true, 'verboseOutput' => true ]); //

の中身だけ
$inner = function(string $tex, bool $display = false): string {
  $html = (new Latex())->render($tex, $display);
  return preg_replace('#^]*>|

$#', '', $html); }; $test->describe('LaTeXからMathMLへの変換', function($test) use ($inner): void { $test->it('

要素で囲み、元のLaTeXをalttextに入れるはず', function($test): void {
    $test->assertEquals(' x', (new Latex())->render('x'));
    $test->assertEquals(' x', (new Latex())->render('x', true));
    $test->assertStringContains('alttext="a < b"', (new Latex())->render('a < b'));
  });

  $test->it('識別子・数字・演算子を区別するはず', function($test) use ($inner): void {
    $test->assertEquals(' a + 12.5', $inner('a + 12.5'));
    $test->assertEquals(' a < b', $inner('a < b'));
  });

  $test->it('上付き・下付きを変換するはず', function($test) use ($inner): void {
    $test->assertEquals(' x^{2}', $inner('x^2'));
    $test->assertEquals(' a_{i}^{2}', $inner('a_i^2'));
  });

  $test->it('分数と根号を変換するはず', function($test) use ($inner): void {
    $test->assertEquals(' \frac{a}{b}', $inner('\frac{a}{b}'));
    $test->assertEquals(' \sqrt{x}', $inner('\sqrt{x}'));
    $test->assertEquals(' \sqrt[3]{x}', $inner('\sqrt[3]{x}'));
  });

  $test->it('ギリシャ文字と記号を変換するはず', function($test) use ($inner): void {
    $test->assertEquals(' α + β', $inner('\alpha + \beta'));
    $test->assertStringContains(' \to', $inner('x \to 0'));
    $test->assertStringContains(' \leq', $inner('a \leq b'));
  });

  $test->it('関数名を立体にし、細い空白を入れるはず', function($test) use ($inner): void {
    $test->assertEquals(' \sin x', $inner('\sin x'));
    $test->assertStringContains(' tr', $inner('\operatorname{tr} A'));
  });

  $test->it('大型演算子と極限を変換するはず', function($test) use ($inner): void {
    $test->assertStringContains(' \sum_{', $inner('\sum_{i=1}^{n} i'));
    $test->assertStringContains('}^{{lim}_{', $inner('\lim_{x \to 0} f'));
  });

  $test->it('行列と括弧を変換するはず', function($test) use ($inner): void {
    $m = $inner('\begin{pmatrix} 1 & 2 \\\\ 3 & 4 \end{pmatrix}');
    $test->assertStringContains(' \begin{matrix} 1 & 2 \\ 3 & 4 \end{matrix}', $m);
    $test->assertStringContains('form="prefix">(', $m);
    $test->assertStringContains('form="postfix">)', $m);
    $test->assertStringContains('form="prefix">(x', $inner('\left( x \right)'));
  });

  $test->it('文字の種類とアクセントを変換するはず', function($test) use ($inner): void {
    $test->assertEquals(' 𝐯', $inner('\mathbf{v}'));
    $test->assertStringContains(' d', $inner('\mathrm{d}x'));
    $test->assertStringContains(' \overset{if}{', $inner('\vec{v}'));
    $test->assertStringContains('}}}