--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/source/BytesSourceSectionTest.java	Mon Sep 08 22:21:21 2014 +0100
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2012, 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.
+ */
+package com.oracle.truffle.api.test.source;
+
+import static org.junit.Assert.*;
+
+import java.nio.charset.*;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.source.*;
+
+public class BytesSourceSectionTest {
+
+    @Test
+    public void testSectionsFromLineNumberASCII() {
+        final byte[] bytes = "foo\nbar\nbaz\n".getBytes(StandardCharsets.UTF_8);
+        final Source source = Source.fromBytes(bytes, "description", new BytesDecoder.UTF8BytesDecoder());
+        assertEquals("foo", source.createSection("identifier", 1).getCode());
+        assertEquals("bar", source.createSection("identifier", 2).getCode());
+        assertEquals("baz", source.createSection("identifier", 3).getCode());
+    }
+
+    @Test
+    public void testSectionsFromOffsetsASCII() {
+        final byte[] bytes = "foo\nbar\nbaz\n".getBytes(StandardCharsets.UTF_8);
+        final Source source = Source.fromBytes(bytes, "description", new BytesDecoder.UTF8BytesDecoder());
+        assertEquals("foo", source.createSection("identifier", 0, 3).getCode());
+        assertEquals("bar", source.createSection("identifier", 4, 3).getCode());
+        assertEquals("baz", source.createSection("identifier", 8, 3).getCode());
+    }
+
+    @Test
+    public void testSectionsFromLineNumberUTF8() {
+        // ☃ is three bytes in UTF8
+        final byte[] bytes = "foo\n☃\nbaz\n".getBytes(StandardCharsets.UTF_8);
+        final Source source = Source.fromBytes(bytes, "description", new BytesDecoder.UTF8BytesDecoder());
+        assertEquals("foo", source.createSection("identifier", 1).getCode());
+        assertEquals("☃", source.createSection("identifier", 2).getCode());
+        assertEquals("baz", source.createSection("identifier", 3).getCode());
+    }
+
+    @Test
+    public void testSectionsFromOffsetsUTF8() {
+        // ☃ is three bytes in UTF8
+        final byte[] bytes = "foo\n☃\nbaz\n".getBytes(StandardCharsets.UTF_8);
+        final Source source = Source.fromBytes(bytes, "description", new BytesDecoder.UTF8BytesDecoder());
+        assertEquals("foo", source.createSection("identifier", 0, 3).getCode());
+        assertEquals("☃", source.createSection("identifier", 4, 3).getCode());
+        assertEquals("baz", source.createSection("identifier", 8, 3).getCode());
+    }
+
+    @Test
+    public void testOffset() {
+        final byte[] bytes = "xxxfoo\nbar\nbaz\nxxx".getBytes(StandardCharsets.UTF_8);
+        final Source source = Source.fromBytes(bytes, 3, bytes.length - 6, "description", new BytesDecoder.UTF8BytesDecoder());
+        assertEquals("foo", source.createSection("identifier", 0, 3).getCode());
+        assertEquals("bar", source.createSection("identifier", 4, 3).getCode());
+        assertEquals("baz", source.createSection("identifier", 8, 3).getCode());
+    }
+}