Add function to list datasources (#1287)

* Add function to list datasources

* Sort datasources in ascending order and return in listDatasources

* Fix lint error

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/data/datasource_test.go b/data/datasource_test.go
index 4cffc763..aadcef0e 100644
--- a/data/datasource_test.go
+++ b/data/datasource_test.go
@@ -412,3 +412,13 @@ func TestFromConfig(t *testing.T) {
 	}
 	assert.EqualValues(t, expected, FromConfig(ctx, cfg))
 }
+
+func TestListDatasources(t *testing.T) {
+	sources := map[string]*Source{
+		"foo": {Alias: "foo"},
+		"bar": {Alias: "bar"},
+	}
+	data := &Data{Sources: sources}
+
+	assert.Equal(t, []string{"bar", "foo"}, data.ListDatasources())
+}