Provide a test demonstrating how to complete in the middle, fixes #274

reader/src/test/java/org/jline/reader/impl/CompletionWithParserTest.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2002-2018, the original author or authors.
+ *
+ * This software is distributable under the BSD license. See the terms of the
+ * BSD license in the documentation provided with this software.
+ *
+ * http://www.opensource.org/licenses/bsd-license.php
+ */
+package org.jline.reader.impl;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+import org.jline.reader.Candidate;
+import org.jline.reader.Completer;
+import org.jline.reader.CompletingParsedLine;
+import org.jline.reader.LineReader;
+import org.jline.reader.LineReader.Option;
+import org.jline.reader.ParsedLine;
+import org.jline.reader.Parser;
+import org.jline.reader.Reference;
+import org.jline.reader.SyntaxError;
+import org.jline.reader.impl.completer.AggregateCompleter;
+import org.jline.reader.impl.completer.ArgumentCompleter;
+import org.jline.reader.impl.completer.NullCompleter;
+import org.jline.reader.impl.completer.StringsCompleter;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import org.junit.Test;
+
+public class CompletionWithParserTest extends ReaderTestSupport {
+
+    @Test
+    public void testComplete() throws IOException {
+        reader.setCompleter((reader, line, candidates) -> candidates.add(new Candidate(
+                /* value    = */ "range",
+                /* displ    = */ "range",
+                /* group    = */ null,
+                /* descr    = */ null,
+                /* suffix   = */ null,
+                /* key      = */ null,
+                /* complete = */ false)));
+        reader.setParser((line, cursor, context) -> new ParsedLine() {
+            @Override
+            public String word() {
+                return "";
+            }
+            @Override
+            public int wordCursor() {
+                return 0;
+            }
+            @Override
+            public int wordIndex() {
+                return 3;
+            }
+            @Override
+            public List<String> words() {
+                return Arrays.asList("{", "List", ".", "", "}");
+            }
+            @Override
+            public String line() {
+                return "{List.}";
+            }
+            @Override
+            public int cursor() {
+                return 6;
+            }
+        });
+
+        assertBuffer("{List.range}", new TestBuffer("{List.}").left().tab());
+    }
+
+}