image/tree: Add test for checking ansi escape output

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

cli/command/image/tree_test.go

@@ -0,0 +1,132 @@
+package image
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/docker/cli/internal/test"
+	"gotest.tools/v3/assert"
+)
+
+func TestPrintImageTreeAnsiTty(t *testing.T) {
+	testCases := []struct {
+		name         string
+		stdinTty     bool
+		stdoutTty    bool
+		stderrTty    bool
+		expectedAnsi bool
+	}{
+		{
+			name:      "non-terminal",
+			stdinTty:  false,
+			stdoutTty: false,
+			stderrTty: false,
+
+			expectedAnsi: false,
+		},
+		{
+			name:      "terminal",
+			stdinTty:  true,
+			stdoutTty: true,
+			stderrTty: true,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdout-tty-only",
+			stdinTty:  false,
+			stdoutTty: true,
+			stderrTty: false,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdin-stderr-tty-only",
+			stdinTty:  true,
+			stdoutTty: false,
+			stderrTty: true,
+
+			expectedAnsi: false,
+		},
+		{
+			name:      "stdout-stdin-tty",
+			stdinTty:  true,
+			stdoutTty: true,
+			stderrTty: false,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdout-stderr-tty",
+			stdinTty:  false,
+			stdoutTty: true,
+			stderrTty: true,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdin-tty-only",
+			stdinTty:  true,
+			stdoutTty: false,
+			stderrTty: false,
+
+			expectedAnsi: false,
+		},
+		{
+			name:      "stderr-tty-only",
+			stdinTty:  false,
+			stdoutTty: false,
+			stderrTty: true,
+
+			expectedAnsi: false,
+		},
+	}
+
+	mockView := treeView{
+		images: []topImage{
+			{
+				Names: []string{"test-image:latest"},
+				Details: imageDetails{
+					ID:          "sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
+					DiskUsage:   "10.5 MB",
+					InUse:       true,
+					ContentSize: "5.2 MB",
+				},
+				Children: []subImage{
+					{
+						Platform:  "linux/amd64",
+						Available: true,
+						Details: imageDetails{
+							ID:          "sha256:abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
+							DiskUsage:   "5.1 MB",
+							InUse:       false,
+							ContentSize: "2.5 MB",
+						},
+					},
+				},
+			},
+		},
+		imageSpacing: false,
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			cli := test.NewFakeCli(nil)
+			cli.In().SetIsTerminal(tc.stdinTty)
+			cli.Out().SetIsTerminal(tc.stdoutTty)
+			cli.Err().SetIsTerminal(tc.stderrTty)
+
+			printImageTree(cli, mockView)
+
+			out := cli.OutBuffer().String()
+			assert.Check(t, len(out) > 0, "Output should not be empty")
+
+			hasAnsi := strings.Contains(out, "\x1b[")
+			if tc.expectedAnsi {
+				assert.Check(t, hasAnsi, "Output should contain ANSI escape codes")
+			} else {
+				assert.Check(t, !hasAnsi, "Output should not contain ANSI escape codes")
+			}
+		})
+	}
+}