Add worlddump unit test

Add a worlddump unit test to avoid simple breakages

Change-Id: I6b87d4dbe22da2c1ca5ceb13134e9bb570f5cef2

tests/test_worlddump.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# Simple test of worlddump.py
+
+TOP=$(cd $(dirname "$0")/.. && pwd)
+
+source $TOP/tests/unittest.sh
+
+OUT_DIR=$(mktemp -d)
+
+$TOP/tools/worlddump.py -d $OUT_DIR
+
+if [[ $? -ne 0 ]]; then
+    fail "worlddump failed"
+else
+
+    # worlddump creates just one output file
+    OUT_FILE=($OUT_DIR/*.txt)
+
+    if [ ! -r $OUT_FILE ]; then
+        failed "worlddump output not seen"
+    else
+        passed "worlddump output $OUT_FILE"
+
+        if [[ $(stat -c %s $OUT_DIR/*.txt) -gt 0 ]]; then
+            passed "worlddump output is not zero sized"
+        fi
+
+        # put more extensive examination here, if required.
+    fi
+fi
+
+rm -rf $OUT_DIR
+
+report_results