refactored dir layout

cmd/stack_test.go

@@ -0,0 +1,190 @@
+/*
+Copyright © 2023 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package cmd
+
+import (
+	"testing"
+)
+
+func TestPush(t *testing.T) {
+	t.Run("push", func(t *testing.T) {
+		s := NewStack()
+		s.Push(5)
+
+		if s.linklist.Back().Value != 5.0 {
+			t.Errorf("push failed:\n+++  got: %f\n--- want: %f",
+				s.linklist.Back().Value, 5.0)
+		}
+	})
+}
+
+func TestPop(t *testing.T) {
+	t.Run("pop", func(t *testing.T) {
+		stack := NewStack()
+		stack.Push(5)
+		got := stack.Pop()
+
+		if got != 5.0 {
+			t.Errorf("pop failed:\n+++  got: %f\n--- want: %f",
+				got, 5.0)
+		}
+
+		if stack.Len() != 0 {
+			t.Errorf("stack not empty after pop()")
+		}
+	})
+}
+
+func TestPops(t *testing.T) {
+	t.Run("pops", func(t *testing.T) {
+		stack := NewStack()
+		stack.Push(5)
+		stack.Push(5)
+		stack.Push(5)
+		stack.Pop()
+
+		if stack.Len() != 2 {
+			t.Errorf("stack len not correct after pop:\n+++  got: %d\n--- want: %d",
+				stack.Len(), 2)
+		}
+	})
+}
+
+func TestShift(t *testing.T) {
+	t.Run("shift", func(t *testing.T) {
+		stack := NewStack()
+		stack.Shift()
+
+		if stack.Len() != 0 {
+			t.Errorf("stack not empty after shift()")
+		}
+	})
+}
+
+func TestClear(t *testing.T) {
+	t.Run("clear", func(t *testing.T) {
+		stack := NewStack()
+		stack.Push(5)
+		stack.Push(5)
+		stack.Push(5)
+		stack.Clear()
+
+		if stack.Len() != 0 {
+			t.Errorf("stack not empty after clear()")
+		}
+	})
+}
+
+func TestLast(t *testing.T) {
+	t.Run("last", func(t *testing.T) {
+		stack := NewStack()
+		stack.Push(5)
+		got := stack.Last()
+
+		if len(got) != 1 {
+			t.Errorf("last failed:\n+++  got: %d elements\n--- want: %d elements",
+				len(got), 1)
+		}
+
+		if got[0] != 5.0 {
+			t.Errorf("last failed:\n+++  got: %f\n--- want: %f",
+				got, 5.0)
+		}
+
+		if stack.Len() != 1 {
+			t.Errorf("stack modified after last()")
+		}
+	})
+}
+
+func TestAll(t *testing.T) {
+	t.Run("all", func(t *testing.T) {
+		stack := NewStack()
+		list := []float64{2, 4, 6, 8}
+
+		for _, item := range list {
+			stack.Push(item)
+		}
+
+		got := stack.All()
+
+		if len(got) != len(list) {
+			t.Errorf("all failed:\n+++  got: %d elements\n--- want: %d elements",
+				len(got), len(list))
+		}
+
+		for i := 1; i < len(list); i++ {
+			if got[i] != list[i] {
+				t.Errorf("all failed (element %d):\n+++  got: %f\n--- want: %f",
+					i, got[i], list[i])
+			}
+		}
+
+		if stack.Len() != len(list) {
+			t.Errorf("stack modified after last()")
+		}
+	})
+}
+
+func TestBackupRestore(t *testing.T) {
+	t.Run("shift", func(t *testing.T) {
+		stack := NewStack()
+		stack.Push(5)
+		stack.Backup()
+		stack.Clear()
+		stack.Restore()
+
+		if stack.Len() != 1 {
+			t.Errorf("stack not correctly restored()")
+		}
+
+		value := stack.Pop()
+		if value != 5.0 {
+			t.Errorf("stack not identical to old revision:\n+++  got: %f\n--- want: %f",
+				value, 5.0)
+		}
+	})
+}
+
+func TestReverse(t *testing.T) {
+	t.Run("reverse", func(t *testing.T) {
+		stack := NewStack()
+		list := []float64{2, 4, 6}
+		reverse := []float64{6, 4, 2}
+
+		for _, item := range list {
+			stack.Push(item)
+		}
+
+		stack.Reverse()
+
+		got := stack.All()
+
+		if len(got) != len(list) {
+			t.Errorf("all failed:\n+++  got: %d elements\n--- want: %d elements",
+				len(got), len(list))
+		}
+
+		for i := 1; i < len(reverse); i++ {
+			if got[i] != reverse[i] {
+				t.Errorf("reverse failed (element %d):\n+++  got: %f\n--- want: %f",
+					i, got[i], list[i])
+			}
+		}
+	})
+}