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diff --git a/octave_packages/io-1.0.19/io_xls_testscript.m b/octave_packages/io-1.0.19/io_xls_testscript.m
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+## Copyright (C) 2012 Philip Nienhuis <pr.nienhuis at users.sf.net>
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 3 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+## (Internal function) Check proper operation of XLS spreadsheet scripts.
+## Before running, a character variable 'intf' should be initialized with
+## a value of 'com', 'poi', 'jxl', 'oxs', or 'uno'.
+
+## Author: Philip Nienhuis
+## Created: 2012-02-25
+## Updates:
+## 2012-06-06 Adapted to COM implementation for "formulas_as_text" option
+
+
+printf ("\nTesting .xls interface %s ...\n", intf);
+
+if (strcmp (lower (intf), 'oxs')); 
+  printf ("OXS interface has no write support enabled - writing is done with POI.\n");
+  intf2 = 'com'; 
+else; 
+  intf2 = intf; 
+endif
+
+## 1. Initialize test arrays
+printf ("\n 1. Initialize arrays.\n");
+arr1 = [ 1 2; 3 4.5];
+arr2 = {'r1c1', '=c2+d2'; '', 'r2c2'; true, -83.4};
+opts = struct ("formulas_as_text", 0);
+
+## 2. Insert empty sheet
+printf ("\n 2. Insert first empty sheet.\n");
+xlswrite ('io-test.xls', {''}, 'EmptySheet', 'b4', intf2);
+
+## 3. Add data to test sheet
+printf ("\n 3. Add data to test sheet.\n");
+xlswrite ('io-test.xls', arr1, 'Testsheet', 'c2:d3', intf2);
+xlswrite ('io-test.xls', arr2, 'Testsheet', 'd4:z20', intf2);
+
+## 4. Insert another sheet
+printf ("\n 4. Add another sheet with just one number in A1.\n");
+xlswrite ('io-test.xls', [1], 'JustOne', 'A1', intf2);
+
+## 5. Get sheet info & find sheet with data and data range
+printf ("\n 5. Explore sheet info.\n");
+[~, shts] = xlsfinfo ('io-test.xls', intf);
+shnr = strmatch ('Testsheet', shts(:, 1));                      # Note case!
+crange = shts{shnr, 2};
+
+## 6. Read data back
+printf ("\n 6. Read data back.\n");
+[num, txt, raw, lims] = xlsread ('io-test.xls', shnr, crange, intf);
+
+## 7. Here come the tests, part 1
+printf ("\n 7. Tests part 1 (basic I/O):\n");
+try
+  printf ("    ...Numeric array... ");
+  assert (num(1:2, 1:3), [1, 2, NaN; 3, 4.5, NaN], 1e-10);
+  assert (num(4:5, 1:3), [NaN, NaN, NaN; NaN, 1, -83.4], 1e-10);
+  assert (num(3, 1:2), [NaN, NaN], 1e-10);
+  # Just check if it's numeric, the value depends too much on cached results
+  assert (isnumeric (num(3,3)), true);
+  printf ("matches...\n");
+catch
+  printf ("Hmmm.... error, see 'num'\n"); keyboard
+end_try_catch
+try
+  printf ("    ...Cellstr array... ");
+  assert (txt{1, 1}, 'r1c1');
+  assert (txt{2, 2}, 'r2c2');
+  printf ("matches...\n");
+catch
+  printf ("Hmmm.... error, see 'txt'\n"); keyboard
+end_try_catch
+try
+  printf ("    ...Boolean... ");
+  assert (islogical (raw{5, 2}), true);                         # Fails on COM
+  printf ("recovered...\n");
+catch
+  if (isnumeric (raw{5, 2}))
+    printf ("returned as numeric '1' rather than logical TRUE.\n");
+  else
+    printf ("Hmmm.... error, see 'raw{5, 2}'\n"); keyboard
+  endif
+end_try_catch
+
+## Check if "formulas_as_text" option works:
+printf ("\n 8. Repeat reading, now return formulas as text\n");
+opts.formulas_as_text = 1;
+xls = xlsopen ('io-test.xls', 0, intf);
+raw = xls2oct (xls, shnr, crange, opts);
+xls = xlsclose (xls);
+
+## 9. Here come the tests, part 2.
+printf ("\n 9. Tests part 2 (read back formula):\n");
+
+try
+  # Just check if it contains any string
+  assert ( (ischar (raw{3, 3}) && ~isempty (raw(3, 3)) && raw{3, 3}(1) == "="), true); 
+  printf ("    ...OK, formula recovered ('%s').\n", raw{3, 3});
+catch
+  printf ("Hmmm.... error, see 'raw(3, 3)'");
+  if (isnumeric (raw{3, 3}))
+    printf (" (equals %f, should be a string like '=c2+d2')\n", raw{3, 3}); 
+  else
+    printf ("\n");
+  endif
+end_try_catch
+
+## 10. Clean up
+printf ("\n10. Cleaning up.....");
+delete 'io-test.xls';
+clear arr1 arr2 xls num txt raw lims opts shnr shts crange intf2;
+printf (" OK\n");