add stack test and take new stack

scanner/stack_test.go

@@ -0,0 +1,40 @@
+package scanner
+
+import (
+	"testing"
+
+	"github.com/sentriz/gonic/model"
+)
+
+func testAlbum(id int) *model.Album {
+	return &model.Album{IDBase: model.IDBase{id}}
+}
+
+func TestFolderStack(t *testing.T) {
+	expected := "[6, 5, 4, root]"
+	//
+	sta := &folderStack{}
+	sta.push(testAlbum(3))
+	sta.push(testAlbum(4))
+	sta.push(testAlbum(5))
+	sta.push(testAlbum(6))
+	actual := sta.string()
+	if expected != actual {
+		t.Errorf("first stack: expected string %q, got %q",
+			expected, actual)
+	}
+	//
+	sta = &folderStack{}
+	sta.push(testAlbum(3))
+	sta.push(testAlbum(4))
+	sta.peek()
+	sta.push(testAlbum(5))
+	sta.push(testAlbum(6))
+	sta.push(testAlbum(7))
+	sta.pop()
+	actual = sta.string()
+	if expected != actual {
+		t.Errorf("second stack: expected string %q, got %q",
+			expected, actual)
+	}
+}