SF patch #440170: Tests for fileinput module.

New test_fileinput.py from Nick Mathewson, fiddled to use TESTFN and sundry
style nits.

1 files changed, 159 insertions, 0 deletions

diff --git a/Lib/test/test_fileinput.py b/Lib/test/test_fileinput.py
new file mode 100644
index 0000000..fe90860
--- /dev/null
+++ b/Lib/test/test_fileinput.py
@@ -0,0 +1,159 @@
+'''
+Tests for fileinput module.
+Nick Mathewson
+'''
+
+from test_support import verify, verbose, TESTFN
+import sys, os, re
+from StringIO import StringIO
+from fileinput import FileInput
+
+# 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):
+    name = TESTFN + str(i)
+    f = open(name, 'w')
+    f.writelines(lines)
+    f.close()
+    return name
+
+pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
+
+def remove_tempfiles(*names):
+    for name in names:
+        try:
+            os.unlink(name)
+        except:
+            pass
+
+def runTests(t1, t2, t3, t4, bs=0, round=0):
+    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()
+    verify(len(lines) == 31)
+    verify(lines[4] == 'Line 5 of file 1\n')
+    verify(lines[30] == 'Line 1 of file 4\n')
+    verify(fi.lineno() == 31)
+    verify(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()
+    verify(fi.filename() == t2)
+    verify(fi.lineno() == 21)
+    verify(fi.filelineno() == 6)
+    verify(not fi.isfirstline())
+    verify(not fi.isstdin())
+
+    if verbose:
+        print '%s. Nextfile (bs=%s)' % (start+2, bs)
+    fi.nextfile()
+    verify(fi.readline() == 'Line 1 of file 3\n')
+    verify(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)
+        verify(len(lines) == 33)
+        verify(lines[32] == 'Line 2 of stdin\n')
+        verify(fi.filename() == '<stdin>')
+        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)
+    verify(fi.lineno() == 0)
+    verify(fi.filename() == None)
+    fi.nextfile()
+    verify(fi.lineno() == 0)
+    verify(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:
+        verify(line[-1] == '\n')
+        m = pat.match(line[:-1])
+        verify(m != None)
+        verify(int(m.group(1)) == fi.filelineno())
+    fi.close()
+
+
+def writeFiles():
+    global t1, t2, t3, t4
+    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)])
+
+# First, run the tests with default and teeny buffer size.
+for round, bs in (0, 0), (1, 30):
+    try:
+        writeFiles()
+        runTests(t1, t2, t3, t4, bs, round)
+    finally:
+        remove_tempfiles(t1, t2, t3, t4)
+
+# Next, check for proper behavior with 0-byte files.
+if verbose:
+    print "13. 0-byte files"
+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()
+    verify(line == 'The only line there is.\n')
+    verify(fi.lineno() == 1)
+    verify(fi.filelineno() == 1)
+    verify(fi.filename() == t3)
+    line = fi.readline()
+    verify(not line)
+    verify(fi.lineno() == 1)
+    verify(fi.filelineno() == 0)
+    verify(fi.filename() == t4)
+    fi.close()
+finally:
+    remove_tempfiles(t1, t2, t3, t4)
+
+if verbose:
+    print "14. Files that don't end with newline"
+try:
+    t1 = writeTmp(1, ["A\nB\nC"])
+    t2 = writeTmp(2, ["D\nE\nF"])
+    fi = FileInput(files=(t1, t2))
+    lines = list(fi)
+    verify(lines == ["A\n", "B\n", "C", "D\n", "E\n", "F"])
+    verify(fi.filelineno() == 3)
+    verify(fi.lineno() == 6)
+finally:
+    remove_tempfiles(t1, t2)