--- /dev/null	2020-03-17 13:40:17.000000000 -0700
+++ new/test/jdk/jdk/internal/math/ToDecimal/java.base/jdk/internal/math/BasicChecker.java	2020-03-17 13:40:16.000000000 -0700
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2018-2020 Raffaello Giulietti
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package jdk.internal.math;
+
+class BasicChecker {
+
+    static final boolean FAILURE_THROWS_EXCEPTION = true;
+
+    static void assertTrue(boolean ok, String valueName) {
+        if (ok) {
+            return;
+        }
+        String msg = valueName + " is not correct";
+        if (FAILURE_THROWS_EXCEPTION) {
+            throw new RuntimeException(msg);
+        }
+        System.err.println(msg);
+    }
+
+}