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test_xslsetter

Test the MetadataHandler class.

TestMetadataHandler

Bases: unittest.TestCase

Test the MetadataHandler class.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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class TestMetadataHandler(unittest.TestCase):
    """Test the MetadataHandler class."""

    def test_set_skip_lines1(self):
        """Test a valid skip_pages line."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("skip_lines", "1, 4-5, 7")
        got = md.skip_lines
        want = [1, 4, 5, 7]

        self.assertEqual(got, want)

    def test_set_skip_lines2(self):
        """Test an invalid skip_lines line."""
        md = xslsetter.MetadataHandler("bogus.xml", create=True)
        md.set_variable("skip_lines", "1, 4 5, 7")

        with self.assertRaises(xslsetter.XsltError):
            md.skip_lines

    def test_set_skip_lines3(self):
        """Test an empty skip_lines line."""
        md = xslsetter.MetadataHandler("bogus.xml", create=True)
        md.set_variable("skip_lines", " ")
        got = md.skip_lines
        want = []

        self.assertEqual(got, want)

    def test_set_skip_pages1(self):
        """Test a valid skip_pages line."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("skip_pages", "1, 4-5, 7")
        got = md.skip_pages
        want = [1, 4, 5, 7]

        self.assertEqual(got, want)

    def test_set_skip_pages2(self):
        """Test an invalid skip_pages line."""
        md = xslsetter.MetadataHandler("bogus.xml", create=True)
        md.set_variable("skip_pages", "1, 4 5, 7")

        with self.assertRaises(xslsetter.XsltError):
            md.skip_pages

    def test_set_skip_pages3(self):
        """Test an empty skip_pages line."""
        md = xslsetter.MetadataHandler("bogus.xml", create=True)
        md.set_variable("skip_pages", " ")
        got = md.skip_pages
        want = []

        self.assertEqual(got, want)

    def test_set_skip_pages4(self):
        """Test with odd as a page range."""
        md = xslsetter.MetadataHandler("bogus.xml", create=True)
        md.set_variable("skip_pages", "odd, 2")
        got = md.skip_pages
        want = ["odd", 2]

        self.assertEqual(got, want)

    def test_set_skip_pages5(self):
        """Test with even as a page range."""
        md = xslsetter.MetadataHandler("bogus.xml", create=True)
        md.set_variable("skip_pages", "even, 1")
        got = md.skip_pages
        want = ["even", 1]

        self.assertEqual(got, want)

    def test_set_skip_pages6(self):
        """Raise an exception if both odd and even are used."""
        md = xslsetter.MetadataHandler("bogus.xml", create=True)
        md.set_variable("skip_pages", "odd, even")

        with self.assertRaises(xslsetter.XsltError):
            md.skip_pages

    def test_set_linespacing_1(self):
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("linespacing", "odd=2")
        got = md.linespacing
        want = {"odd": 2.0}

        self.assertDictEqual(got, want)

    def test_set_linespacing_2(self):
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("linespacing", "even=2")
        got = md.linespacing
        want = {"even": 2.0}

        self.assertDictEqual(got, want)

    def test_set_linespacing_3(self):
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("linespacing", "all=2")
        got = md.linespacing
        want = {"all": 2.0}

        self.assertDictEqual(got, want)

    def test_set_linespacing_4(self):
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("linespacing", "all=2, even=1.6")

        with self.assertRaises(xslsetter.XsltError):
            md.linespacing

    def test_set_linespacing_5(self):
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("linespacing", "all=2,0")

        with self.assertRaises(xslsetter.XsltError):
            md.linespacing

    def test_set_linespacing_6(self):
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("linespacing", "1;2;3=0.5")

        got = md.linespacing
        want = {"1": 0.5, "2": 0.5, "3": 0.5}

        self.assertDictEqual(got, want)

    def test_set_linespacing_7(self):
        """Test the default value."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)

        got = md.linespacing
        want = {}

        self.assertDictEqual(got, want)

    def test_set_margin(self):
        """Test if the margin is set correctly."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)

        self.assertEqual(
            md.parse_margin_line("odd=230, even = 540 , 8 = 340"),
            {"odd": 230, "even": 540, "8": 340},
        )

    def test_parse_margin_lines1(self):
        """Test parse_margin_lines."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("left_margin", "7=7")
        md.set_variable("right_margin", "odd=4,even=8,3=6")
        md.set_variable("top_margin", "8=8")
        md.set_variable("bottom_margin", "9=2")

        self.assertEqual(
            md.margins,
            {
                "left_margin": {"7": 7},
                "right_margin": {"odd": 4, "even": 8, "3": 6},
                "top_margin": {"8": 8},
                "bottom_margin": {"9": 2},
            },
        )

    def test_parse_margin_lines2(self):
        """Raise ConversionError if both 'all' and 'even' is found."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("right_margin", "all=40,even=80")

        with self.assertRaises(xslsetter.XsltError):
            md.margins

    def test_parse_margin_lines3(self):
        """Raise ConversionError if 'all' and 'odd' is found."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("right_margin", "all=40,odd=80")

        with self.assertRaises(xslsetter.XsltError):
            md.margins

    def test_parse_margin_lines4(self):
        """Raise ConversionError if text after '=' is found."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("right_margin", "all=tullball")

        with self.assertRaises(xslsetter.XsltError):
            md.margins

    def test_parse_margin_lines5(self):
        """Raise ConversionError if no '=' is found."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("right_margin", "all 50")

        with self.assertRaises(xslsetter.XsltError):
            md.margins

    def test_parse_margin_lines6(self):
        """Line with no comma between values should raise an exception."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("right_margin", "all=50 3")

        with self.assertRaises(xslsetter.XsltError):
            md.margins

    def test_parse_margin_lines7(self):
        """Multiple pages with the same margin are separated by semicolon."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("right_margin", "1;3=50, 2=30")

        self.assertEqual(md.margins, {"right_margin": {"1": 50, "2": 30, "3": 50}})

    def test_inner_margin1(self):
        """Raise exception if inner_right is set and not inner_left."""
        for p in ["top", "bottom", "right", "left"]:
            md = xslsetter.MetadataHandler("bogus.pdf", create=True)
            md.set_variable("inner_" + p + "_margin", "5=30")

            with self.assertRaises(xslsetter.XsltError):
                md.inner_margins

    def test_inner_margin2(self):
        """Raise exception if not the same pages are set."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("inner_top_margin", "5=30")
        md.set_variable("inner_bottom_margin", "6=30")
        with self.assertRaises(xslsetter.XsltError):
            md.inner_margins

        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("inner_left_margin", "5=30")
        md.set_variable("inner_right_margin", "6=30")
        with self.assertRaises(xslsetter.XsltError):
            md.inner_margins

    def test_inner_margin3(self):
        """Test whether a correctly set inner margin gives the wanted result."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("inner_top_margin", "6=20, 5=20")
        md.set_variable("inner_bottom_margin", "5=30, 6=50")

        self.assertEqual(
            md.inner_margins,
            {
                "inner_bottom_margin": {"5": 30, "6": 50},
                "inner_top_margin": {"5": 20, "6": 20},
            },
        )

    def test_inner_margin4(self):
        """Test whether a correctly set inner margin gives the wanted result."""
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("inner_left_margin", "6=20, 5=20")
        md.set_variable("inner_right_margin", "5=30, 6=50")

        self.assertEqual(
            md.inner_margins,
            {
                "inner_right_margin": {"5": 30, "6": 50},
                "inner_left_margin": {"5": 20, "6": 20},
            },
        )

    def test_skip_elements_1(self):
        """Test if getting skip_elements is possible."""
        md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)
        md.set_variable(
            "skip_elements", ".//body/div[1]/h2[1];.//body/div[3]/div[1]/h3[1]"
        )

        self.assertEqual(
            md.skip_elements,
            [
                (
                    ".//html:body/html:div[1]/html:h2[1]",
                    ".//html:body/html:div[3]/html:div[1]/html:h3[1]",
                )
            ],
        )

    def test_skip_elements_2(self):
        """Test if getting a pair of skip_elements is possible."""
        md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)
        md.set_variable(
            "skip_elements",
            ".//body/div[5];.//body/div[8]/div[3]/h1[1], "
            ".//body/div[11]/div[2];.//body/div[11]/div[5]",
        )

        self.assertEqual(
            md.skip_elements,
            [
                (
                    ".//html:body/html:div[5]",
                    ".//html:body/html:div[8]/html:div[3]/html:h1[1]",
                ),
                (
                    ".//html:body/html:div[11]/html:div[2]",
                    ".//html:body/html:div[11]/html:div[5]",
                ),
            ],
        )

    def test_skip_elements_empty(self):
        """Empty skip_elements returns None."""
        md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)
        self.assertIsNone(md.skip_elements)

    def test_mlangs_empty(self):
        """Check for empty mlangs."""
        md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)

        self.assertSetEqual(set(), md.mlangs)

    def test_mlangs_set(self):
        """Check if languages are set and picked up."""
        languages = {"nob", "sme", "sma"}

        md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)

        for language in languages:
            md.set_mlang(language)

        self.assertSetEqual(languages, md.mlangs)

    def test_epub_chosen_chapters(self):
        md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)
        md.set_variable("epub_excluded_chapters", "1, 4-8, 15")
        got = md.epub_excluded_chapters
        want = [1, 4, 5, 6, 7, 8, 15]

        self.assertEqual(got, want)

test_inner_margin1()

Raise exception if inner_right is set and not inner_left.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_inner_margin1(self):
    """Raise exception if inner_right is set and not inner_left."""
    for p in ["top", "bottom", "right", "left"]:
        md = xslsetter.MetadataHandler("bogus.pdf", create=True)
        md.set_variable("inner_" + p + "_margin", "5=30")

        with self.assertRaises(xslsetter.XsltError):
            md.inner_margins

test_inner_margin2()

Raise exception if not the same pages are set.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_inner_margin2(self):
    """Raise exception if not the same pages are set."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("inner_top_margin", "5=30")
    md.set_variable("inner_bottom_margin", "6=30")
    with self.assertRaises(xslsetter.XsltError):
        md.inner_margins

    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("inner_left_margin", "5=30")
    md.set_variable("inner_right_margin", "6=30")
    with self.assertRaises(xslsetter.XsltError):
        md.inner_margins

test_inner_margin3()

Test whether a correctly set inner margin gives the wanted result.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_inner_margin3(self):
    """Test whether a correctly set inner margin gives the wanted result."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("inner_top_margin", "6=20, 5=20")
    md.set_variable("inner_bottom_margin", "5=30, 6=50")

    self.assertEqual(
        md.inner_margins,
        {
            "inner_bottom_margin": {"5": 30, "6": 50},
            "inner_top_margin": {"5": 20, "6": 20},
        },
    )

test_inner_margin4()

Test whether a correctly set inner margin gives the wanted result.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_inner_margin4(self):
    """Test whether a correctly set inner margin gives the wanted result."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("inner_left_margin", "6=20, 5=20")
    md.set_variable("inner_right_margin", "5=30, 6=50")

    self.assertEqual(
        md.inner_margins,
        {
            "inner_right_margin": {"5": 30, "6": 50},
            "inner_left_margin": {"5": 20, "6": 20},
        },
    )

test_mlangs_empty()

Check for empty mlangs.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_mlangs_empty(self):
    """Check for empty mlangs."""
    md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)

    self.assertSetEqual(set(), md.mlangs)

test_mlangs_set()

Check if languages are set and picked up.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_mlangs_set(self):
    """Check if languages are set and picked up."""
    languages = {"nob", "sme", "sma"}

    md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)

    for language in languages:
        md.set_mlang(language)

    self.assertSetEqual(languages, md.mlangs)

test_parse_margin_lines1()

Test parse_margin_lines.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_parse_margin_lines1(self):
    """Test parse_margin_lines."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("left_margin", "7=7")
    md.set_variable("right_margin", "odd=4,even=8,3=6")
    md.set_variable("top_margin", "8=8")
    md.set_variable("bottom_margin", "9=2")

    self.assertEqual(
        md.margins,
        {
            "left_margin": {"7": 7},
            "right_margin": {"odd": 4, "even": 8, "3": 6},
            "top_margin": {"8": 8},
            "bottom_margin": {"9": 2},
        },
    )

test_parse_margin_lines2()

Raise ConversionError if both 'all' and 'even' is found.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_parse_margin_lines2(self):
    """Raise ConversionError if both 'all' and 'even' is found."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("right_margin", "all=40,even=80")

    with self.assertRaises(xslsetter.XsltError):
        md.margins

test_parse_margin_lines3()

Raise ConversionError if 'all' and 'odd' is found.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_parse_margin_lines3(self):
    """Raise ConversionError if 'all' and 'odd' is found."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("right_margin", "all=40,odd=80")

    with self.assertRaises(xslsetter.XsltError):
        md.margins

test_parse_margin_lines4()

Raise ConversionError if text after '=' is found.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_parse_margin_lines4(self):
    """Raise ConversionError if text after '=' is found."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("right_margin", "all=tullball")

    with self.assertRaises(xslsetter.XsltError):
        md.margins

test_parse_margin_lines5()

Raise ConversionError if no '=' is found.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_parse_margin_lines5(self):
    """Raise ConversionError if no '=' is found."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("right_margin", "all 50")

    with self.assertRaises(xslsetter.XsltError):
        md.margins

test_parse_margin_lines6()

Line with no comma between values should raise an exception.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_parse_margin_lines6(self):
    """Line with no comma between values should raise an exception."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("right_margin", "all=50 3")

    with self.assertRaises(xslsetter.XsltError):
        md.margins

test_parse_margin_lines7()

Multiple pages with the same margin are separated by semicolon.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_parse_margin_lines7(self):
    """Multiple pages with the same margin are separated by semicolon."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("right_margin", "1;3=50, 2=30")

    self.assertEqual(md.margins, {"right_margin": {"1": 50, "2": 30, "3": 50}})

test_set_linespacing_7()

Test the default value.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_linespacing_7(self):
    """Test the default value."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)

    got = md.linespacing
    want = {}

    self.assertDictEqual(got, want)

test_set_margin()

Test if the margin is set correctly.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_margin(self):
    """Test if the margin is set correctly."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)

    self.assertEqual(
        md.parse_margin_line("odd=230, even = 540 , 8 = 340"),
        {"odd": 230, "even": 540, "8": 340},
    )

test_set_skip_lines1()

Test a valid skip_pages line.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_lines1(self):
    """Test a valid skip_pages line."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("skip_lines", "1, 4-5, 7")
    got = md.skip_lines
    want = [1, 4, 5, 7]

    self.assertEqual(got, want)

test_set_skip_lines2()

Test an invalid skip_lines line.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_lines2(self):
    """Test an invalid skip_lines line."""
    md = xslsetter.MetadataHandler("bogus.xml", create=True)
    md.set_variable("skip_lines", "1, 4 5, 7")

    with self.assertRaises(xslsetter.XsltError):
        md.skip_lines

test_set_skip_lines3()

Test an empty skip_lines line.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_lines3(self):
    """Test an empty skip_lines line."""
    md = xslsetter.MetadataHandler("bogus.xml", create=True)
    md.set_variable("skip_lines", " ")
    got = md.skip_lines
    want = []

    self.assertEqual(got, want)

test_set_skip_pages1()

Test a valid skip_pages line.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_pages1(self):
    """Test a valid skip_pages line."""
    md = xslsetter.MetadataHandler("bogus.pdf", create=True)
    md.set_variable("skip_pages", "1, 4-5, 7")
    got = md.skip_pages
    want = [1, 4, 5, 7]

    self.assertEqual(got, want)

test_set_skip_pages2()

Test an invalid skip_pages line.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_pages2(self):
    """Test an invalid skip_pages line."""
    md = xslsetter.MetadataHandler("bogus.xml", create=True)
    md.set_variable("skip_pages", "1, 4 5, 7")

    with self.assertRaises(xslsetter.XsltError):
        md.skip_pages

test_set_skip_pages3()

Test an empty skip_pages line.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_pages3(self):
    """Test an empty skip_pages line."""
    md = xslsetter.MetadataHandler("bogus.xml", create=True)
    md.set_variable("skip_pages", " ")
    got = md.skip_pages
    want = []

    self.assertEqual(got, want)

test_set_skip_pages4()

Test with odd as a page range.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_pages4(self):
    """Test with odd as a page range."""
    md = xslsetter.MetadataHandler("bogus.xml", create=True)
    md.set_variable("skip_pages", "odd, 2")
    got = md.skip_pages
    want = ["odd", 2]

    self.assertEqual(got, want)

test_set_skip_pages5()

Test with even as a page range.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_pages5(self):
    """Test with even as a page range."""
    md = xslsetter.MetadataHandler("bogus.xml", create=True)
    md.set_variable("skip_pages", "even, 1")
    got = md.skip_pages
    want = ["even", 1]

    self.assertEqual(got, want)

test_set_skip_pages6()

Raise an exception if both odd and even are used.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_set_skip_pages6(self):
    """Raise an exception if both odd and even are used."""
    md = xslsetter.MetadataHandler("bogus.xml", create=True)
    md.set_variable("skip_pages", "odd, even")

    with self.assertRaises(xslsetter.XsltError):
        md.skip_pages

test_skip_elements_1()

Test if getting skip_elements is possible.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_skip_elements_1(self):
    """Test if getting skip_elements is possible."""
    md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)
    md.set_variable(
        "skip_elements", ".//body/div[1]/h2[1];.//body/div[3]/div[1]/h3[1]"
    )

    self.assertEqual(
        md.skip_elements,
        [
            (
                ".//html:body/html:div[1]/html:h2[1]",
                ".//html:body/html:div[3]/html:div[1]/html:h3[1]",
            )
        ],
    )

test_skip_elements_2()

Test if getting a pair of skip_elements is possible.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_skip_elements_2(self):
    """Test if getting a pair of skip_elements is possible."""
    md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)
    md.set_variable(
        "skip_elements",
        ".//body/div[5];.//body/div[8]/div[3]/h1[1], "
        ".//body/div[11]/div[2];.//body/div[11]/div[5]",
    )

    self.assertEqual(
        md.skip_elements,
        [
            (
                ".//html:body/html:div[5]",
                ".//html:body/html:div[8]/html:div[3]/html:h1[1]",
            ),
            (
                ".//html:body/html:div[11]/html:div[2]",
                ".//html:body/html:div[11]/html:div[5]",
            ),
        ],
    )

test_skip_elements_empty()

Empty skip_elements returns None.

Source code in /home/anders/projects/CorpusTools/corpustools/test/test_xslsetter.py 
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def test_skip_elements_empty(self):
    """Empty skip_elements returns None."""
    md = xslsetter.MetadataHandler("bogus.epub.xsl", create=True)
    self.assertIsNone(md.skip_elements)