Add test for PromQL braces when parsing lists of matchers

Signed-off-by: George Robinson <[email protected]>

cli/util_test.go

@@ -0,0 +1,14 @@
+package cli
+
+import (
+	"github.com/stretchr/testify/require"
+	"testing"
+)
+
+func TestParseMatchers(t *testing.T) {
+	// Should not be able to parse lists of matchers using PromQL syntax.
+	// If you want to do use, should put all matchers in a single string.
+	m, err := parseMatchers([]string{"{foo=bar}"})
+	require.EqualError(t, err, "bad matcher format: {foo=bar}")
+	require.Len(t, m, 0)
+}