api: refactor attestationconfigapi client/fetcher

There is now one SEVSNPVersions type that has a variant
property. That property is used to build the correct JSON
path. The surrounding methods handling the version objects
are also updated to receive a variant argument and work
for multiple variants. This simplifies adding AWS support.

internal/api/attestationconfigapi/snp_test.go

@@ -0,0 +1,77 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package attestationconfigapi
+
+import (
+	"testing"
+
+	"github.com/edgelesssys/constellation/v2/internal/attestation/variant"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSEVSNPVersionListMarshalUnmarshalJSON(t *testing.T) {
+	tests := map[string]struct {
+		input    SEVSNPVersionList
+		output   SEVSNPVersionList
+		wantDiff bool
+	}{
+		"success": {
+			input:  SEVSNPVersionList{list: []string{"v1", "v2"}},
+			output: SEVSNPVersionList{list: []string{"v1", "v2"}},
+		},
+		"variant is lost": {
+			input:  SEVSNPVersionList{list: []string{"v1", "v2"}, variant: variant.AzureSEVSNP{}},
+			output: SEVSNPVersionList{list: []string{"v1", "v2"}},
+		},
+		"wrong order": {
+			input:    SEVSNPVersionList{list: []string{"v1", "v2"}},
+			output:   SEVSNPVersionList{list: []string{"v2", "v1"}},
+			wantDiff: true,
+		},
+	}
+
+	for name, tc := range tests {
+		t.Run(name, func(t *testing.T) {
+			inputRaw, err := tc.input.MarshalJSON()
+			require.NoError(t, err)
+
+			var actual SEVSNPVersionList
+			err = actual.UnmarshalJSON(inputRaw)
+			require.NoError(t, err)
+
+			if tc.wantDiff {
+				assert.NotEqual(t, tc.output, actual, "Objects are equal, expected unequal")
+			} else {
+				assert.Equal(t, tc.output, actual, "Objects are not equal, expected equal")
+			}
+		})
+	}
+}
+
+func TestSEVSNPVersionListAddVersion(t *testing.T) {
+	tests := map[string]struct {
+		versions []string
+		new      string
+		expected []string
+	}{
+		"success": {
+			versions: []string{"v1", "v2"},
+			new:      "v3",
+			expected: []string{"v3", "v2", "v1"},
+		},
+	}
+
+	for name, tc := range tests {
+		t.Run(name, func(t *testing.T) {
+			v := SEVSNPVersionList{list: tc.versions}
+			v.addVersion(tc.new)
+
+			assert.Equal(t, tc.expected, v.list)
+		})
+	}
+}