def test_superscript(self):
sup = eTree.SubElement(self.row, 'msup')
mi = eTree.SubElement(sup, 'mi')
mi.text = 'a'
mi = eTree.SubElement(sup, 'mi')
mi.text = 'b'
self.assertEqual(eTree.tostring(self.math), converter.convert('a^b'))
def test_array_with_horizontal_lines(self):
table = eTree.SubElement(self.row, 'mtable', rowlines="none solid")
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '1'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '2'
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '3'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '4'
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '5'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '6'
self.assertEqual(eTree.tostring(self.math),
converter.convert(r'\begin{array}{cr} 1 & 2 \\ 3 & 4 \\ \hline 5 & 6 \end{array}'''))
def test_square_root(math_and_row):
math, row = math_and_row
sqrt = eTree.SubElement(row, 'msqrt')
row = eTree.SubElement(sqrt, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
assert _convert(math) == convert(r'\sqrt{2}')
def test_numbers_and_identifiers(math_and_row):
math, row = math_and_row
mn = eTree.SubElement(row, 'mn')
mn.text = '12'
mi = eTree.SubElement(row, 'mi')
mi.text = 'x'
assert _convert(math) == convert('12x')
def test_array_with_vertical_bars(math_and_row):
math, row = math_and_row
table = eTree.SubElement(row, 'mtable', columnlines='solid none')
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '1'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '2'
td = eTree.SubElement(tr, 'mtd', columnalign='left')
mn = eTree.SubElement(td, 'mn')
mn.text = '3'
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '4'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '5'
td = eTree.SubElement(tr, 'mtd', columnalign='left')
mn = eTree.SubElement(td, 'mn')
mn.text = '6'
assert _convert(math) == convert(
r'\begin{array}{c|rl} 1 & 2 & 3 \\ 4 & 5 & 6 \end{array}')
def test_pmatrix(math_and_row):
math, row = math_and_row
mo = eTree.SubElement(row, 'mo')
mo.text = '('
table = eTree.SubElement(row, 'mtable')
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd')
mi = eTree.SubElement(td, 'mi')
mi.text = 'a'
td = eTree.SubElement(tr, 'mtd')
mi = eTree.SubElement(td, 'mi')
mi.text = 'b'
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd')
mi = eTree.SubElement(td, 'mi')
mi.text = 'c'
td = eTree.SubElement(tr, 'mtd')
mi = eTree.SubElement(td, 'mi')
mi.text = 'd'
mo = eTree.SubElement(row, 'mo')
mo.text = ')'
assert _convert(math) == convert(
r'\begin{pmatrix}a & b \\ c & d \end{pmatrix}')
def test_array_with_horizontal_lines(math_and_row):
math, row = math_and_row
table = eTree.SubElement(row, 'mtable', rowlines='none solid')
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '1'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '2'
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '3'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '4'
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '5'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '6'
s = r'\begin{array}{cr} 1 & 2 \\ 3 & 4 \\ \hline 5 & 6 \end{array}'
assert _convert(math) == convert(s)
def test_issue_42(math_and_row):
math, row = math_and_row
msqrt = eTree.SubElement(row, 'msqrt')
mrow = eTree.SubElement(msqrt, 'mrow')
mo = eTree.SubElement(mrow, 'mo')
mo.text = '('
mo = eTree.SubElement(mrow, 'mo')
mo.text = '−'
mn = eTree.SubElement(mrow, 'mn')
mn.text = '25'
msup = eTree.SubElement(mrow, 'msup')
mo = eTree.SubElement(msup, 'mo')
mo.text = ')'
mrow2 = eTree.SubElement(msup, 'mrow')
mn = eTree.SubElement(mrow2, 'mn')
mn.text = '2'
mo = eTree.SubElement(row, 'mo')
mo.text = '='
mi = eTree.SubElement(row, 'mi')
mi.text = '±'
mn = eTree.SubElement(row, 'mn')
mn.text = '25'
assert _convert(math) == convert(r'\sqrt { ( - 25 ) ^ { 2 } } = \pm 25')
def test_array_with_vertical_bars(self):
table = eTree.SubElement(self.row, 'mtable', columnlines='solid none')
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '1'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '2'
td = eTree.SubElement(tr, 'mtd', columnalign='left')
mn = eTree.SubElement(td, 'mn')
mn.text = '3'
tr = eTree.SubElement(table, 'mtr')
td = eTree.SubElement(tr, 'mtd', columnalign='center')
mn = eTree.SubElement(td, 'mn')
mn.text = '4'
td = eTree.SubElement(tr, 'mtd', columnalign='right')
mn = eTree.SubElement(td, 'mn')
mn.text = '5'
td = eTree.SubElement(tr, 'mtd', columnalign='left')
mn = eTree.SubElement(td, 'mn')
mn.text = '6'
self.assertEqual(eTree.tostring(self.math),
converter.convert(r'\begin{array}{c|rl} 1 & 2 & 3 \\ 4 & 5 & 6 \end{array}'''))
def test_binomial(self):
self.row.append_child('mo', '(')
frac = self.row.append_child('mfrac', None, linethickness=0)
frac.append_child('mrow').append_child('mn', 2)
frac.append_child('mrow').append_child('mn', 3)
self.row.append_child('mo', ')')
self.assertEqual(str(self.math), converter.convert(r'\binom{2}{3}'))
def test_multiple_identifiers(self):
mi = eTree.SubElement(self.row, 'mi')
mi.text = 'x'
mi = eTree.SubElement(self.row, 'mi')
mi.text = 'y'
mi = eTree.SubElement(self.row, 'mi')
mi.text = 'z'
self.assertEqual(eTree.tostring(self.math), converter.convert('xyz'))
def test_numbers_and_operators(self):
mn = eTree.SubElement(self.row, 'mn')
mn.text = '3'
mo = eTree.SubElement(self.row, 'mo')
mo.text = '−'
mn = eTree.SubElement(self.row, 'mn')
mn.text = '2'
self.assertEqual(eTree.tostring(self.math), converter.convert('3-2'))
def test_superscript(math_and_row):
math, row = math_and_row
sup = eTree.SubElement(row, 'msup')
mi = eTree.SubElement(sup, 'mi')
mi.text = 'a'
mi = eTree.SubElement(sup, 'mi')
mi.text = 'b'
assert _convert(math) == convert('a^b')
def test_superscript_within_curly_braces(self):
row = eTree.SubElement(self.row, 'mrow')
sup = eTree.SubElement(row, 'msup')
mi = eTree.SubElement(sup, 'mi')
mi.text = 'a'
mi = eTree.SubElement(sup, 'mi')
mi.text = 'b'
self.assertEqual(eTree.tostring(self.math), converter.convert('{a^b}'))
def test_left_and_right(self):
mo = eTree.SubElement(self.row, 'mo', stretchy='true', form='prefix', fence='true')
mo.text = '('
mi = eTree.SubElement(self.row, 'mi')
mi.text = 'x'
mo = eTree.SubElement(self.row, 'mo', stretchy='true', form='postfix', fence='true')
mo.text = ')'
self.assertEqual(eTree.tostring(self.math), converter.convert(r'\left(x\right)'))
def test_underline(self):
under = eTree.SubElement(self.row, 'munder')
mrow = eTree.SubElement(under, 'mrow')
mi = eTree.SubElement(mrow, 'mi')
mi.text = 'a'
mo = eTree.SubElement(under, 'mo', stretchy='true')
mo.text = '̲'
self.assertEqual(eTree.tostring(self.math), converter.convert(r'\underline{a}'))
def test_overline(self):
over = eTree.SubElement(self.row, 'mover')
row = eTree.SubElement(over, 'mrow')
mi = eTree.SubElement(row, 'mi')
mi.text = 'a'
mo = eTree.SubElement(over, 'mo', stretchy='true')
mo.text = '¯'
self.assertEqual(eTree.tostring(self.math), converter.convert(r'\overline{a}'))
def test_issue_45_gt(math_and_row):
math, row = math_and_row
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
mo = eTree.SubElement(row, 'mo')
mo.text = '>'
mn = eTree.SubElement(row, 'mn')
mn.text = '5'
assert _convert(math) == convert('2 > 5')
def test_simple_array(self):
table = self.row.append_child('mtable')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='center').append_child('mn', '1')
tr.append_child('mtd', None, columnalign='right').append_child('mn', '2')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='center').append_child('mn', '3')
tr.append_child('mtd', None, columnalign='right').append_child('mn', '4')
self.assertEqual(str(self.math), converter.convert(r'\begin{array}{cr} 1 & 2 \\ 3 & 4 \end{array}'''))
def test_superscript_with_curly_braces(self):
subsup = self.row.append_child('msubsup')
subsup.append_child('mi', 'a')
subsup.append_child('mn', 3)
row = subsup.append_child('mrow')
row.append_child('mi', 'i')
row.append_child('mo', '+')
row.append_child('mn', 1)
self.assertEqual(str(self.math), converter.convert('a^{i+1}_3'))
def test_matrix(self):
table = self.row.append_child('mtable')
tr = table.append_child('mtr')
tr.append_child('mtd').append_child('mi', 'a')
tr.append_child('mtd').append_child('mi', 'b')
tr = table.append_child('mtr')
tr.append_child('mtd').append_child('mi', 'c')
tr.append_child('mtd').append_child('mi', 'd')
self.assertEqual(str(self.math), converter.convert(r'\begin{matrix}a & b \\ c & d \end{matrix}'))
def test_matrix_with_alignment(self):
table = self.row.append_child('mtable')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='right').append_child('mi', 'a')
tr.append_child('mtd', None, columnalign='right').append_child('mi', 'b')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='right').append_child('mi', 'c')
tr.append_child('mtd', None, columnalign='right').append_child('mi', 'd')
self.assertEqual(str(self.math), converter.convert(r'\begin{matrix*}[r]a & b \\ c & d \end{matrix*}'))
def test_matrix_without_begin_and_end(self): # taken from MathJax
table = self.row.append_child('mtable')
tr = table.append_child('mtr')
tr.append_child('mtd').append_child('mi', 'a')
tr.append_child('mtd').append_child('mi', 'b')
tr = table.append_child('mtr')
tr.append_child('mtd').append_child('mi', 'c')
tr.append_child('mtd').append_child('mi', 'd')
self.assertEqual(str(self.math), converter.convert(r'\matrix{a & b \\ c & d}'))
def test_left_and_right(math_and_row):
math, row = math_and_row
mo = eTree.SubElement(row, 'mo', fence='true', form='prefix', stretchy='true')
mo.text = '('
mi = eTree.SubElement(row, 'mi')
mi.text = 'x'
mo = eTree.SubElement(row, 'mo', fence='true', form='postfix', stretchy='true')
mo.text = ')'
assert _convert(math) == convert(r'\left(x\right)')
def test_superscript_within_curly_braces(math_and_row):
math, row = math_and_row
row = eTree.SubElement(row, 'mrow')
sup = eTree.SubElement(row, 'msup')
mi = eTree.SubElement(sup, 'mi')
mi.text = 'a'
mi = eTree.SubElement(sup, 'mi')
mi.text = 'b'
assert _convert(math) == convert('{a^b}')
def test_multiple_groups(self):
mrow = eTree.SubElement(self.row, 'mrow')
mi = eTree.SubElement(mrow, 'mi')
mi.text = 'a'
mrow = eTree.SubElement(self.row, 'mrow')
mi = eTree.SubElement(mrow, 'mi')
mi.text = 'b'
self.assertEqual(eTree.tostring(self.math),
converter.convert('{a}{b}'))
def test_simple_fraction(self):
frac = eTree.SubElement(self.row, 'mfrac')
row = eTree.SubElement(frac, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '1'
row = eTree.SubElement(frac, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
self.assertEqual(eTree.tostring(self.math), converter.convert(r'\frac{1}{2}'))
def test_overline(math_and_row):
math, row = math_and_row
over = eTree.SubElement(row, 'mover')
row = eTree.SubElement(over, 'mrow')
mi = eTree.SubElement(row, 'mi')
mi.text = 'a'
mo = eTree.SubElement(over, 'mo', stretchy='true')
mo.text = '¯'
assert _convert(math) == convert(r'\overline{a}')
def test_numbers_and_operators(math_and_row):
math, row = math_and_row
mn = eTree.SubElement(row, 'mn')
mn.text = '3'
mo = eTree.SubElement(row, 'mo')
mo.text = '−'
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
assert _convert(math) == convert('3-2')
def test_underline(math_and_row):
math, row = math_and_row
under = eTree.SubElement(row, 'munder')
mrow = eTree.SubElement(under, 'mrow')
mi = eTree.SubElement(mrow, 'mi')
mi.text = 'a'
mo = eTree.SubElement(under, 'mo', stretchy='true')
mo.text = '̲'
assert _convert(math) == convert(r'\underline{a}')
def test_multiple_identifiers(math_and_row):
math, row = math_and_row
mi = eTree.SubElement(row, 'mi')
mi.text = 'x'
mi = eTree.SubElement(row, 'mi')
mi.text = 'y'
mi = eTree.SubElement(row, 'mi')
mi.text = 'z'
assert _convert(math) == convert('xyz')
def test_multiple_groups(math_and_row):
math, row = math_and_row
mrow = eTree.SubElement(row, 'mrow')
mi = eTree.SubElement(mrow, 'mi')
mi.text = 'a'
mrow = eTree.SubElement(row, 'mrow')
mi = eTree.SubElement(mrow, 'mi')
mi.text = 'b'
assert _convert(math) == convert('{a}{b}')
def test_root(self):
root = eTree.SubElement(self.row, 'mroot')
row = eTree.SubElement(root, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
row = eTree.SubElement(root, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '3'
self.assertEqual(eTree.tostring(self.math), converter.convert(r'\sqrt[3]{2}'))
def test_over(math_and_row):
math, row = math_and_row
frac = eTree.SubElement(row, 'mfrac')
row = eTree.SubElement(frac, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '1'
row = eTree.SubElement(frac, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
assert _convert(math) == convert(r'1 \over 2')
def test_root(math_and_row):
math, row = math_and_row
root = eTree.SubElement(row, 'mroot')
row = eTree.SubElement(root, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
row = eTree.SubElement(root, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '3'
assert _convert(math) == convert(r'\sqrt[3]{2}')
def test_simple_fraction(math_and_row):
math, row = math_and_row
frac = eTree.SubElement(row, 'mfrac')
row = eTree.SubElement(frac, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '1'
row = eTree.SubElement(frac, 'mrow')
mn = eTree.SubElement(row, 'mn')
mn.text = '2'
assert _convert(math) == convert(r'\frac{1}{2}')
def test_matrix_with_negative_sign(self):
table = self.row.append_child('mtable')
tr = table.append_child('mtr')
mtd = tr.append_child('mtd')
mtd.append_child('mo', '−')
mtd.append_child('mi', 'a')
tr.append_child('mtd').append_child('mi', 'b')
tr = table.append_child('mtr')
tr.append_child('mtd').append_child('mi', 'c')
tr.append_child('mtd').append_child('mi', 'd')
self.assertEqual(str(self.math), converter.convert(r'\begin{matrix}-a & b \\ c & d \end{matrix}'))
def test_array_with_vertical_bars(self):
table = self.row.append_child('mtable', None, columnlines='solid none')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='center').append_child('mn', '1')
tr.append_child('mtd', None, columnalign='right').append_child('mn', '2')
tr.append_child('mtd', None, columnalign='left').append_child('mn', '3')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='center').append_child('mn', '4')
tr.append_child('mtd', None, columnalign='right').append_child('mn', '5')
tr.append_child('mtd', None, columnalign='left').append_child('mn', '6')
self.assertEqual(str(self.math),
converter.convert(r'\begin{array}{c|rl} 1 & 2 & 3 \\ 4 & 5 & 6 \end{array}'''))
def test_array_with_horizontal_lines(self):
table = self.row.append_child('mtable', None, rowlines="none solid")
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='center').append_child('mn', '1')
tr.append_child('mtd', None, columnalign='right').append_child('mn', '2')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='center').append_child('mn', '3')
tr.append_child('mtd', None, columnalign='right').append_child('mn', '4')
tr = table.append_child('mtr')
tr.append_child('mtd', None, columnalign='center').append_child('mn', '5')
tr.append_child('mtd', None, columnalign='right').append_child('mn', '6')
self.assertEqual(str(self.math),
converter.convert(r'\begin{array}{cr} 1 & 2 \\ 3 & 4 \\ \hline 5 & 6 \end{array}'''))
def test_superscript_within_curly_braces(self):
row = self.row.append_child('mrow')
sup = row.append_child('msup')
sup.append_child('mi', 'a')
sup.append_child('mi', 'b')
self.assertEqual(str(self.math), converter.convert('{a^b}'))
def test_multiple_numbers(self):
self.row.append_child('mn', 333)
self.assertEqual(str(self.math), converter.convert('333'))
def test_space(self):
self.row.append_child('mspace', None, width='0.167em')
self.assertEqual(str(self.math), converter.convert('\,'))
def test_underline(self):
under = self.row.append_child('munder')
under.append_child('mrow').append_child('mi', 'a')
under.append_child('mo', '̲', stretchy='true')
self.assertEqual(str(self.math), converter.convert(r'\underline{a}'))
def test_subscript(self):
sub = self.row.append_child('msub')
sub.append_child('mi', 'a')
sub.append_child('mi', 'b')
self.assertEqual(str(self.math), converter.convert('a_b'))
def test_superscript_and_subscript(self):
subsup = self.row.append_child('msubsup')
subsup.append_child('mi', 'a')
subsup.append_child('mi', 'c')
subsup.append_child('mi', 'b')
self.assertEqual(str(self.math), converter.convert('a^b_c'))
def test_numbers_and_identifiers_and_operators(self):
self.row.append_child('mn', 3)
self.row.append_child('mi', 'x')
self.row.append_child('mo', '*')
self.row.append_child('mn', 2)
self.assertEqual(str(self.math), converter.convert('3x*2'))
def test_inner_group(self):
row = self.row.append_child('mrow')
row.append_child('mi', 'a')
row.append_child('mo', '+')
row.append_child('mrow').append_child('mi', 'b')
self.assertEqual(str(self.math), converter.convert('{a+{b}}'))
def test_multiple_identifiers(self):
self.row.append_child('mi', 'x')
self.row.append_child('mi', 'y')
self.row.append_child('mi', 'z')
self.assertEqual(str(self.math), converter.convert('xyz'))
def test_numbers_and_operators(self):
self.row.append_child('mn', 3)
self.row.append_child('mo', '−')
self.row.append_child('mn', 2)
self.assertEqual(str(self.math), converter.convert('3-2'))
def test_numbers_and_identifiers(self):
self.row.append_child('mn', 12)
self.row.append_child('mi', 'x')
self.assertEqual(str(self.math), converter.convert('12x'))
def test_multiple_groups(self):
self.row.append_child('mrow').append_child('mi', 'a')
self.row.append_child('mrow').append_child('mi', 'b')
self.assertEqual(str(self.math), converter.convert('{a}{b}'))
def test_left_and_right(self):
self.row.append_child('mo', '(', stretchy='true', form='prefix', fence='true')
self.row.append_child('mi', 'x')
self.row.append_child('mo', ')', stretchy='true', form='postfix', fence='true')
self.assertEqual(str(self.math), converter.convert(r'\left(x\right)'))
def test_single_operator(self):
self.row.append_child('mo', '+')
self.assertEqual(str(self.math), converter.convert('+'))
def test_single_number(self):
self.row.append_child('mn', 3)
self.assertEqual(str(self.math), converter.convert('3'))
def test_decimal_numbers(self):
self.row.append_child('mn', 12.34)
self.assertEqual(str(self.math), converter.convert('12.34'))
def test_square_root(self):
sqrt = self.row.append_child('msqrt')
sqrt.append_child('mrow').append_child('mn', 2)
self.assertEqual(str(self.math), converter.convert(r'\sqrt{2}'))
def test_single_group(self):
self.row.append_child('mrow').append_child('mi', 'a')
self.assertEqual(str(self.math), converter.convert('{a}'))
def test_root(self):
root = self.row.append_child('mroot')
root.append_child('mrow').append_child('mn', 2)
root.append_child('mrow').append_child('mn', 3)
self.assertEqual(str(self.math), converter.convert(r'\sqrt[3]{2}'))
def test_overline(self):
over = self.row.append_child('mover')
over.append_child('mrow').append_child('mi', 'a')
over.append_child('mo', '¯', stretchy='true')
self.assertEqual(str(self.math), converter.convert(r'\overline{a}'))
def test_simple_fraction(self):
frac = self.row.append_child('mfrac')
frac.append_child('mrow').append_child('mn', 1)
frac.append_child('mrow').append_child('mn', 2)
self.assertEqual(str(self.math), converter.convert(r'\frac{1}{2}'))