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package org.terst.feedreader.ui
import org.junit.Assert.assertTrue
import org.junit.Test
/**
* The reader's end of maths rendering.
*
* Extraction converts a page's TeX source to MathML (see ReaderExtractor), which the
* WebView renders natively -- no script, no webfont, no stylesheet of KaTeX's. Two things
* still have to be true of the reader HTML itself: the MathML has to reach the WebView
* intact (the wrapping passes rewrite iframes and images, and must not touch it), and a
* wide equation must not be able to drag the whole article into horizontal scrolling --
* an aligned multi-line derivation is routinely wider than a phone screen, and `math`
* does not obey the `img`/`svg` clamps already in the stylesheet.
*/
class ReaderMathTest {
private val displayMath =
"<math xmlns=\"http://www.w3.org/1998/Math/MathML\" display=\"block\"><semantics>" +
"<mtable><mtr><mtd><mi>t</mi></mtd></mtr></mtable></semantics></math>"
@Test
fun `mathml reaches the webview unchanged`() {
val html = wrapReaderHtml("<p>A slice of the set:</p>$displayMath<p>and so on.</p>")
assertTrue("MathML must survive the reader's HTML assembly verbatim", html.contains(displayMath))
}
@Test
fun `a wide equation scrolls inside itself instead of scrolling the article`() {
val html = wrapReaderHtml("<p>x</p>$displayMath")
val style = html.substringAfter("<style>").substringBefore("</style>")
val displayMathRule = style.lines()
.joinToString(" ")
.substringAfter("math[display=\"block\"]", "")
.substringBefore("}")
assertTrue(
"the stylesheet needs a math[display=\"block\"] rule, found none in:\n$style",
displayMathRule.isNotBlank()
)
assertTrue(
"display maths must scroll within its own box, got: $displayMathRule",
displayMathRule.contains("overflow-x: auto")
)
}
}
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