Shit ton of tests

containers/stacks_test.go

@@ -0,0 +1,108 @@
+package containers_test
+
+import (
+	"testing"
+
+	"git.mstar.dev/mstar/goutils/containers"
+	"git.mstar.dev/mstar/goutils/other"
+)
+
+func TestStack(t *testing.T) {
+	stack := containers.BuildStack[int]()
+	elem, err := stack.Top()
+	switch err {
+	case containers.ErrEmptyQueue:
+	// Expected, continue
+	case containers.ErrInvalidQueue:
+		t.Fatal("New queue is invalid")
+	case nil:
+		t.Fatalf("New queue shouldn't have any elements yet: %v", elem)
+	}
+	elem, err = stack.Pop()
+	switch err {
+	case containers.ErrEmptyQueue:
+	// Expected, continue
+	case containers.ErrInvalidQueue:
+		t.Fatal("New queue is invalid")
+	case nil:
+		t.Fatalf("New queue shouldn't have any elements yet: %v", elem)
+	}
+	if !stack.IsEmpty() {
+		t.Fatal("New queue isn't empty")
+	}
+
+	if err = stack.Push(other.IntoPointer(10)); err != nil {
+		t.Fatal("Failed to push value onto new queue")
+	}
+	if stack.IsEmpty() {
+		t.Fatal("Queue is empty after pushing a value")
+	}
+
+	elem, err = stack.Top()
+	if err != nil {
+		t.Fatalf("Failed to get top element from queue after inserting one: %v", err)
+	}
+	switch {
+	case elem == nil:
+		t.Fatal("Got nil elem; want &10")
+	case *elem == 10:
+	// Expected, continue
+	default:
+		t.Fatalf("Got %v; want &10", *elem)
+	}
+
+	if err = stack.Push(other.IntoPointer(20)); err != nil {
+		t.Fatal("Failed to push value onto queue")
+	}
+
+	elem, err = stack.Top()
+	if err != nil {
+		t.Fatalf("Failed to get top element from queue after inserting one: %v", err)
+	}
+	switch {
+	case elem == nil:
+		t.Fatal("Got nil elem; want &20")
+	case *elem == 20:
+	// Expected, continue
+	default:
+		t.Fatalf("Got %v; want &20", *elem)
+	}
+
+	if stack.IsEmpty() {
+		t.Fatal("Top shouldn't pop an element from the queue")
+	}
+
+	elem, err = stack.Pop()
+	if err != nil {
+		t.Fatalf("Expected no error while popping a value: %v", err)
+	}
+	switch {
+	case elem == nil:
+		t.Fatal("Got nil elem; want &20")
+	case *elem == 20:
+	// Expected, continue
+	default:
+		t.Fatalf("Got %v; want &20", *elem)
+	}
+
+	if stack.IsEmpty() {
+		t.Fatal("Queue should still have one element left")
+	}
+
+	elem, err = stack.Pop()
+	if err != nil {
+		t.Fatalf("Expected no error while popping a value: %v", err)
+	}
+	switch {
+	case elem == nil:
+		t.Fatal("Got nil elem; want &10")
+	case *elem == 10:
+	// Expected, continue
+	default:
+		t.Fatalf("Got %v; want &10", *elem)
+	}
+
+	if !stack.IsEmpty() {
+		t.Fatal("Queue should be empty now")
+	}
+}