show last element in stack string

scanner/stack/stack_test.go

@@ -0,0 +1,40 @@
+package stack
+
+import (
+	"testing"
+
+	"github.com/sentriz/gonic/model"
+)
+
+func egAlbum(id int) *model.Album {
+	return &model.Album{IDBase: model.IDBase{id}}
+}
+
+func TestFolderStack(t *testing.T) {
+	sta := &Stack{}
+	sta.Push(egAlbum(3))
+	sta.Push(egAlbum(4))
+	sta.Push(egAlbum(5))
+	sta.Push(egAlbum(6))
+	expected := "[6, 5, 4, 3, ]"
+	actual := sta.String()
+	if expected != actual {
+		t.Errorf("first stack: expected string %q, got %q",
+			expected, actual)
+	}
+	//
+	sta = &Stack{}
+	sta.Push(egAlbum(27))
+	sta.Push(egAlbum(4))
+	sta.Peek()
+	sta.Push(egAlbum(5))
+	sta.Push(egAlbum(6))
+	sta.Push(egAlbum(7))
+	sta.Pop()
+	expected = "[6, 5, 4, 27, ]"
+	actual = sta.String()
+	if expected != actual {
+		t.Errorf("second stack: expected string %q, got %q",
+			expected, actual)
+	}
+}