package org.apache.lucene.search;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.*;
import java.util.*;
import org.apache.lucene.analysis.*;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.document.*;
import org.apache.lucene.index.*;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.search.similarities.DefaultSimilarity;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.*;
import org.junit.AfterClass;
import org.junit.BeforeClass;
/**
* Tests {@link PhraseQuery}.
*
* @see TestPositionIncrement
*/
public class TestPhraseQuery extends LuceneTestCase {
/** threshold for comparing floats */
public static final float SCORE_COMP_THRESH = 1e-6f;
private static IndexSearcher searcher;
private static IndexReader reader;
private PhraseQuery query;
private static Directory directory;
@BeforeClass
public static void beforeClass() throws Exception {
directory = newDirectory();
Analyzer analyzer = new Analyzer() {
@Override
public TokenStreamComponents createComponents(String fieldName) {
return new TokenStreamComponents(new MockTokenizer(MockTokenizer.WHITESPACE, false));
}
@Override
public int getPositionIncrementGap(String fieldName) {
return 100;
}
};
RandomIndexWriter writer = new RandomIndexWriter(random(), directory, analyzer);
Document doc = new Document();
doc.add(newTextField("field", "one two three four five", Field.Store.YES));
doc.add(newTextField("repeated", "this is a repeated field - first part", Field.Store.YES));
Field repeatedField = newTextField("repeated", "second part of a repeated field", Field.Store.YES);
doc.add(repeatedField);
doc.add(newTextField("palindrome", "one two three two one", Field.Store.YES));
writer.addDocument(doc);
doc = new Document();
doc.add(newTextField("nonexist", "phrase exist notexist exist found", Field.Store.YES));
writer.addDocument(doc);
doc = new Document();
doc.add(newTextField("nonexist", "phrase exist notexist exist found", Field.Store.YES));
writer.addDocument(doc);
reader = writer.getReader();
writer.close();
searcher = newSearcher(reader);
}
@Override
public void setUp() throws Exception {
super.setUp();
query = new PhraseQuery();
}
@AfterClass
public static void afterClass() throws Exception {
searcher = null;
reader.close();
reader = null;
directory.close();
directory = null;
}
public void testNotCloseEnough() throws Exception {
query.setSlop(2);
query.add(new Term("field", "one"));
query.add(new Term("field", "five"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals(0, hits.length);
QueryUtils.check(random(), query,searcher);
}
public void testBarelyCloseEnough() throws Exception {
query.setSlop(3);
query.add(new Term("field", "one"));
query.add(new Term("field", "five"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals(1, hits.length);
QueryUtils.check(random(), query,searcher);
}
/**
* Ensures slop of 0 works for exact matches, but not reversed
*/
public void testExact() throws Exception {
// slop is zero by default
query.add(new Term("field", "four"));
query.add(new Term("field", "five"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("exact match", 1, hits.length);
QueryUtils.check(random(), query,searcher);
query = new PhraseQuery();
query.add(new Term("field", "two"));
query.add(new Term("field", "one"));
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("reverse not exact", 0, hits.length);
QueryUtils.check(random(), query,searcher);
}
public void testSlop1() throws Exception {
// Ensures slop of 1 works with terms in order.
query.setSlop(1);
query.add(new Term("field", "one"));
query.add(new Term("field", "two"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("in order", 1, hits.length);
QueryUtils.check(random(), query,searcher);
// Ensures slop of 1 does not work for phrases out of order;
// must be at least 2.
query = new PhraseQuery();
query.setSlop(1);
query.add(new Term("field", "two"));
query.add(new Term("field", "one"));
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("reversed, slop not 2 or more", 0, hits.length);
QueryUtils.check(random(), query,searcher);
}
/**
* As long as slop is at least 2, terms can be reversed
*/
public void testOrderDoesntMatter() throws Exception {
query.setSlop(2); // must be at least two for reverse order match
query.add(new Term("field", "two"));
query.add(new Term("field", "one"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("just sloppy enough", 1, hits.length);
QueryUtils.check(random(), query,searcher);
query = new PhraseQuery();
query.setSlop(2);
query.add(new Term("field", "three"));
query.add(new Term("field", "one"));
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("not sloppy enough", 0, hits.length);
QueryUtils.check(random(), query,searcher);
}
/**
* slop is the total number of positional moves allowed
* to line up a phrase
*/
public void testMulipleTerms() throws Exception {
query.setSlop(2);
query.add(new Term("field", "one"));
query.add(new Term("field", "three"));
query.add(new Term("field", "five"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("two total moves", 1, hits.length);
QueryUtils.check(random(), query,searcher);
query = new PhraseQuery();
query.setSlop(5); // it takes six moves to match this phrase
query.add(new Term("field", "five"));
query.add(new Term("field", "three"));
query.add(new Term("field", "one"));
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("slop of 5 not close enough", 0, hits.length);
QueryUtils.check(random(), query,searcher);
query.setSlop(6);
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("slop of 6 just right", 1, hits.length);
QueryUtils.check(random(), query,searcher);
}
public void testPhraseQueryWithStopAnalyzer() throws Exception {
Directory directory = newDirectory();
Analyzer stopAnalyzer = new MockAnalyzer(random(), MockTokenizer.SIMPLE, true, MockTokenFilter.ENGLISH_STOPSET);
RandomIndexWriter writer = new RandomIndexWriter(random(), directory,
newIndexWriterConfig(TEST_VERSION_CURRENT, stopAnalyzer));
Document doc = new Document();
doc.add(newTextField("field", "the stop words are here", Field.Store.YES));
writer.addDocument(doc);
IndexReader reader = writer.getReader();
writer.close();
IndexSearcher searcher = newSearcher(reader);
// valid exact phrase query
PhraseQuery query = new PhraseQuery();
query.add(new Term("field","stop"));
query.add(new Term("field","words"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals(1, hits.length);
QueryUtils.check(random(), query,searcher);
reader.close();
directory.close();
}
public void testPhraseQueryInConjunctionScorer() throws Exception {
Directory directory = newDirectory();
RandomIndexWriter writer = new RandomIndexWriter(random(), directory);
Document doc = new Document();
doc.add(newTextField("source", "marketing info", Field.Store.YES));
writer.addDocument(doc);
doc = new Document();
doc.add(newTextField("contents", "foobar", Field.Store.YES));
doc.add(newTextField("source", "marketing info", Field.Store.YES));
writer.addDocument(doc);
IndexReader reader = writer.getReader();
writer.close();
IndexSearcher searcher = newSearcher(reader);
PhraseQuery phraseQuery = new PhraseQuery();
phraseQuery.add(new Term("source", "marketing"));
phraseQuery.add(new Term("source", "info"));
ScoreDoc[] hits = searcher.search(phraseQuery, null, 1000).scoreDocs;
assertEquals(2, hits.length);
QueryUtils.check(random(), phraseQuery,searcher);
TermQuery termQuery = new TermQuery(new Term("contents","foobar"));
BooleanQuery booleanQuery = new BooleanQuery();
booleanQuery.add(termQuery, BooleanClause.Occur.MUST);
booleanQuery.add(phraseQuery, BooleanClause.Occur.MUST);
hits = searcher.search(booleanQuery, null, 1000).scoreDocs;
assertEquals(1, hits.length);
QueryUtils.check(random(), termQuery,searcher);
reader.close();
writer = new RandomIndexWriter(random(), directory,
newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random())).setOpenMode(OpenMode.CREATE));
doc = new Document();
doc.add(newTextField("contents", "map entry woo", Field.Store.YES));
writer.addDocument(doc);
doc = new Document();
doc.add(newTextField("contents", "woo map entry", Field.Store.YES));
writer.addDocument(doc);
doc = new Document();
doc.add(newTextField("contents", "map foobarword entry woo", Field.Store.YES));
writer.addDocument(doc);
reader = writer.getReader();
writer.close();
searcher = newSearcher(reader);
termQuery = new TermQuery(new Term("contents","woo"));
phraseQuery = new PhraseQuery();
phraseQuery.add(new Term("contents","map"));
phraseQuery.add(new Term("contents","entry"));
hits = searcher.search(termQuery, null, 1000).scoreDocs;
assertEquals(3, hits.length);
hits = searcher.search(phraseQuery, null, 1000).scoreDocs;
assertEquals(2, hits.length);
booleanQuery = new BooleanQuery();
booleanQuery.add(termQuery, BooleanClause.Occur.MUST);
booleanQuery.add(phraseQuery, BooleanClause.Occur.MUST);
hits = searcher.search(booleanQuery, null, 1000).scoreDocs;
assertEquals(2, hits.length);
booleanQuery = new BooleanQuery();
booleanQuery.add(phraseQuery, BooleanClause.Occur.MUST);
booleanQuery.add(termQuery, BooleanClause.Occur.MUST);
hits = searcher.search(booleanQuery, null, 1000).scoreDocs;
assertEquals(2, hits.length);
QueryUtils.check(random(), booleanQuery,searcher);
reader.close();
directory.close();
}
public void testSlopScoring() throws IOException {
Directory directory = newDirectory();
RandomIndexWriter writer = new RandomIndexWriter(random(), directory,
newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
.setMergePolicy(newLogMergePolicy())
.setSimilarity(new DefaultSimilarity()));
Document doc = new Document();
doc.add(newTextField("field", "foo firstname lastname foo", Field.Store.YES));
writer.addDocument(doc);
Document doc2 = new Document();
doc2.add(newTextField("field", "foo firstname zzz lastname foo", Field.Store.YES));
writer.addDocument(doc2);
Document doc3 = new Document();
doc3.add(newTextField("field", "foo firstname zzz yyy lastname foo", Field.Store.YES));
writer.addDocument(doc3);
IndexReader reader = writer.getReader();
writer.close();
IndexSearcher searcher = newSearcher(reader);
searcher.setSimilarity(new DefaultSimilarity());
PhraseQuery query = new PhraseQuery();
query.add(new Term("field", "firstname"));
query.add(new Term("field", "lastname"));
query.setSlop(Integer.MAX_VALUE);
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals(3, hits.length);
// Make sure that those matches where the terms appear closer to
// each other get a higher score:
assertEquals(0.71, hits[0].score, 0.01);
assertEquals(0, hits[0].doc);
assertEquals(0.44, hits[1].score, 0.01);
assertEquals(1, hits[1].doc);
assertEquals(0.31, hits[2].score, 0.01);
assertEquals(2, hits[2].doc);
QueryUtils.check(random(), query,searcher);
reader.close();
directory.close();
}
public void testToString() throws Exception {
PhraseQuery q = new PhraseQuery(); // Query "this hi this is a test is"
q.add(new Term("field", "hi"), 1);
q.add(new Term("field", "test"), 5);
assertEquals("field:\"? hi ? ? ? test\"", q.toString());
q.add(new Term("field", "hello"), 1);
assertEquals("field:\"? hi|hello ? ? ? test\"", q.toString());
}
public void testWrappedPhrase() throws IOException {
query.add(new Term("repeated", "first"));
query.add(new Term("repeated", "part"));
query.add(new Term("repeated", "second"));
query.add(new Term("repeated", "part"));
query.setSlop(100);
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("slop of 100 just right", 1, hits.length);
QueryUtils.check(random(), query,searcher);
query.setSlop(99);
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("slop of 99 not enough", 0, hits.length);
QueryUtils.check(random(), query,searcher);
}
// work on two docs like this: "phrase exist notexist exist found"
public void testNonExistingPhrase() throws IOException {
// phrase without repetitions that exists in 2 docs
query.add(new Term("nonexist", "phrase"));
query.add(new Term("nonexist", "notexist"));
query.add(new Term("nonexist", "found"));
query.setSlop(2); // would be found this way
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("phrase without repetitions exists in 2 docs", 2, hits.length);
QueryUtils.check(random(), query,searcher);
// phrase with repetitions that exists in 2 docs
query = new PhraseQuery();
query.add(new Term("nonexist", "phrase"));
query.add(new Term("nonexist", "exist"));
query.add(new Term("nonexist", "exist"));
query.setSlop(1); // would be found
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("phrase with repetitions exists in two docs", 2, hits.length);
QueryUtils.check(random(), query,searcher);
// phrase I with repetitions that does not exist in any doc
query = new PhraseQuery();
query.add(new Term("nonexist", "phrase"));
query.add(new Term("nonexist", "notexist"));
query.add(new Term("nonexist", "phrase"));
query.setSlop(1000); // would not be found no matter how high the slop is
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("nonexisting phrase with repetitions does not exist in any doc", 0, hits.length);
QueryUtils.check(random(), query,searcher);
// phrase II with repetitions that does not exist in any doc
query = new PhraseQuery();
query.add(new Term("nonexist", "phrase"));
query.add(new Term("nonexist", "exist"));
query.add(new Term("nonexist", "exist"));
query.add(new Term("nonexist", "exist"));
query.setSlop(1000); // would not be found no matter how high the slop is
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("nonexisting phrase with repetitions does not exist in any doc", 0, hits.length);
QueryUtils.check(random(), query,searcher);
}
/**
* Working on a 2 fields like this:
* Field("field", "one two three four five")
* Field("palindrome", "one two three two one")
* Phrase of size 2 occuriong twice, once in order and once in reverse,
* because doc is a palyndrome, is counted twice.
* Also, in this case order in query does not matter.
* Also, when an exact match is found, both sloppy scorer and exact scorer scores the same.
*/
public void testPalyndrome2() throws Exception {
// search on non palyndrome, find phrase with no slop, using exact phrase scorer
query.setSlop(0); // to use exact phrase scorer
query.add(new Term("field", "two"));
query.add(new Term("field", "three"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("phrase found with exact phrase scorer", 1, hits.length);
float score0 = hits[0].score;
//System.out.println("(exact) field: two three: "+score0);
QueryUtils.check(random(), query,searcher);
// search on non palyndrome, find phrase with slop 2, though no slop required here.
query.setSlop(2); // to use sloppy scorer
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("just sloppy enough", 1, hits.length);
float score1 = hits[0].score;
//System.out.println("(sloppy) field: two three: "+score1);
assertEquals("exact scorer and sloppy scorer score the same when slop does not matter",score0, score1, SCORE_COMP_THRESH);
QueryUtils.check(random(), query,searcher);
// search ordered in palyndrome, find it twice
query = new PhraseQuery();
query.setSlop(2); // must be at least two for both ordered and reversed to match
query.add(new Term("palindrome", "two"));
query.add(new Term("palindrome", "three"));
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("just sloppy enough", 1, hits.length);
//float score2 = hits[0].score;
//System.out.println("palindrome: two three: "+score2);
QueryUtils.check(random(), query,searcher);
//commented out for sloppy-phrase efficiency (issue 736) - see SloppyPhraseScorer.phraseFreq().
//assertTrue("ordered scores higher in palindrome",score1+SCORE_COMP_THRESH<score2);
// search reveresed in palyndrome, find it twice
query = new PhraseQuery();
query.setSlop(2); // must be at least two for both ordered and reversed to match
query.add(new Term("palindrome", "three"));
query.add(new Term("palindrome", "two"));
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("just sloppy enough", 1, hits.length);
//float score3 = hits[0].score;
//System.out.println("palindrome: three two: "+score3);
QueryUtils.check(random(), query,searcher);
//commented out for sloppy-phrase efficiency (issue 736) - see SloppyPhraseScorer.phraseFreq().
//assertTrue("reversed scores higher in palindrome",score1+SCORE_COMP_THRESH<score3);
//assertEquals("ordered or reversed does not matter",score2, score3, SCORE_COMP_THRESH);
}
/**
* Working on a 2 fields like this:
* Field("field", "one two three four five")
* Field("palindrome", "one two three two one")
* Phrase of size 3 occuriong twice, once in order and once in reverse,
* because doc is a palyndrome, is counted twice.
* Also, in this case order in query does not matter.
* Also, when an exact match is found, both sloppy scorer and exact scorer scores the same.
*/
public void testPalyndrome3() throws Exception {
// search on non palyndrome, find phrase with no slop, using exact phrase scorer
query.setSlop(0); // to use exact phrase scorer
query.add(new Term("field", "one"));
query.add(new Term("field", "two"));
query.add(new Term("field", "three"));
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("phrase found with exact phrase scorer", 1, hits.length);
float score0 = hits[0].score;
//System.out.println("(exact) field: one two three: "+score0);
QueryUtils.check(random(), query,searcher);
// just make sure no exc:
searcher.explain(query, 0);
// search on non palyndrome, find phrase with slop 3, though no slop required here.
query.setSlop(4); // to use sloppy scorer
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("just sloppy enough", 1, hits.length);
float score1 = hits[0].score;
//System.out.println("(sloppy) field: one two three: "+score1);
assertEquals("exact scorer and sloppy scorer score the same when slop does not matter",score0, score1, SCORE_COMP_THRESH);
QueryUtils.check(random(), query,searcher);
// search ordered in palyndrome, find it twice
query = new PhraseQuery();
query.setSlop(4); // must be at least four for both ordered and reversed to match
query.add(new Term("palindrome", "one"));
query.add(new Term("palindrome", "two"));
query.add(new Term("palindrome", "three"));
hits = searcher.search(query, null, 1000).scoreDocs;
// just make sure no exc:
searcher.explain(query, 0);
assertEquals("just sloppy enough", 1, hits.length);
//float score2 = hits[0].score;
//System.out.println("palindrome: one two three: "+score2);
QueryUtils.check(random(), query,searcher);
//commented out for sloppy-phrase efficiency (issue 736) - see SloppyPhraseScorer.phraseFreq().
//assertTrue("ordered scores higher in palindrome",score1+SCORE_COMP_THRESH<score2);
// search reveresed in palyndrome, find it twice
query = new PhraseQuery();
query.setSlop(4); // must be at least four for both ordered and reversed to match
query.add(new Term("palindrome", "three"));
query.add(new Term("palindrome", "two"));
query.add(new Term("palindrome", "one"));
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("just sloppy enough", 1, hits.length);
//float score3 = hits[0].score;
//System.out.println("palindrome: three two one: "+score3);
QueryUtils.check(random(), query,searcher);
//commented out for sloppy-phrase efficiency (issue 736) - see SloppyPhraseScorer.phraseFreq().
//assertTrue("reversed scores higher in palindrome",score1+SCORE_COMP_THRESH<score3);
//assertEquals("ordered or reversed does not matter",score2, score3, SCORE_COMP_THRESH);
}
// LUCENE-1280
public void testEmptyPhraseQuery() throws Throwable {
final BooleanQuery q2 = new BooleanQuery();
q2.add(new PhraseQuery(), BooleanClause.Occur.MUST);
q2.toString();
}
/* test that a single term is rewritten to a term query */
public void testRewrite() throws IOException {
PhraseQuery pq = new PhraseQuery();
pq.add(new Term("foo", "bar"));
Query rewritten = pq.rewrite(searcher.getIndexReader());
assertTrue(rewritten instanceof TermQuery);
}
public void testRandomPhrases() throws Exception {
Directory dir = newDirectory();
Analyzer analyzer = new MockAnalyzer(random());
RandomIndexWriter w = new RandomIndexWriter(random(), dir, newIndexWriterConfig(TEST_VERSION_CURRENT, analyzer).setMergePolicy(newLogMergePolicy()));
List<List<String>> docs = new ArrayList<>();
Document d = new Document();
Field f = newTextField("f", "", Field.Store.NO);
d.add(f);
Random r = random();
int NUM_DOCS = atLeast(10);
for (int i = 0; i < NUM_DOCS; i++) {
// must be > 4096 so it spans multiple chunks
int termCount = TestUtil.nextInt(random(), 4097, 8200);
List<String> doc = new ArrayList<>();
StringBuilder sb = new StringBuilder();
while(doc.size() < termCount) {
if (r.nextInt(5) == 1 || docs.size() == 0) {
// make new non-empty-string term
String term;
while(true) {
term = TestUtil.randomUnicodeString(r);
if (term.length() > 0) {
break;
}
}
try (TokenStream ts = analyzer.tokenStream("ignore", term)) {
CharTermAttribute termAttr = ts.addAttribute(CharTermAttribute.class);
ts.reset();
while(ts.incrementToken()) {
String text = termAttr.toString();
doc.add(text);
sb.append(text).append(' ');
}
ts.end();
}
} else {
// pick existing sub-phrase
List<String> lastDoc = docs.get(r.nextInt(docs.size()));
int len = TestUtil.nextInt(r, 1, 10);
int start = r.nextInt(lastDoc.size()-len);
for(int k=start;k<start+len;k++) {
String t = lastDoc.get(k);
doc.add(t);
sb.append(t).append(' ');
}
}
}
docs.add(doc);
f.setStringValue(sb.toString());
w.addDocument(d);
}
IndexReader reader = w.getReader();
IndexSearcher s = newSearcher(reader);
w.close();
// now search
int num = atLeast(10);
for(int i=0;i<num;i++) {
int docID = r.nextInt(docs.size());
List<String> doc = docs.get(docID);
final int numTerm = TestUtil.nextInt(r, 2, 20);
final int start = r.nextInt(doc.size()-numTerm);
PhraseQuery pq = new PhraseQuery();
StringBuilder sb = new StringBuilder();
for(int t=start;t<start+numTerm;t++) {
pq.add(new Term("f", doc.get(t)));
sb.append(doc.get(t)).append(' ');
}
TopDocs hits = s.search(pq, NUM_DOCS);
boolean found = false;
for(int j=0;j<hits.scoreDocs.length;j++) {
if (hits.scoreDocs[j].doc == docID) {
found = true;
break;
}
}
assertTrue("phrase '" + sb + "' not found; start=" + start, found);
}
reader.close();
dir.close();
}
public void testNegativeSlop() throws Exception {
PhraseQuery query = new PhraseQuery();
query.add(new Term("field", "two"));
query.add(new Term("field", "one"));
try {
query.setSlop(-2);
fail("didn't get expected exception");
} catch (IllegalArgumentException expected) {
// expected exception
}
}
}