test(unit): add coverage of printing in limited height

Signed-off-by: Billy Zha <[email protected]>

cmd/oras/internal/display/status/progress/manager_test.go

@@ -0,0 +1,48 @@
+/*
+Copyright The ORAS Authors.
+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
+
+http://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 progress
+
+import (
+	"fmt"
+	"testing"
+
+	"oras.land/oras/cmd/oras/internal/display/status/console"
+	"oras.land/oras/cmd/oras/internal/display/status/console/testutils"
+)
+
+func Test_manager_render(t *testing.T) {
+	pty, device, err := testutils.NewPty()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer device.Close()
+	m := &manager{
+		console: &console.Console{Console: pty},
+	}
+	_, height := m.console.Size()
+	for i := 0; i < height; i++ {
+		m.Add()
+	}
+	m.render()
+	// validate
+	var want []string
+	for i := height; i > 0; i -= 2 {
+		want = append(want, fmt.Sprintf("%dF%s", i, zeroStatus))
+	}
+	if err = testutils.MatchPty(pty, device, want...); err != nil {
+		t.Fatal(err)
+	}
+}