bug 59858: describe why VBA macro reading failed

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1752778 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/poifs/macros/VBAMacroReader.java

@@ -218,6 +218,10 @@ public class VBAMacroReader implements Closeable {
             modules.put(name, module);
             module.read(dis);
         } else {
+            if (module.offset == null) {
+                //This should not happen. bug 59858
+                throw new IOException("Module offset for '" + name + "' was never read.");
+            }
             // we know the offset already, so decompress immediately on-the-fly
             long skippedBytes = dis.skip(module.offset);
             if (skippedBytes != module.offset) {

src/testcases/org/apache/poi/poifs/macros/TestVBAMacroReader.java

@@ -269,10 +269,15 @@ public class TestVBAMacroReader {
         try {
             fromFile(POIDataSamples.getSpreadSheetInstance(), "59858.xls");
             fail("This test passes now. Please update the unit test and bug 59858.");
-        } catch (NullPointerException e) {
-            e.printStackTrace();
-            // NPE when reading module.offset in VBAMacroReader.readMacros (approx line 258)
-            assumeTrue("This test currently fails with an NPE. See stdout.", false);
+        } catch (IOException e) {
+            if (e.getMessage().matches("Module offset for '.+' was never read.")) {
+                //e.printStackTrace();
+                // NPE when reading module.offset in VBAMacroReader.readMacros (approx line 258)
+                assumeTrue("This test currently fails. See stdout.", false);
+            } else {
+                // something unexpected failed
+                throw e;
+            }
         }
     }
 }