''' Tests for fileinput module. Nick Mathewson ''' import unittest from test.test_support import verbose, TESTFN, run_unittest from test.test_support import unlink as safe_unlink import sys, os, re from StringIO import StringIO from fileinput import FileInput, hook_encoded # The fileinput module has 2 interfaces: the FileInput class which does # all the work, and a few functions (input, etc.) that use a global _state # variable. We only test the FileInput class, since the other functions # only provide a thin facade over FileInput. # Write lines (a list of lines) to temp file number i, and return the # temp file's name. def writeTmp(i, lines, mode='w'): # opening in text mode is the default name = TESTFN + str(i) f = open(name, mode) f.writelines(lines) f.close() return name def remove_tempfiles(*names): for name in names: safe_unlink(name) class BufferSizesTests(unittest.TestCase): def test_buffer_sizes(self): # First, run the tests with default and teeny buffer size. for round, bs in (0, 0), (1, 30): try: t1 = writeTmp(1, ["Line %s of file 1\n" % (i+1) for i in range(15)]) t2 = writeTmp(2, ["Line %s of file 2\n" % (i+1) for i in range(10)]) t3 = writeTmp(3, ["Line %s of file 3\n" % (i+1) for i in range(5)]) t4 = writeTmp(4, ["Line %s of file 4\n" % (i+1) for i in range(1)]) self.buffer_size_test(t1, t2, t3, t4, bs, round) finally: remove_tempfiles(t1, t2, t3, t4) def buffer_size_test(self, t1, t2, t3, t4, bs=0, round=0): pat = re.compile(r'LINE (\d+) OF FILE (\d+)') start = 1 + round*6 if verbose: print('%s. Simple iteration (bs=%s)' % (start+0, bs)) fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs) lines = list(fi) fi.close() self.assertEqual(len(lines), 31) self.assertEqual(lines[4], 'Line 5 of file 1\n') self.assertEqual(lines[30], 'Line 1 of file 4\n') self.assertEqual(fi.lineno(), 31) self.assertEqual(fi.filename(), t4) if verbose: print('%s. Status variables (bs=%s)' % (start+1, bs)) fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs) s = "x" while s and s != 'Line 6 of file 2\n': s = fi.readline() self.assertEqual(fi.filename(), t2) self.assertEqual(fi.lineno(), 21) self.assertEqual(fi.filelineno(), 6) self.failIf(fi.isfirstline()) self.failIf(fi.isstdin()) if verbose: print('%s. Nextfile (bs=%s)' % (start+2, bs)) fi.nextfile() self.assertEqual(fi.readline(), 'Line 1 of file 3\n') self.assertEqual(fi.lineno(), 22) fi.close() if verbose: print('%s. Stdin (bs=%s)' % (start+3, bs)) fi = FileInput(files=(t1, t2, t3, t4, '-'), bufsize=bs) savestdin = sys.stdin try: sys.stdin = StringIO("Line 1 of stdin\nLine 2 of stdin\n") lines = list(fi) self.assertEqual(len(lines), 33) self.assertEqual(lines[32], 'Line 2 of stdin\n') self.assertEqual(fi.filename(), '') fi.nextfile() finally: sys.stdin = savestdin if verbose: print('%s. Boundary conditions (bs=%s)' % (start+4, bs)) fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs) self.assertEqual(fi.lineno(), 0) self.assertEqual(fi.filename(), None) fi.nextfile() self.assertEqual(fi.lineno(), 0) self.assertEqual(fi.filename(), None) if verbose: print('%s. Inplace (bs=%s)' % (start+5, bs)) savestdout = sys.stdout try: fi = FileInput(files=(t1, t2, t3, t4), inplace=1, bufsize=bs) for line in fi: line = line[:-1].upper() print(line) fi.close() finally: sys.stdout = savestdout fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs) for line in fi: self.assertEqual(line[-1], '\n') m = pat.match(line[:-1]) self.assertNotEqual(m, None) self.assertEqual(int(m.group(1)), fi.filelineno()) fi.close() class FileInputTests(unittest.TestCase): def test_zero_byte_files(self): try: t1 = writeTmp(1, [""]) t2 = writeTmp(2, [""]) t3 = writeTmp(3, ["The only line there is.\n"]) t4 = writeTmp(4, [""]) fi = FileInput(files=(t1, t2, t3, t4)) line = fi.readline() self.assertEqual(line, 'The only line there is.\n') self.assertEqual(fi.lineno(), 1) self.assertEqual(fi.filelineno(), 1) self.assertEqual(fi.filename(), t3) line = fi.readline() self.failIf(line) self.assertEqual(fi.lineno(), 1) self.assertEqual(fi.filelineno(), 0) self.assertEqual(fi.filename(), t4) fi.close() finally: remove_tempfiles(t1, t2, t3, t4) def test_files_that_dont_end_with_newline(self): try: t1 = writeTmp(1, ["A\nB\nC"]) t2 = writeTmp(2, ["D\nE\nF"]) fi = FileInput(files=(t1, t2)) lines = list(fi) self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"]) self.assertEqual(fi.filelineno(), 3) self.assertEqual(fi.lineno(), 6) finally: remove_tempfiles(t1, t2) def test_unicode_filenames(self): try: t1 = writeTmp(1, ["A\nB"]) encoding = sys.getfilesystemencoding() if encoding is None: encoding = 'ascii' fi = FileInput(files=unicode(t1, encoding)) lines = list(fi) self.assertEqual(lines, ["A\n", "B"]) finally: remove_tempfiles(t1) def test_fileno(self): try: t1 = writeTmp(1, ["A\nB"]) t2 = writeTmp(2, ["C\nD"]) fi = FileInput(files=(t1, t2)) self.assertEqual(fi.fileno(), -1) line =next( fi) self.assertNotEqual(fi.fileno(), -1) fi.nextfile() self.assertEqual(fi.fileno(), -1) line = list(fi) self.assertEqual(fi.fileno(), -1) finally: remove_tempfiles(t1, t2) def test_opening_mode(self): try: # invalid mode, should raise ValueError fi = FileInput(mode="w") self.fail("FileInput should reject invalid mode argument") except ValueError: pass try: # try opening in universal newline mode t1 = writeTmp(1, ["A\nB\r\nC\rD"], mode="wb") fi = FileInput(files=t1, mode="U") lines = list(fi) self.assertEqual(lines, ["A\n", "B\n", "C\n", "D"]) finally: remove_tempfiles(t1) def test_file_opening_hook(self): try: # cannot use openhook and inplace mode fi = FileInput(inplace=1, openhook=lambda f, m: None) self.fail("FileInput should raise if both inplace " "and openhook arguments are given") except ValueError: pass try: fi = FileInput(openhook=1) self.fail("FileInput should check openhook for being callable") except ValueError: pass try: t1 = writeTmp(1, ["A\nB"], mode="wb") fi = FileInput(files=t1, openhook=hook_encoded("rot13")) lines = list(fi) self.assertEqual(lines, ["N\n", "O"]) finally: remove_tempfiles(t1) def test_main(): run_unittest(BufferSizesTests, FileInputTests) if __name__ == "__main__": test_main()