Added 4 tests in Arith.test.in.

test/Arith.test.in

 #! @BASH@
 #
-echo 1..8 # Number of tests to be executed.
+echo 1..12 # Number of tests to be executed.
 #
 . ./cdoTestFunctions.test
 #
@@ -28,7 +28,7 @@ for OPERATOR in $OPERATORS; do
     fi
     let NTEST+=1
 done
-
+#
 for OPERATOR in $OPERATORS; do
     if [ -z "$1" ] || [ $NTEST == $1 ]; then
         # expr,instr var
@@ -57,4 +57,21 @@ for OPERATOR in $OPERATORS; do
     let NTEST+=1
 done
 #
+for OPERATOR in $OPERATORS; do
+    if [ -z "$1" ] || [ $NTEST == $1 ]; then
+        IFILE1=$DATAPATH/arith2.srv
+        IFILE2=$DATAPATH/arith2mean.srv
+        OFILE=arith2${OPERATOR}_res
+        RFILE=$DATAPATH/arith2${OPERATOR}_ref
+
+        CDOTEST="$OPERATOR"
+        CDOCOMMAND="$CDO  $FORMAT ${OPERATOR} $IFILE1 $IFILE2 $OFILE"
+        TESTCOMMAND="$CDO  diff $OFILE $RFILE"
+
+        runTest
+        rm -f $OFILE
+    fi
+    let NTEST+=1
+done
+#
 exit 0

test/data/Makefile.am

@@ -89,7 +89,7 @@ DETREND      = detrend_ref
 EXPR         = expr1_ref aexpr1_ref expr2_ref aexpr2_ref expr3_ref aexpr3_ref
 THREAD       = thread1_ref tsformat1_ref
 GRADSDES     = pl_data.ctl pl_data.gmp
-ARITH        = arithadd_ref arithsub_ref arithmul_ref arithdiv_ref
+ARITH        = arithadd_ref arithsub_ref arithmul_ref arithdiv_ref arith2.srv arith2mean.srv arith2add_ref arith2sub_ref arith2mul_ref arith2div_ref
 MONARITH     = monadd_ref monsub_ref monmul_ref mondiv_ref
 YEARARITH    = yearadd_ref yearsub_ref yearmul_ref yeardiv_ref
 YMONARITH    = ymonadd_ref ymonsub_ref ymonmul_ref ymondiv_ref