Java: add tests

java/ql/test/library-tests/neutrals/neutralsinks/NeutralSinksTest.ql

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+import java
+import TestUtilities.InlineExpectationsTest
+import semmle.code.java.dataflow.DataFlow
+import semmle.code.java.dataflow.ExternalFlow
+
+class NeutralSinksTest extends InlineExpectationsTest {
+  NeutralSinksTest() { this = "NeutralSinksTest" }
+
+  override string getARelevantTag() { result = "isSink" }
+
+  override predicate hasActualResult(Location location, string element, string tag, string value) {
+    tag = "isSink" and
+    exists(DataFlow::Node sink |
+      sinkNode(sink, _) and
+      sink.getLocation() = location and
+      element = sink.toString() and
+      value = ""
+    )
+  }
+}

java/ql/test/library-tests/neutrals/neutralsinks/Test.java

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+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.spi.FileSystemProvider;
+import java.nio.file.LinkOption;
+import java.text.Collator;
+import java.text.RuleBasedCollator;
+import java.util.prefs.AbstractPreferences;
+import java.util.prefs.Preferences;
+import org.apache.hc.client5.http.protocol.RedirectLocations;
+
+public class Test {
+
+    public void test() throws Exception {
+
+        // java.io
+        File file = null;
+        file.exists(); // Neutral Sink
+        file.compareTo(null); // Neutral Sink
+
+        // java.nio.file
+        Files.exists(null, (LinkOption[])null); // Neutral Sink
+        Files.getLastModifiedTime(null, (LinkOption[])null); // Neutral Sink
+        Files.getOwner(null, (LinkOption[])null); // Neutral Sink
+        Files.getPosixFilePermissions(null, (LinkOption[])null); // Neutral Sink
+        Files.isDirectory(null, (LinkOption[])null); // Neutral Sink
+        Files.isExecutable(null); // Neutral Sink
+        Files.isHidden(null); // Neutral Sink
+        Files.isReadable(null); // Neutral Sink
+        Files.isRegularFile(null, (LinkOption[])null); // Neutral Sink
+        Files.isSameFile(null, null); // Neutral Sink
+        Files.isSymbolicLink(null); // Neutral Sink
+        Files.isWritable(null); // Neutral Sink
+        Files.notExists(null, (LinkOption[])null); // Neutral Sink
+        Files.setLastModifiedTime(null, null); // Neutral Sink
+        Files.size(null); // Neutral Sink
+
+        // java.nio.file.spi
+        FileSystemProvider fsp = null;
+        fsp.isHidden(null); // Neutral Sink
+        fsp.isSameFile(null, null); // Neutral Sink
+
+        // java.text
+        Collator c = null;
+        c.compare(null, null); // Neutral Sink
+        c.equals(null); // Neutral Sink
+        c.equals(null, null); // Neutral Sink
+        RuleBasedCollator rbc = null;
+        rbc.compare(null, null); // Neutral Sink
+
+        // java.util.prefs
+        AbstractPreferences ap = null;
+        ap.nodeExists(null); // Neutral Sink
+        Preferences p = null;
+        p.nodeExists(null); // Neutral Sink
+
+        // org.apache.hc.client5.http.protocol
+        RedirectLocations rl = null;
+        rl.contains(null); // Neutral Sink
+    }
+
+}

java/ql/test/library-tests/neutrals/neutralsinks/options

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+//semmle-extractor-options: --javac-args -source 11 -target 11 -cp ${testdir}/../../../stubs/apache-http-5