added missing tests for Bug 55042: patch for missing function COMPLEX

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1488808 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/ss/formula/atp/AnalysisToolPak.java

 import org.apache.poi.ss.formula.eval.ValueEval;
 import org.apache.poi.ss.formula.function.FunctionMetadata;
 import org.apache.poi.ss.formula.function.FunctionMetadataRegistry;
-import org.apache.poi.ss.formula.functions.EDate;
-import org.apache.poi.ss.formula.functions.FreeRefFunction;
-import org.apache.poi.ss.formula.functions.Sumifs;
+import org.apache.poi.ss.formula.functions.*;
 import org.apache.poi.ss.formula.udf.UDFFinder;
 
 import java.util.*;
         r(m, "BIN2DEC", null);
         r(m, "BIN2HEX", null);
         r(m, "BIN2OCT", null);
-        r(m, "COMPLEX", null);
+        r(m, "COMPLEX", Complex.instance);
         r(m, "CONVERT", null);
         r(m, "COUNTIFS", null);
         r(m, "COUPDAYBS", null);

src/java/org/apache/poi/ss/formula/functions/Complex.java

 package org.apache.poi.ss.formula.functions;
 
+import org.apache.poi.ss.formula.OperationEvaluationContext;
 import org.apache.poi.ss.formula.eval.*;
 
 /**
  *
  * @author cedric dot walter @ gmail dot com
  */
-public class Complex extends Var2or3ArgFunction {
+public class Complex extends Var2or3ArgFunction implements FreeRefFunction {
+
+    public static final FreeRefFunction instance = new Complex();
 
     public static final String DEFAULT_SUFFIX = "i";
     public static final String SUPPORTED_SUFFIX = "j";
         return (number == Math.floor(number)) && !Double.isInfinite(number);
     }
 
+    @Override
+    public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
+        if (args.length == 2) {
+            return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0], args[1]);
+        }
+        if (args.length == 3) {
+            return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0], args[1], args[2]);
+        }
+
+        return ErrorEval.VALUE_INVALID;
+    }
 }