diff --git a/ycmd/tests/java/testdata/extra_confs/simple_extra_conf_project/src/SignatureHelp.java b/ycmd/tests/java/testdata/extra_confs/simple_extra_conf_project/src/SignatureHelp.java
index 0a3b65a200..6c041cedd3 100644
--- a/ycmd/tests/java/testdata/extra_confs/simple_extra_conf_project/src/SignatureHelp.java
+++ b/ycmd/tests/java/testdata/extra_confs/simple_extra_conf_project/src/SignatureHelp.java
@@ -1,11 +1,20 @@
-import java.util.function.Function;
 
 public class SignatureHelp
 {
   public SignatureHelp( String signature ) {
-    this.test( "")
+    this.test( "test", "t" );
+    this.test( 1, "2" );
+    char [] data = new char[10];
+    String.copyValueOf( data, 1, 2 );
+    this.unique( 10.0 );
+    String s = new String( data );
   }
 
-  public void test( String s, String s ) {
+  public void test( String s, String s1 ) {
+    String.copyValueOf( 
   }
+  public void test( int i, String s ) {
+    SignatureHelp s = new SignatureHelp(
+  }
+  public void unique( double d ) {}
 }