[🤖] Add Unit-Tests

langext/os_test.go

@@ -0,0 +1,28 @@
+package langext
+
+import (
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFileExistsTrue(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "f.txt")
+	if err := os.WriteFile(path, []byte("hi"), 0o644); err != nil {
+		t.Fatalf("setup failed: %v", err)
+	}
+	tst.AssertEqual(t, FileExists(path), true)
+}
+
+func TestFileExistsFalse(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "missing.txt")
+	tst.AssertEqual(t, FileExists(path), false)
+}
+
+func TestFileExistsDirectoryReturnsFalse(t *testing.T) {
+	dir := t.TempDir()
+	tst.AssertEqual(t, FileExists(dir), false)
+}