		"invalid version string": {
+			installer:     stubOsInstaller{},
+			updateRequest: &upgradeproto.ExecuteUpdateRequest{WantedKubernetesVersion: "1337"},
+			wantErr:       true,
+		},
+		"install error": {
+			installer:     stubOsInstaller{InstallErr: fmt.Errorf("install error")},
+			updateRequest: validUpdateRequest,
+			wantErr:       true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			require := require.New(t)
+			assert := assert.New(t)
+
+			err := prepareUpdate(context.Background(), tc.installer, tc.updateRequest)
+			if tc.wantErr {
+				assert.Error(err)
+				return
+			}
+
+			require.NoError(err)
+		})
+	}
+}
+
+type stubOsInstaller struct {
+	InstallErr error
+}
+
+func (s stubOsInstaller) Install(ctx context.Context, kubernetesComponent components.Component) error {
+	return s.InstallErr
+}