Refactor ww4test to testenv

- Remove global state
- Remove redundant data
- Remove unused functionality (e.g., file permissions)
- Separate directory creation from file writing
- Additional helper functions for file reading and cleanup

Signed-off-by: Jonathon Anderson <janderson@ciq.com>
Signed-off-by: Christian Goll <cgoll@suse.com>

internal/pkg/testenv/testenv_test.go

@@ -0,0 +1,35 @@
+package testenv
+
+import (
+	"testing"
+
+	"github.com/hpcng/warewulf/internal/pkg/node"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Basic(t *testing.T) {
+	env := New(t)
+	defer env.RemoveAll(t)
+	nodedb, err := node.New()
+	assert.NoError(t, err)
+	nodes, err := nodedb.FindAllNodes()
+	assert.NoError(t, err)
+	assert.Len(t, nodes, 1)
+}
+
+func Test_two_nodes(t *testing.T) {
+	env := New(t)
+	env.WriteFile(t, "etc/warewulf/nodes.conf", `WW_INTERNAL: 43
+nodeprofiles:
+  default: {}
+nodes:
+  node1: {}
+  node2: {}
+`)
+	defer env.RemoveAll(t)
+	nodedb, err := node.New()
+	assert.NoError(t, err)
+	nodes, err := nodedb.FindAllNodes()
+	assert.NoError(t, err)
+	assert.Len(t, nodes, 2)
+}