haproxy_test: extend tests to cover name globbing

plugins/inputs/haproxy/haproxy_test.go

@@ -111,36 +111,52 @@ func TestHaproxyGeneratesMetricsWithoutAuthentication(t *testing.T) {
 
 func TestHaproxyGeneratesMetricsUsingSocket(t *testing.T) {
 	var randomNumber int64
+	var sockets [5]net.Listener
+	_globmask := "/tmp/test-haproxy*.sock"
+	_badmask := "/tmp/test-fail-haproxy*.sock"
+
+	for i := 0; i < 5; i++ {
 		binary.Read(rand.Reader, binary.LittleEndian, &randomNumber)
-	sock, err := net.Listen("unix", fmt.Sprintf("/tmp/test-haproxy%d.sock", randomNumber))
+		sockname := fmt.Sprintf("/tmp/test-haproxy%d.sock", randomNumber)
+
+		sock, err := net.Listen("unix", sockname)
 		if err != nil {
 			t.Fatal("Cannot initialize socket ")
 		}
 
+		sockets[i] = sock
 		defer sock.Close()
 
 		s := statServer{}
 		go s.serverSocket(sock)
+	}
 
 	r := &haproxy{
-		Servers: []string{sock.Addr().String()},
+		Servers: []string{_globmask},
 	}
 
 	var acc testutil.Accumulator
 
-	err = r.Gather(&acc)
+	err := r.Gather(&acc)
 	require.NoError(t, err)
 
+	fields := HaproxyGetFieldValues()
+
+	for _, sock := range sockets {
 		tags := map[string]string{
 			"proxy":  "be_app",
 			"server": sock.Addr().String(),
 			"sv":     "host0",
 		}
 
-	fields := HaproxyGetFieldValues()
-
 		acc.AssertContainsTaggedFields(t, "haproxy", fields, tags)
-	assert.Equal(t, len(socks), 5, "Failed to glob all sockets")
+	}
+
+	// This mask should not match any socket
+	r.Servers = []string{_badmask}
+
+	err = r.Gather(&acc)
+	require.Error(t, err)
 }
 
 //When not passing server config, we default to localhost