diff -r 4ebc2e2fb97c -r 71c04702a3d5 test/langtools/jdk/jshell/ExpectedDiagnostic.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/jdk/jshell/ExpectedDiagnostic.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import javax.tools.Diagnostic;
+
+import jdk.jshell.Diag;
+import static org.testng.Assert.assertEquals;
+
+public class ExpectedDiagnostic {
+
+    private final String code;
+    private final long startPosition;
+    private final long endPosition;
+    private final long position;
+    private final long lineNumber;
+    private final long columnNumber;
+    private final Diagnostic.Kind kind;
+
+    public ExpectedDiagnostic(
+            String code, long startPosition, long endPosition,
+            long position, long lineNumber, long columnNumber,
+            Diagnostic.Kind kind) {
+        this.code = code;
+        this.startPosition = startPosition;
+        this.endPosition = endPosition;
+        this.position = position;
+        this.lineNumber = lineNumber;
+        this.columnNumber = columnNumber;
+        this.kind = kind;
+    }
+
+    public long getStartPosition() {
+        return startPosition;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public long getEndPosition() {
+        return endPosition;
+    }
+
+    public long getPosition() {
+        return position;
+    }
+
+    public long getLineNumber() {
+        return lineNumber;
+    }
+
+    public long getColumnNumber() {
+        return columnNumber;
+    }
+
+    public Diagnostic.Kind getKind() {
+        return kind;
+    }
+
+    public void assertDiagnostic(Diag diagnostic) {
+        String code = diagnostic.getCode();
+        assertEquals(code, this.code, "Expected error: " + this.code + ", got: " + code);
+        assertEquals(diagnostic.isError(), kind == Diagnostic.Kind.ERROR);
+        if (startPosition != -1) {
+            assertEquals(diagnostic.getStartPosition(), startPosition, "Start position");
+        }
+        if (endPosition != -1) {
+            assertEquals(diagnostic.getEndPosition(), endPosition, "End position");
+        }
+        if (position != -1) {
+            assertEquals(diagnostic.getPosition(), position, "Position");
+        }
+    }
+}