feat: empty test for argparser; assertion helpers

internal/testing/assert/assert.go

@@ -0,0 +1,15 @@
+package assert
+
+import "testing"
+
+func Equal[T comparable](t *testing.T, got, want T) {
+	if (got != want) {
+		t.Errorf("not equal %v and %v", got, want)
+	}
+}
+
+func NotEqual[T comparable](t *testing.T, got, want T) {
+	if (got == want) {
+		t.Errorf("unexpected equal %v and %v", got, want)
+	}
+}