Add Button test

button_test.go

@@ -0,0 +1,47 @@
+package cview
+
+import (
+	"testing"
+
+	"github.com/gdamore/tcell"
+)
+
+const (
+	testButtonLabelA = "Hello, world!"
+	testButtonLabelB = "Goodnight, moon!"
+)
+
+func TestButton(t *testing.T) {
+	t.Parallel()
+
+	b, sc, err := testButton()
+	if err != nil {
+		t.Error(err)
+	}
+	if b.GetLabel() != testButtonLabelA {
+		t.Errorf("failed to initalize Button: incorrect label: expected %s, got %s", testButtonLabelA, b.GetLabel())
+	}
+
+	b.SetLabel(testButtonLabelB)
+	if b.GetLabel() != testButtonLabelB {
+		t.Errorf("failed to update Button: incorrect label: expected %s, got %s", testButtonLabelB, b.GetLabel())
+	}
+
+	b.SetLabel(testButtonLabelA)
+	if b.GetLabel() != testButtonLabelA {
+		t.Errorf("failed to update Button: incorrect label: expected %s, got %s", testButtonLabelA, b.GetLabel())
+	}
+
+	b.Draw(sc)
+}
+
+func testButton() (*Button, tcell.Screen, error) {
+	b := NewButton(testButtonLabelA)
+
+	sc := tcell.NewSimulationScreen("UTF-8")
+	sc.SetSize(80, 24)
+
+	_ = NewApplication().SetRoot(b, true).SetScreen(sc)
+
+	return b, sc, nil
+}