Plugins: Add simple plugin sources service (#63814)

add simple plugin sources svc

pkg/plugins/manager/sources/sources_test.go

@@ -0,0 +1,41 @@
+package sources
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/grafana/grafana/pkg/plugins"
+	"github.com/grafana/grafana/pkg/plugins/config"
+	"github.com/grafana/grafana/pkg/setting"
+)
+
+func TestSources_List(t *testing.T) {
+	t.Run("Plugin sources are added in order", func(t *testing.T) {
+		cfg := &setting.Cfg{
+			BundledPluginsPath: "path1",
+		}
+		pCfg := &config.Cfg{
+			PluginsPath: "path2",
+			PluginSettings: setting.PluginSettings{
+				"foo": map[string]string{
+					"path": "path3",
+				},
+				"bar": map[string]string{
+					"url": "https://grafana.plugin",
+				},
+			},
+		}
+
+		s := ProvideService(cfg, pCfg)
+		srcs := s.List(context.Background())
+
+		expected := []plugins.PluginSource{
+			{Class: plugins.Core, Paths: []string{"app/plugins/datasource", "app/plugins/panel"}},
+			{Class: plugins.Bundled, Paths: []string{"path1"}},
+			{Class: plugins.External, Paths: []string{"path2", "path3"}},
+		}
+		require.Equal(t, expected, srcs)
+	})
+}