Linereader Candidate: tests for sorting and potential int overflow fix

reader/src/main/java/org/jline/reader/Candidate.java

@@ -166,7 +166,7 @@ public int compareTo(Candidate o) {
     	if( sort == o.sort() ) {
             return value.compareTo(o.value);
     	} else {
-    		return sort - o.sort();
+    		return Integer.compare(sort, o.sort());
     	}
     }
 

reader/src/test/java/org/jline/reader/CandidateTest.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2021, 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.
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ */
+package org.jline.reader;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class CandidateTest {
+
+    @Test
+    public void testCandidatesSortedByValue() {
+        List<Candidate> candidates = Arrays.asList(
+            new Candidate("cand3", "cand3", null, null, null, null, true),
+            new Candidate("cand1", "cand1", null, null, null, null, true),
+            new Candidate("cand2", "cand2", null, null, null, null, true)
+        );
+        Collections.sort(candidates);
+
+        assertEquals("cand1", candidates.get(0).value());
+        assertEquals("cand2", candidates.get(1).value());
+        assertEquals("cand3", candidates.get(2).value());
+    }
+
+    @Test
+    public void testCandidatesSortedBySortProperty() {
+        List<Candidate> candidates = Arrays.asList(
+            new Candidate("cand3", "cand3", null, null, null, null, true, 3),
+            new Candidate("cand1", "cand1", null, null, null, null, true, 1),
+            new Candidate("cand2", "cand2", null, null, null, null, true, 2)
+        );
+        Collections.sort(candidates);
+
+        assertEquals("cand1", candidates.get(0).value());
+        assertEquals("cand2", candidates.get(1).value());
+        assertEquals("cand3", candidates.get(2).value());
+    }
+
+    @Test
+    public void testCandidatesSortedByValueAndSortProperty() {
+        List<Candidate> candidates = Arrays.asList(
+            new Candidate("cand3", "cand3", null, null, null, null, true, -3),
+            new Candidate("aaa", "cand1", null, null, null, null, true),
+            new Candidate("cand2", "cand2", null, null, null, null, true, 2)
+        );
+        Collections.sort(candidates);
+
+        assertEquals("cand3", candidates.get(0).value());
+        assertEquals("aaa", candidates.get(1).value());
+        assertEquals("cand2", candidates.get(2).value());
+    }
+
+    @Test
+    public void testCandidatesSortedByCornerSortProps() {
+        List<Candidate> candidates = Arrays.asList(
+            new Candidate("cand1", "cand1", null, null, null, null, true, 1),
+            new Candidate("cand2", "cand2", null, null, null, null, true, Integer.MAX_VALUE),
+            new Candidate("cand3", "cand3", null, null, null, null, true, Integer.MIN_VALUE)
+        );
+        Collections.sort(candidates);
+
+        assertEquals("cand3", candidates.get(0).value());
+        assertEquals("cand1", candidates.get(1).value());
+        assertEquals("cand2", candidates.get(2).value());
+    }
+}

reader/src/test/java/org/jline/reader/LineReaderBuilderTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 20021, the original author or authors.
+ * Copyright (c) 2021, 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.