added some simple tests for afmLib

Tests/afmLib/afmLib_test.py

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+from __future__ import print_function, division, absolute_import
+from fontTools.misc.py23 import *
+import unittest
+import os
+from fontTools import afmLib
+
+
+CWD = os.path.abspath(os.path.dirname(__file__))
+DATADIR = os.path.join(CWD, 'data')
+AFM = os.path.join(DATADIR, 'TestAFM.afm')
+
+
+class AFMTest(unittest.TestCase):
+
+	def test_read_afm(self):
+		afm = afmLib.AFM(AFM)
+		self.assertEqual(sorted(afm.kernpairs()), 
+			sorted([('V', 'A'), ('T', 'comma'), ('V', 'd'), ('T', 'c'), ('T', 'period')]))
+		self.assertEqual(afm['V', 'A'], -60)
+		self.assertEqual(afm['V', 'd'], 30)
+		self.assertEqual(afm['A'], (65, 668, (8, -25, 660, 666)))
+
+	def test_write_afm(self):
+		afm = afmLib.AFM(AFM)
+		newAfm, afmData = self.write(afm)
+		self.assertEqual(afm.kernpairs(), newAfm.kernpairs())
+		self.assertEqual(afm.chars(), newAfm.chars())
+		self.assertEqual(afm.comments(), newAfm.comments()[1:])  # skip the "generated by afmLib" comment
+		for pair in afm.kernpairs():
+			self.assertEqual(afm[pair], newAfm[pair])
+		for char in afm.chars():
+			self.assertEqual(afm[char], newAfm[char])
+		with open(AFM, 'r') as f:
+			originalLines = f.read().splitlines()
+		newLines = afmData.splitlines()
+		del newLines[1]  # remove the
+		self.assertEqual(originalLines, newLines)
+
+	@staticmethod
+	def write(afm, sep='\r'):
+		temp = os.path.join(DATADIR, 'temp.afm')
+		try:
+			afm.write(temp, sep)
+			with open(temp, 'r') as f:
+				afmData = f.read()
+			afm = afmLib.AFM(temp)
+		finally:
+			if os.path.exists(temp):
+				os.remove(temp)
+		return afm, afmData
+
+
+if __name__ == '__main__':
+	import sys
+	sys.exit(unittest.main())

Tests/afmLib/data/TestAFM.afm

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+StartFontMetrics 2.0
+Comment UniqueID 2123703
+Comment Panose 2 0 6 3 3 0 0 2 0 4
+FontName TestFont-Regular
+FullName TestFont-Regular
+FamilyName TestFont
+Weight Regular
+ItalicAngle 0.00
+IsFixedPitch false
+FontBBox -94 -317 1316 1009
+UnderlinePosition -296
+UnderlineThickness 111
+Version 001.000
+Notice [c] Copyright 2017. All Rights Reserved.
+EncodingScheme FontSpecific
+CapHeight 700
+XHeight 500
+Ascender 750
+Descender -250
+StdHW 181
+StdVW 194
+StartCharMetrics 4
+C 32 ; WX 200 ; N space ; B 0 0 0 0 ;
+C 65 ; WX 668 ; N A ; B 8 -25 660 666 ;
+C 66 ; WX 543 ; N B ; B 36 0 522 666 ;
+C 67 ; WX 582 ; N C ; B 24 -21 564 687 ;
+EndCharMetrics
+StartKernData
+StartKernPairs 5
+KPX T c 30
+KPX T comma -100
+KPX T period -100
+KPX V A -60
+KPX V d 30
+EndKernPairs
+EndKernData
+EndFontMetrics