Refactor significance heuristic tests for easier extensability

server/src/test/java/org/elasticsearch/search/aggregations/bucket/terms/SignificantTermsAggregatorTests.java

@@ -40,17 +40,35 @@
 import org.elasticsearch.search.aggregations.AggregationBuilder;
 import org.elasticsearch.search.aggregations.AggregatorTestCase;
 import org.elasticsearch.search.aggregations.bucket.terms.SignificantTermsAggregatorFactory.ExecutionMode;
+import org.elasticsearch.search.aggregations.bucket.terms.heuristic.ChiSquare;
+import org.elasticsearch.search.aggregations.bucket.terms.heuristic.GND;
+import org.elasticsearch.search.aggregations.bucket.terms.heuristic.JLHScore;
+import org.elasticsearch.search.aggregations.bucket.terms.heuristic.MutualInformation;
+import org.elasticsearch.search.aggregations.bucket.terms.heuristic.PercentageScore;
+import org.elasticsearch.search.aggregations.bucket.terms.heuristic.SignificanceHeuristic;
 import org.elasticsearch.search.aggregations.support.CoreValuesSourceType;
 import org.elasticsearch.search.aggregations.support.ValuesSourceType;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
 import static org.elasticsearch.search.aggregations.AggregationBuilders.significantTerms;
 import static org.hamcrest.Matchers.equalTo;
 
 public class SignificantTermsAggregatorTests extends AggregatorTestCase {
+
+    static SignificanceHeuristic getRandomSignificanceheuristic() {
+        List<SignificanceHeuristic> heuristics = new ArrayList<>();
+        heuristics.add(new JLHScore());
+        heuristics.add(new MutualInformation(randomBoolean(), randomBoolean()));
+        heuristics.add(new GND(randomBoolean()));
+        heuristics.add(new ChiSquare(randomBoolean(), randomBoolean()));
+        heuristics.add(new PercentageScore());
+        return heuristics.get(randomInt(4));
+    }
+
     @Override
     protected AggregationBuilder createAggBuilderForTypeTest(MappedFieldType fieldType, String fieldName) {
         return new SignificantTermsAggregationBuilder("foo").field(fieldName);
@@ -75,10 +93,7 @@ protected List<String> unsupportedMappedFieldTypes() {
         );
     }
 
-    /**
-     * Uses the significant terms aggregation to find the keywords in text fields
-     */
-    public void testSignificance() throws IOException {
+    public void testSignificance(SignificanceHeuristic heuristic) throws IOException  {
         TextFieldType textFieldType = new TextFieldType("text");
         textFieldType.setFielddata(true);
 
@@ -135,7 +150,7 @@ public void testSignificance() throws IOException {
                 String evenStrings[] = new String[] {"even", "regular"};
 
                 sigAgg.includeExclude(new IncludeExclude(oddStrings, evenStrings));
-                sigAgg.significanceHeuristic(SignificanceHeuristicTests.getRandomSignificanceheuristic());
+                sigAgg.significanceHeuristic(heuristic);
                 terms = searchAndReduce(searcher, new TermQuery(new Term("text", "odd")), sigAgg, textFieldType);
                 assertThat(terms.getSubsetSize(), equalTo(5L));
                 assertEquals(1, terms.getBuckets().size());
@@ -159,6 +174,13 @@ public void testSignificance() throws IOException {
         }
     }
 
+    /**
+     * Uses the significant terms aggregation to find the keywords in text fields
+     */
+    public void testSignificance() throws IOException {
+        testSignificance(getRandomSignificanceheuristic());
+    }
+
     /**
      * Uses the significant terms aggregation to find the keywords in numeric
      * fields
@@ -167,8 +189,6 @@ public void testNumericSignificance() throws IOException {
         NumberFieldType longFieldType
             = new NumberFieldMapper.NumberFieldType("long_field", NumberFieldMapper.NumberType.LONG);
 
-        TextFieldType textFieldType = new TextFieldType("text");
-
         IndexWriterConfig indexWriterConfig = newIndexWriterConfig();
         indexWriterConfig.setMaxBufferedDocs(100);
         indexWriterConfig.setRAMBufferSizeMB(100); // flush on open to have a single segment
@@ -257,8 +277,6 @@ public void testUnmapped() throws IOException {
      */
     public void testRangeField() throws IOException {
         RangeType rangeType = RangeType.DOUBLE;
-        final RangeFieldMapper.Range range1 = new RangeFieldMapper.Range(rangeType, 1.0D, 5.0D, true, true);
-        final RangeFieldMapper.Range range2 = new RangeFieldMapper.Range(rangeType, 6.0D, 10.0D, true, true);
         final String fieldName = "rangeField";
         MappedFieldType fieldType = new RangeFieldMapper.RangeFieldType(fieldName, rangeType);
 

server/src/test/java/org/elasticsearch/search/aggregations/bucket/terms/heuristic/ChiSquareTests.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.search.aggregations.bucket.terms.heuristic;
+
+import org.elasticsearch.search.aggregations.bucket.terms.AbstractSignificanceHeuristicTests;
+
+public class ChiSquareTests extends AbstractSignificanceHeuristicTests {
+    @Override
+    protected SignificanceHeuristic getHeuristic() {
+        return new ChiSquare(randomBoolean(), randomBoolean());
+    }
+
+    @Override
+    protected boolean testZeroScore() {
+        return false;
+    }
+
+    @Override
+    public void testAssertions() {
+        testBackgroundAssertions(new ChiSquare(true, true), new ChiSquare(true, false));
+    }
+}

server/src/test/java/org/elasticsearch/search/aggregations/bucket/terms/heuristic/GNDTests.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.search.aggregations.bucket.terms.heuristic;
+
+import org.elasticsearch.search.aggregations.bucket.terms.AbstractSignificanceHeuristicTests;
+
+import static org.hamcrest.Matchers.equalTo;
+
+public class GNDTests extends AbstractSignificanceHeuristicTests {
+    @Override
+    protected SignificanceHeuristic getHeuristic() {
+        return new GND(randomBoolean());
+    }
+
+    @Override
+    protected boolean testZeroScore() {
+        return true;
+    }
+
+    @Override
+    public void testAssertions() {
+        testBackgroundAssertions(new GND(true), new GND(false));
+    }
+
+    public void testGNDCornerCases() {
+        GND gnd = new GND(true);
+        //term is only in the subset, not at all in the other set but that is because the other set is empty.
+        // this should actually not happen because only terms that are in the subset are considered now,
+        // however, in this case the score should be 0 because a term that does not exist cannot be relevant...
+        assertThat(gnd.getScore(0, randomIntBetween(1, 2), 0, randomIntBetween(2,3)), equalTo(0.0));
+        // the terms do not co-occur at all - should be 0
+        assertThat(gnd.getScore(0, randomIntBetween(1, 2), randomIntBetween(2, 3), randomIntBetween(5,6)), equalTo(0.0));
+        // comparison between two terms that do not exist - probably not relevant
+        assertThat(gnd.getScore(0, 0, 0, randomIntBetween(1,2)), equalTo(0.0));
+        // terms co-occur perfectly - should be 1
+        assertThat(gnd.getScore(1, 1, 1, 1), equalTo(1.0));
+        gnd = new GND(false);
+        assertThat(gnd.getScore(0, 0, 0, 0), equalTo(0.0));
+    }
+}

server/src/test/java/org/elasticsearch/search/aggregations/bucket/terms/heuristic/JLHScoreTests.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.search.aggregations.bucket.terms.heuristic;
+
+import org.elasticsearch.search.aggregations.bucket.terms.AbstractSignificanceHeuristicTests;
+
+public class JLHScoreTests extends AbstractSignificanceHeuristicTests {
+    @Override
+    protected SignificanceHeuristic getHeuristic() {
+        return new JLHScore();
+    }
+
+    @Override
+    protected boolean testZeroScore() {
+        return true;
+    }
+
+    @Override
+    public void testAssertions() {
+        testAssertions(new JLHScore());
+    }
+}

server/src/test/java/org/elasticsearch/search/aggregations/bucket/terms/heuristic/MutualInformationTests.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.search.aggregations.bucket.terms.heuristic;
+
+import org.elasticsearch.search.aggregations.bucket.terms.AbstractSignificanceHeuristicTests;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.greaterThan;
+import static org.hamcrest.Matchers.greaterThanOrEqualTo;
+import static org.hamcrest.Matchers.lessThan;
+import static org.hamcrest.Matchers.lessThanOrEqualTo;
+
+public class MutualInformationTests extends AbstractSignificanceHeuristicTests {
+    @Override
+    protected SignificanceHeuristic getHeuristic() {
+        return new MutualInformation(randomBoolean(), randomBoolean());
+    }
+
+    @Override
+    protected boolean testZeroScore() {
+        return false;
+    }
+
+    @Override
+    public void testAssertions() {
+        testBackgroundAssertions(new MutualInformation(true, true), new MutualInformation(true, false));
+    }
+
+    public void testScoreMutual() {
+        SignificanceHeuristic heuristic = new MutualInformation(true, true);
+        assertThat(heuristic.getScore(1, 1, 1, 3), greaterThan(0.0));
+        assertThat(heuristic.getScore(1, 1, 2, 3), lessThan(heuristic.getScore(1, 1, 1, 3)));
+        assertThat(heuristic.getScore(2, 2, 2, 4), equalTo(1.0));
+        assertThat(heuristic.getScore(0, 2, 2, 4), equalTo(1.0));
+        assertThat(heuristic.getScore(2, 2, 4, 4), equalTo(0.0));
+        assertThat(heuristic.getScore(1, 2, 2, 4), equalTo(0.0));
+        assertThat(heuristic.getScore(3, 6, 9, 18), equalTo(0.0));
+
+        double score = 0.0;
+        try {
+            long a = randomLong();
+            long b = randomLong();
+            long c = randomLong();
+            long d = randomLong();
+            score = heuristic.getScore(a, b, c, d);
+        } catch (IllegalArgumentException e) {
+        }
+        assertThat(score, lessThanOrEqualTo(1.0));
+        assertThat(score, greaterThanOrEqualTo(0.0));
+        heuristic = new MutualInformation(false, true);
+        assertThat(heuristic.getScore(0, 1, 2, 3), equalTo(Double.NEGATIVE_INFINITY));
+
+        heuristic = new MutualInformation(true, false);
+        score = heuristic.getScore(2, 3, 1, 4);
+        assertThat(score, greaterThanOrEqualTo(0.0));
+        assertThat(score, lessThanOrEqualTo(1.0));
+        score = heuristic.getScore(1, 4, 2, 3);
+        assertThat(score, greaterThanOrEqualTo(0.0));
+        assertThat(score, lessThanOrEqualTo(1.0));
+        score = heuristic.getScore(1, 3, 4, 4);
+        assertThat(score, greaterThanOrEqualTo(0.0));
+        assertThat(score, lessThanOrEqualTo(1.0));
+    }
+
+}

server/src/test/java/org/elasticsearch/search/aggregations/bucket/terms/heuristic/PercentageScoreTests.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.search.aggregations.bucket.terms.heuristic;
+
+import org.elasticsearch.search.aggregations.bucket.terms.AbstractSignificanceHeuristicTests;
+
+public class PercentageScoreTests extends AbstractSignificanceHeuristicTests {
+    @Override
+    protected SignificanceHeuristic getHeuristic() {
+        return new PercentageScore();
+    }
+
+    @Override
+    protected boolean testZeroScore() {
+        return true;
+    }
+
+    @Override
+    public void testAssertions() {
+        testAssertions(new PercentageScore());
+    }
+}