box: add test

box_test.go

@@ -0,0 +1,94 @@
+package tview
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/gdamore/tcell"
+)
+
+const (
+	snapshotPath string = "screen"
+)
+
+func TestBox(t *testing.T) {
+	tcs := []struct {
+		name string
+		box  *Box
+	}{
+		{
+			name: "box.Simple",
+			box:  NewBox(),
+		},
+		{
+			name: "box.Bold.Border",
+			box:  NewBox().SetBorder(true).SetBorderAttributes(tcell.AttrBold).SetTitle("Hello"),
+		},
+		{
+			name: "box.AlignLeft",
+			box:  NewBox().SetBorder(true).SetTitle("Left").SetTitleAlign(AlignLeft),
+		},
+		{
+			name: "box.AlignRight",
+			box:  NewBox().SetBorder(true).SetTitle("Right").SetTitleAlign(AlignRight),
+		},
+		{
+			name: "box.AlignCenter",
+			box:  NewBox().SetBorder(true).SetTitle("Center").SetTitleAlign(AlignCenter),
+		},
+	}
+
+	for i := range tcs {
+		i := i
+		t.Run(tcs[i].name, func(t *testing.T) {
+			t.Parallel()
+			simScreen := tcell.NewSimulationScreen("UTF-8")
+			simScreen.Init()
+			simScreen.SetSize(10, 5)
+
+			app := NewApplication()
+			app.SetScreen(simScreen)
+			app.SetRoot(tcs[i].box, true)
+
+			go func() {
+				if err := app.Run(); err != nil {
+					panic(err)
+				}
+			}()
+
+			time.Sleep(time.Second)
+
+			cells, width, height := simScreen.GetContents()
+			var buf bytes.Buffer
+			for row := 0; row < height; row++ {
+				for col := 0; col < width; col++ {
+					position := row*width + col
+					fmt.Fprintf(&buf, "%s", string(cells[position].Runes))
+				}
+				fmt.Fprintf(&buf, "\n")
+			}
+
+			snapshotFilename := filepath.Join(".", snapshotPath, tcs[i].name)
+
+			if os.Getenv("UPDATE") == "true" {
+				if err := ioutil.WriteFile(snapshotFilename, buf.Bytes(), 0644); err != nil {
+					t.Fatalf("Cannot write snapshot to file: %v", err)
+				}
+			}
+
+			content, err := ioutil.ReadFile(snapshotFilename)
+			if err != nil {
+				t.Fatalf("Cannot read snapshot file: %v", err)
+			}
+
+			if !bytes.Equal(buf.Bytes(), content) {
+				t.Errorf("Snapshots is not same")
+			}
+		})
+	}
+}

screen/box.AlignCenter

@@ -0,0 +1,5 @@
+╔═Center═╗
+║        ║
+║        ║
+║        ║
+╚════════╝

screen/box.AlignLeft

@@ -0,0 +1,5 @@
+╔Left════╗
+║        ║
+║        ║
+║        ║
+╚════════╝

screen/box.AlignRight

@@ -0,0 +1,5 @@
+╔═══Right╗
+║        ║
+║        ║
+║        ║
+╚════════╝

screen/box.Bold.Border

@@ -0,0 +1,5 @@
+╔═Hello══╗
+║        ║
+║        ║
+║        ║
+╚════════╝

screen/box.Simple

@@ -0,0 +1,5 @@
+          
+          
+          
+          
+