test(sidekick): missing tests for config package (#1595)

Author: coryan

internal/sidekick/internal/config/source_roots_test.go

@@ -0,0 +1,75 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+)
+
+func TestSourceRoots(t *testing.T) {
+	type TestCase struct {
+		input map[string]string
+		want  []string
+	}
+	testCases := []TestCase{
+		{map[string]string{}, nil},
+		{map[string]string{
+			"googleapis-root": "foo",
+			"other-root":      "bar",
+			"ignored":         "baz",
+		}, []string{"googleapis-root", "other-root"}},
+		{map[string]string{
+			"roots":           "googleapis,more",
+			"googleapis-root": "foo",
+			"other-root":      "bar",
+			"more-root":       "bar",
+			"ignored":         "baz",
+		}, []string{"googleapis-root", "more-root"}},
+	}
+
+	for _, c := range testCases {
+		got := SourceRoots(c.input)
+		less := func(a, b string) bool { return a < b }
+		if diff := cmp.Diff(c.want, got, cmpopts.SortSlices(less)); diff != "" {
+			t.Errorf("AllSourceRoots mismatch (-want, +got):\n%s", diff)
+		}
+	}
+}
+
+func TestAllSourceRoots(t *testing.T) {
+	type TestCase struct {
+		input map[string]string
+		want  []string
+	}
+	testCases := []TestCase{
+		{map[string]string{}, nil},
+		{map[string]string{
+			"googleapis-root": "foo",
+			"other-root":      "bar",
+			"ignored":         "baz",
+		}, []string{"googleapis-root", "other-root"}},
+	}
+
+	for _, c := range testCases {
+		got := AllSourceRoots(c.input)
+		less := func(a, b string) bool { return a < b }
+		if diff := cmp.Diff(c.want, got, cmpopts.SortSlices(less)); diff != "" {
+			t.Errorf("AllSourceRoots mismatch (-want, +got):\n%s", diff)
+		}
+	}
+}