Improved code quality

errors_test.go

@@ -0,0 +1,19 @@
+package assert_test
+
+import (
+	"testing"
+)
+
+// noop implements the Test interface with noop functions so you can test the failure cases.
+type noop struct{}
+
+// Errorf does nothing.
+func (t *noop) Errorf(format string, args ...any) {}
+
+// FailNow does nothing.
+func (t *noop) FailNow() {}
+
+// fail creates a new test that is expected to fail.
+func fail(t *testing.T) *noop {
+	return &noop{}
+}