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vendor/phpoffice/math/tests/Math/Element/AbstractGroupElementTest.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Element;
+
+use PhpOffice\Math\Element;
+use PHPUnit\Framework\TestCase;
+
+class AbstractGroupElementTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $row = new Element\Row();
+
+        $this->assertIsArray($row->getElements());
+        $this->assertCount(0, $row->getElements());
+    }
+
+    public function testAdd(): void
+    {
+        $identifierA = new Element\Identifier('a');
+        $row = new Element\Row();
+
+        $this->assertCount(0, $row->getElements());
+
+        $this->assertInstanceOf(Element\AbstractGroupElement::class, $row->add($identifierA));
+
+        $this->assertCount(1, $row->getElements());
+        $this->assertEquals([$identifierA], $row->getElements());
+    }
+
+    public function testRemove(): void
+    {
+        $identifierA = new Element\Identifier('a');
+
+        $row = new Element\Row();
+        $row->add($identifierA);
+
+        $this->assertCount(1, $row->getElements());
+
+        $this->assertInstanceOf(Element\AbstractGroupElement::class, $row->remove($identifierA));
+
+        $this->assertCount(0, $row->getElements());
+    }
+}

vendor/phpoffice/math/tests/Math/Element/FractionTest.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Element;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Element\Fraction;
+use PHPUnit\Framework\TestCase;
+
+class FractionTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $identifierA = new Element\Identifier('a');
+        $identifierB = new Element\Identifier('b');
+
+        $fraction = new Fraction($identifierA, $identifierB);
+
+        $this->assertEquals($identifierA, $fraction->getNumerator());
+        $this->assertEquals($identifierB, $fraction->getDenominator());
+    }
+
+    public function testBase(): void
+    {
+        $identifierA = new Element\Identifier('a');
+        $identifierB = new Element\Identifier('b');
+        $identifierC = new Element\Identifier('c');
+
+        $fraction = new Fraction($identifierA, $identifierB);
+
+        $this->assertEquals($identifierA, $fraction->getNumerator());
+        $this->assertInstanceOf(Fraction::class, $fraction->setNumerator($identifierC));
+        $this->assertEquals($identifierC, $fraction->getNumerator());
+    }
+
+    public function testFraction(): void
+    {
+        $identifierA = new Element\Identifier('a');
+        $identifierB = new Element\Identifier('b');
+        $identifierC = new Element\Identifier('c');
+
+        $fraction = new Fraction($identifierA, $identifierB);
+
+        $this->assertEquals($identifierB, $fraction->getDenominator());
+        $this->assertInstanceOf(Fraction::class, $fraction->setDenominator($identifierC));
+        $this->assertEquals($identifierC, $fraction->getDenominator());
+    }
+}

vendor/phpoffice/math/tests/Math/Element/IdentifierTest.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Element;
+
+use PhpOffice\Math\Element\Identifier;
+use PHPUnit\Framework\TestCase;
+
+class IdentifierTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $operator = new Identifier('x');
+
+        $this->assertEquals('x', $operator->getValue());
+    }
+}

vendor/phpoffice/math/tests/Math/Element/NumericTest.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Element;
+
+use PhpOffice\Math\Element\Numeric;
+use PHPUnit\Framework\TestCase;
+
+class NumericTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $numeric = new Numeric(2);
+
+        $this->assertEquals(2, $numeric->getValue());
+    }
+}

vendor/phpoffice/math/tests/Math/Element/OperatorTest.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Element;
+
+use PhpOffice\Math\Element\Operator;
+use PHPUnit\Framework\TestCase;
+
+class OperatorTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $operator = new Operator('+');
+
+        $this->assertEquals('+', $operator->getValue());
+    }
+}

vendor/phpoffice/math/tests/Math/Element/SemanticsTest.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Element;
+
+use PhpOffice\Math\Element\Semantics;
+use PHPUnit\Framework\TestCase;
+
+class SemanticsTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $semantics = new Semantics();
+
+        $this->assertIsArray($semantics->getAnnotations());
+        $this->assertCount(0, $semantics->getAnnotations());
+    }
+
+    public function testAnnotation(): void
+    {
+        $semantics = new Semantics();
+
+        $this->assertIsArray($semantics->getAnnotations());
+        $this->assertCount(0, $semantics->getAnnotations());
+
+        $this->assertInstanceOf(Semantics::class, $semantics->addAnnotation('encoding', 'content'));
+        $this->assertEquals(['encoding' => 'content'], $semantics->getAnnotations());
+        $this->assertCount(1, $semantics->getAnnotations());
+
+        $this->assertEquals('content', $semantics->getAnnotation('encoding'));
+        $this->assertNull($semantics->getAnnotation('notexisting'));
+    }
+}

vendor/phpoffice/math/tests/Math/Element/SuperscriptTest.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Element;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Element\Superscript;
+use PHPUnit\Framework\TestCase;
+
+class SuperscriptTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $superscript = new Superscript(new Element\Identifier('a'), new Element\Identifier('a'));
+
+        $this->assertInstanceOf(Element\Identifier::class, $superscript->getBase());
+        $this->assertInstanceOf(Element\Identifier::class, $superscript->getSuperscript());
+    }
+
+    public function testBase(): void
+    {
+        $identifierA = new Element\Identifier('a');
+        $identifierB = new Element\Identifier('b');
+        $identifierC = new Element\Identifier('c');
+
+        $superscript = new Superscript($identifierA, $identifierB);
+
+        $this->assertEquals($identifierA, $superscript->getBase());
+        $this->assertInstanceOf(Superscript::class, $superscript->setBase($identifierC));
+        $this->assertEquals($identifierC, $superscript->getBase());
+    }
+
+    public function testSuperscript(): void
+    {
+        $identifierA = new Element\Identifier('a');
+        $identifierB = new Element\Identifier('b');
+        $identifierC = new Element\Identifier('c');
+
+        $superscript = new Superscript($identifierA, $identifierB);
+
+        $this->assertEquals($identifierB, $superscript->getSuperscript());
+        $this->assertInstanceOf(Superscript::class, $superscript->setSuperscript($identifierC));
+        $this->assertEquals($identifierC, $superscript->getSuperscript());
+    }
+}

vendor/phpoffice/math/tests/Math/Reader/MathMLTest.php

@@ -0,0 +1,243 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Reader;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Exception\InvalidInputException;
+use PhpOffice\Math\Exception\NotImplementedException;
+use PhpOffice\Math\Math;
+use PhpOffice\Math\Reader\MathML;
+use PHPUnit\Framework\TestCase;
+
+class MathMLTest extends TestCase
+{
+    public function testReadBasic(): void
+    {
+        $content = '<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">
+        <math xmlns="http://www.w3.org/1998/Math/MathML">
+            <mrow>
+                <mi>a</mi> <mo>&InvisibleTimes;</mo> <msup><mi>x</mi><mn>2</mn></msup>
+                <mo>+</mo><mi>b</mi><mo>&InvisibleTimes;</mo><mi>x</mi>
+                <mo>+</mo><mi>c</mi>
+            </mrow>
+        </math>';
+
+        $reader = new MathML();
+        $math = $reader->read($content);
+        $this->assertInstanceOf(Math::class, $math);
+
+        $elements = $math->getElements();
+        $this->assertCount(1, $elements);
+        $this->assertInstanceOf(Element\Row::class, $elements[0]);
+
+        /** @var Element\Row $element */
+        $element = $elements[0];
+        $subElements = $element->getElements();
+        $this->assertCount(9, $subElements);
+
+        /** @var Element\Identifier $subElement */
+        $subElement = $subElements[0];
+        $this->assertInstanceOf(Element\Identifier::class, $subElement);
+        $this->assertEquals('a', $subElement->getValue());
+
+        /** @var Element\Identifier $subElement */
+        $subElement = $subElements[1];
+        $this->assertInstanceOf(Element\Operator::class, $subElement);
+        $this->assertEquals('InvisibleTimes', $subElement->getValue());
+
+        /** @var Element\Superscript $subElement */
+        $subElement = $subElements[2];
+        $this->assertInstanceOf(Element\Superscript::class, $subElements[2]);
+
+        /** @var Element\Identifier $base */
+        $base = $subElement->getBase();
+        $this->assertInstanceOf(Element\Identifier::class, $base);
+        $this->assertEquals('x', $base->getValue());
+
+        /** @var Element\Numeric $superscript */
+        $superscript = $subElement->getSuperscript();
+        $this->assertInstanceOf(Element\Numeric::class, $superscript);
+        $this->assertEquals(2, $superscript->getValue());
+
+        /** @var Element\Operator $subElement */
+        $subElement = $subElements[3];
+        $this->assertInstanceOf(Element\Operator::class, $subElement);
+        $this->assertEquals('+', $subElement->getValue());
+
+        /** @var Element\Identifier $subElement */
+        $subElement = $subElements[4];
+        $this->assertInstanceOf(Element\Identifier::class, $subElement);
+        $this->assertEquals('b', $subElement->getValue());
+
+        /** @var Element\Operator $subElement */
+        $subElement = $subElements[5];
+        $this->assertInstanceOf(Element\Operator::class, $subElement);
+        $this->assertEquals('InvisibleTimes', $subElement->getValue());
+
+        /** @var Element\Identifier $subElement */
+        $subElement = $subElements[6];
+        $this->assertInstanceOf(Element\Identifier::class, $subElement);
+        $this->assertEquals('x', $subElement->getValue());
+
+        /** @var Element\Operator $subElement */
+        $subElement = $subElements[7];
+        $this->assertInstanceOf(Element\Operator::class, $subElement);
+        $this->assertEquals('+', $subElement->getValue());
+
+        /** @var Element\Identifier $subElement */
+        $subElement = $subElements[8];
+        $this->assertInstanceOf(Element\Identifier::class, $subElement);
+        $this->assertEquals('c', $subElement->getValue());
+    }
+
+    public function testReadFraction(): void
+    {
+        $content = '<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">
+        <math xmlns="http://www.w3.org/1998/Math/MathML">
+            <mfrac bevelled="true">
+                <mfrac>
+                    <mi> a </mi>
+                    <mi> b </mi>
+                </mfrac>
+                <mfrac>
+                    <mi> c </mi>
+                    <mi> d </mi>
+                </mfrac>
+            </mfrac>
+        </math>';
+
+        $reader = new MathML();
+        $math = $reader->read($content);
+        $this->assertInstanceOf(Math::class, $math);
+
+        $elements = $math->getElements();
+        $this->assertCount(1, $elements);
+        $this->assertInstanceOf(Element\Fraction::class, $elements[0]);
+
+        /** @var Element\Fraction $element */
+        $element = $elements[0];
+
+        $this->assertInstanceOf(Element\Fraction::class, $element->getNumerator());
+        /** @var Element\Fraction $subElement */
+        $subElement = $element->getNumerator();
+
+        /** @var Element\Identifier $numerator */
+        $numerator = $subElement->getNumerator();
+        $this->assertInstanceOf(Element\Identifier::class, $numerator);
+        $this->assertEquals('a', $numerator->getValue());
+        /** @var Element\Identifier $denominator */
+        $denominator = $subElement->getDenominator();
+        $this->assertInstanceOf(Element\Identifier::class, $denominator);
+        $this->assertEquals('b', $denominator->getValue());
+
+        $this->assertInstanceOf(Element\Fraction::class, $element->getDenominator());
+        /** @var Element\Fraction $subElement */
+        $subElement = $element->getDenominator();
+
+        /** @var Element\Identifier $numerator */
+        $numerator = $subElement->getNumerator();
+        $this->assertInstanceOf(Element\Identifier::class, $numerator);
+        $this->assertEquals('c', $numerator->getValue());
+        /** @var Element\Identifier $denominator */
+        $denominator = $subElement->getDenominator();
+        $this->assertInstanceOf(Element\Identifier::class, $denominator);
+        $this->assertEquals('d', $denominator->getValue());
+    }
+
+    public function testReadFractionInvalid(): void
+    {
+        $this->expectException(InvalidInputException::class);
+        $this->expectExceptionMessage('PhpOffice\Math\Reader\MathML::getElement : The tag `mfrac` has not two subelements');
+
+        $content = '<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">
+        <math xmlns="http://www.w3.org/1998/Math/MathML">
+            <mfrac>
+                <mi> a </mi>
+            </mfrac>
+        </math>';
+
+        $reader = new MathML();
+        $math = $reader->read($content);
+    }
+
+    public function testReadSuperscriptInvalid(): void
+    {
+        $this->expectException(InvalidInputException::class);
+        $this->expectExceptionMessage('PhpOffice\Math\Reader\MathML::getElement : The tag `msup` has not two subelements');
+
+        $content = '<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">
+        <math xmlns="http://www.w3.org/1998/Math/MathML">
+            <msup>
+                <mi> a </mi>
+            </msup>
+        </math>';
+
+        $reader = new MathML();
+        $math = $reader->read($content);
+    }
+
+    public function testReadSemantics(): void
+    {
+        $content = '<?xml version="1.0" encoding="UTF-8"?>
+        <math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
+            <semantics>
+                <mrow>
+                    <mfrac>
+                        <mi>π</mi>
+                        <mn>2</mn>
+                    </mfrac>
+                    <mo stretchy="false">+</mo>
+                    <mrow>
+                        <mi>a</mi>
+                        <mo stretchy="false">∗</mo>
+                        <mn>2</mn>
+                    </mrow>
+                </mrow>
+                <annotation encoding="StarMath 5.0">{π} over {2}  + { a } * 2 </annotation>
+            </semantics>
+        </math>';
+
+        $reader = new MathML();
+        $math = $reader->read($content);
+        $this->assertInstanceOf(Math::class, $math);
+
+        $elements = $math->getElements();
+        $this->assertCount(1, $elements);
+        $this->assertInstanceOf(Element\Semantics::class, $elements[0]);
+
+        /** @var Element\Semantics $element */
+        $element = $elements[0];
+
+        // Check MathML
+        $subElements = $element->getElements();
+        $this->assertCount(1, $subElements);
+        $this->assertInstanceOf(Element\Row::class, $subElements[0]);
+
+        // Check Annotation
+        $this->assertCount(1, $element->getAnnotations());
+        $this->assertEquals('{π} over {2}  + { a } * 2', $element->getAnnotation('StarMath 5.0'));
+    }
+
+    public function testReadNotImplemented(): void
+    {
+        $this->expectException(NotImplementedException::class);
+        $this->expectExceptionMessage('PhpOffice\Math\Reader\MathML::getElement : The tag `mnotexisting` is not implemented');
+
+        $content = '<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">
+        <math xmlns="http://www.w3.org/1998/Math/MathML">
+            <mnotexisting>
+                <mi> a </mi>
+            </mnotexisting>
+        </math>';
+
+        $reader = new MathML();
+        $math = $reader->read($content);
+    }
+}

vendor/phpoffice/math/tests/Math/Reader/OfficeMathMLTest.php

@@ -0,0 +1,197 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Reader;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Exception\InvalidInputException;
+use PhpOffice\Math\Exception\NotImplementedException;
+use PhpOffice\Math\Math;
+use PhpOffice\Math\Reader\OfficeMathML;
+use PHPUnit\Framework\TestCase;
+
+class OfficeMathMLTest extends TestCase
+{
+    public function testRead(): void
+    {
+        $content = '<m:oMathPara xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
+        <m:oMath>
+          <m:f>
+            <m:num><m:r><m:t>2</m:t></m:r></m:num>
+            <m:den><m:r><m:t>π</m:t></m:r></m:den>
+          </m:f>
+        </m:oMath>
+      </m:oMathPara>';
+
+        $reader = new OfficeMathML();
+        $math = $reader->read($content);
+        $this->assertInstanceOf(Math::class, $math);
+
+        $elements = $math->getElements();
+        $this->assertCount(1, $elements);
+        $this->assertInstanceOf(Element\Row::class, $elements[0]);
+
+        /** @var Element\Row $element */
+        $element = $elements[0];
+        $subElements = $element->getElements();
+        $this->assertCount(1, $subElements);
+        $this->assertInstanceOf(Element\Fraction::class, $subElements[0]);
+
+        /** @var Element\Fraction $subElement */
+        $subElement = $subElements[0];
+
+        /** @var Element\Identifier $numerator */
+        $numerator = $subElement->getNumerator();
+        $this->assertInstanceOf(Element\Numeric::class, $numerator);
+        $this->assertEquals(2, $numerator->getValue());
+
+        /** @var Element\Numeric $denominator */
+        $denominator = $subElement->getDenominator();
+        $this->assertInstanceOf(Element\Identifier::class, $denominator);
+        $this->assertEquals('π', $denominator->getValue());
+    }
+
+    public function testReadWithWTag(): void
+    {
+        $content = '<m:oMath xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
+          <m:f>
+            <m:num>
+              <m:r>
+                <w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr>
+                <m:t xml:space="preserve">π</m:t>
+              </m:r>
+            </m:num>
+            <m:den>
+              <m:r>
+                <w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr>
+                <m:t xml:space="preserve">2</m:t>
+              </m:r>
+            </m:den>
+          </m:f>
+          <m:r>
+            <w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr>
+            <m:t xml:space="preserve">+</m:t>
+          </m:r>
+          <m:r>
+            <w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr>
+            <m:t xml:space="preserve">a</m:t>
+          </m:r>
+          <m:r>
+            <w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr>
+            <m:t xml:space="preserve">∗</m:t>
+          </m:r>
+          <m:r>
+            <w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr>
+            <m:t xml:space="preserve">2</m:t>
+          </m:r>
+        </m:oMath>';
+
+        $reader = new OfficeMathML();
+        $math = $reader->read($content);
+        $this->assertInstanceOf(Math::class, $math);
+
+        $elements = $math->getElements();
+        $this->assertCount(5, $elements);
+
+        /** @var Element\Fraction $element */
+        $element = $elements[0];
+        $this->assertInstanceOf(Element\Fraction::class, $element);
+        /** @var Element\Identifier $numerator */
+        $numerator = $element->getNumerator();
+        $this->assertInstanceOf(Element\Identifier::class, $numerator);
+        $this->assertEquals('π', $numerator->getValue());
+        /** @var Element\Numeric $denominator */
+        $denominator = $element->getDenominator();
+        $this->assertInstanceOf(Element\Numeric::class, $denominator);
+        $this->assertEquals(2, $denominator->getValue());
+
+        /** @var Element\Operator $element */
+        $element = $elements[1];
+        $this->assertInstanceOf(Element\Operator::class, $element);
+        $this->assertEquals('+', $element->getValue());
+
+        /** @var Element\Identifier $element */
+        $element = $elements[2];
+        $this->assertInstanceOf(Element\Identifier::class, $element);
+        $this->assertEquals('a', $element->getValue());
+
+        /** @var Element\Operator $element */
+        $element = $elements[3];
+        $this->assertInstanceOf(Element\Operator::class, $element);
+        $this->assertEquals('∗', $element->getValue());
+
+        /** @var Element\Numeric $element */
+        $element = $elements[4];
+        $this->assertInstanceOf(Element\Numeric::class, $element);
+        $this->assertEquals(2, $element->getValue());
+    }
+
+    public function testReadFractionNoNumerator(): void
+    {
+        $this->expectException(InvalidInputException::class);
+        $this->expectExceptionMessage('PhpOffice\Math\Reader\OfficeMathML::getElement : The tag `m:f` has no numerator defined');
+
+        $content = '<m:oMathPara xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
+          <m:oMath>
+            <m:f>
+              <m:den><m:r><m:t>2</m:t></m:r></m:den>
+            </m:f>
+          </m:oMath>
+        </m:oMathPara>';
+
+        $reader = new OfficeMathML();
+        $math = $reader->read($content);
+    }
+
+    public function testReadFractionNoDenominator(): void
+    {
+        $this->expectException(InvalidInputException::class);
+        $this->expectExceptionMessage('PhpOffice\Math\Reader\OfficeMathML::getElement : The tag `m:f` has no denominator defined');
+
+        $content = '<m:oMathPara xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
+          <m:oMath>
+            <m:f>
+              <m:num><m:r><m:t>π</m:t></m:r></m:num>
+            </m:f>
+          </m:oMath>
+        </m:oMathPara>';
+
+        $reader = new OfficeMathML();
+        $math = $reader->read($content);
+    }
+
+    public function testReadBasicNoText(): void
+    {
+        $this->expectException(InvalidInputException::class);
+        $this->expectExceptionMessage('PhpOffice\Math\Reader\OfficeMathML::getElement : The tag `m:r` has no tag `m:t` defined');
+
+        $content = '<m:oMathPara xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
+          <m:oMath>
+            <m:r>
+              a
+            </m:r>
+          </m:oMath>
+        </m:oMathPara>';
+
+        $reader = new OfficeMathML();
+        $math = $reader->read($content);
+    }
+
+    public function testReadNotImplemented(): void
+    {
+        $this->expectException(NotImplementedException::class);
+        $this->expectExceptionMessage('PhpOffice\Math\Reader\OfficeMathML::getElement : The tag `m:mnotexisting` is not implemented');
+
+        $content = '<m:oMathPara xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
+          <m:oMath>
+            <m:mnotexisting>
+              <m:num><m:r><m:t>π</m:t></m:r></m:num>
+            </m:mnotexisting>
+          </m:oMath>
+        </m:oMathPara>';
+
+        $reader = new OfficeMathML();
+        $math = $reader->read($content);
+    }
+}

vendor/phpoffice/math/tests/Math/Writer/MathMLTest.php

@@ -0,0 +1,104 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Writer;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Exception\NotImplementedException;
+use PhpOffice\Math\Math;
+use PhpOffice\Math\Writer\MathML;
+
+class MathMLTest extends WriterTestCase
+{
+    public function testWrite(): void
+    {
+        $opTimes = new Element\Operator('&InvisibleTimes;');
+
+        $math = new Math();
+
+        $row = new Element\Row();
+        $math->add($row);
+
+        $row->add(new Element\Identifier('a'));
+        $row->add(clone $opTimes);
+
+        $superscript = new Element\Superscript(
+            new Element\Identifier('x'),
+            new Element\Numeric(2)
+        );
+        $row->add($superscript);
+
+        $row->add(new Element\Operator('+'));
+
+        $row->add(new Element\Identifier('b'));
+        $row->add(clone $opTimes);
+        $row->add(new Element\Identifier('x'));
+
+        $row->add(new Element\Operator('+'));
+
+        $row->add(new Element\Identifier('c'));
+
+        $writer = new MathML();
+        $output = $writer->write($math);
+
+        $expected = '<?xml version="1.0" encoding="UTF-8"?>'
+            . PHP_EOL
+            . '<!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">'
+            . '<math xmlns="http://www.w3.org/1998/Math/MathML">'
+            . '<mrow><mi>a</mi><mo>&amp;InvisibleTimes;</mo><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mi>b</mi><mo>&amp;InvisibleTimes;</mo><mi>x</mi><mo>+</mo><mi>c</mi>'
+            . '</mrow>'
+            . '</math>'
+            . PHP_EOL;
+        $this->assertEquals($expected, $output);
+        $this->assertIsSchemaMathMLValid($output);
+    }
+
+    public function testWriteFraction(): void
+    {
+        $math = new Math();
+
+        $fraction = new Element\Fraction(
+            new Element\Identifier('π'),
+            new Element\Numeric(2)
+        );
+        $math->add($fraction);
+
+        $writer = new MathML();
+        $output = $writer->write($math);
+
+        $expected = '<?xml version="1.0" encoding="UTF-8"?>'
+            . PHP_EOL
+            . '<!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">'
+            . '<math xmlns="http://www.w3.org/1998/Math/MathML">'
+            . '<mfrac>'
+            . '<mi>π</mi><mn>2</mn>'
+            . '</mfrac>'
+            . '</math>'
+            . PHP_EOL;
+        $this->assertEquals($expected, $output);
+        $this->assertIsSchemaMathMLValid($output);
+    }
+
+    public function testWriteNotImplemented(): void
+    {
+        $this->expectException(NotImplementedException::class);
+        if (method_exists($this, 'expectExceptionMessageRegExp')) {
+            $this->expectExceptionMessageRegExp('/PhpOffice\\\Math\\\Writer\\\MathML::getElementTagName : The element of the class/');
+            $this->expectExceptionMessageRegExp('/has no tag name/');
+        } else {
+            // @phpstan-ignore-next-line
+            $this->expectExceptionMessageMatches('/PhpOffice\\\Math\\\Writer\\\MathML::getElementTagName : The element of the class/');
+            // @phpstan-ignore-next-line
+            $this->expectExceptionMessageMatches('/has no tag name/');
+        }
+
+        $math = new Math();
+
+        $object = new class() extends Element\AbstractElement {};
+        $math->add($object);
+
+        $writer = new MathML();
+        $output = $writer->write($math);
+    }
+}

vendor/phpoffice/math/tests/Math/Writer/OfficeMathMLTest.php

@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Writer;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Exception\NotImplementedException;
+use PhpOffice\Math\Math;
+use PhpOffice\Math\Writer\OfficeMathML;
+
+class OfficeMathMLTest extends WriterTestCase
+{
+    public function testWriteFraction(): void
+    {
+        $math = new Math();
+
+        $fraction = new Element\Fraction(
+            new Element\Identifier('π'),
+            new Element\Numeric(2)
+        );
+        $math->add($fraction);
+
+        $writer = new OfficeMathML();
+        $output = $writer->write($math);
+
+        $expected = '<m:oMathPara xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">'
+            . '<m:oMath>'
+            . '<m:f>'
+            . '<m:num><m:r><m:t>π</m:t></m:r></m:num>'
+            . '<m:den><m:r><m:t>2</m:t></m:r></m:den>'
+            . '</m:f>'
+            . '</m:oMath>'
+            . '</m:oMathPara>';
+        $this->assertEquals($expected, $output);
+    }
+
+    public function testWriteRow(): void
+    {
+        $math = new Math();
+
+        $row = new Element\Row();
+        $math->add($row);
+
+        $row->add(new Element\Identifier('x'));
+
+        $writer = new OfficeMathML();
+        $output = $writer->write($math);
+
+        $expected = '<m:oMathPara xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">'
+            . '<m:oMath>'
+            . '<m:r><m:t>x</m:t></m:r>'
+            . '</m:oMath>'
+            . '</m:oMathPara>';
+        $this->assertEquals($expected, $output);
+    }
+
+    public function testWriteNotImplemented(): void
+    {
+        $this->expectException(NotImplementedException::class);
+        if (method_exists($this, 'expectExceptionMessageRegExp')) {
+            $this->expectExceptionMessageRegExp('/PhpOffice\\\Math\\\Writer\\\OfficeMathML::getElementTagName : The element of the class/');
+            $this->expectExceptionMessageRegExp('/has no tag name/');
+        } else {
+            // @phpstan-ignore-next-line
+            $this->expectExceptionMessageMatches('/PhpOffice\\\Math\\\Writer\\\OfficeMathML::getElementTagName : The element of the class/');
+            // @phpstan-ignore-next-line
+            $this->expectExceptionMessageMatches('/has no tag name/');
+        }
+
+        $math = new Math();
+
+        $object = new class() extends Element\AbstractElement {};
+        $math->add($object);
+
+        $writer = new OfficeMathML();
+        $output = $writer->write($math);
+    }
+}

vendor/phpoffice/math/tests/Math/Writer/WriterTestCase.php

@@ -0,0 +1,83 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PhpOffice\Math\Writer;
+
+use DOMDocument;
+use LibXMLError;
+use PHPUnit\Framework\TestCase;
+
+class WriterTestCase extends TestCase
+{
+    public function assertIsSchemaMathMLValid(string $content): void
+    {
+        $dom = new DOMDocument();
+        $dom->loadXML($content);
+        $xmlSource = $dom->saveXML();
+
+        if (is_string($xmlSource)) {
+            $dom->loadXML($xmlSource);
+            $dom->schemaValidate(dirname(__DIR__, 2) . '/resources/schema/mathml3/mathml3.xsd');
+
+            $error = libxml_get_last_error();
+            if ($error instanceof LibXMLError) {
+                $this->failXmlError($error, $xmlSource);
+            } else {
+                $this->assertTrue(true);
+            }
+
+            return;
+        }
+
+        $this->fail(sprintf('The XML is not valid : %s', $content));
+    }
+
+    /**
+     * @param array<string, string> $params
+     */
+    protected function failXmlError(LibXMLError $error, string $source, array $params = []): void
+    {
+        switch ($error->level) {
+            case LIBXML_ERR_WARNING:
+                $errorType = 'warning';
+                break;
+            case LIBXML_ERR_ERROR:
+                $errorType = 'error';
+                break;
+            case LIBXML_ERR_FATAL:
+                $errorType = 'fatal';
+                break;
+            default:
+                $errorType = 'Error';
+                break;
+        }
+        $errorLine = (int) $error->line;
+        $contents = explode("\n", $source);
+        $lines = [];
+        if (isset($contents[$errorLine - 2])) {
+            $lines[] = '>> ' . $contents[$errorLine - 2];
+        }
+        if (isset($contents[$errorLine - 1])) {
+            $lines[] = '>>> ' . $contents[$errorLine - 1];
+        }
+        if (isset($contents[$errorLine])) {
+            $lines[] = '>> ' . $contents[$errorLine];
+        }
+        $paramStr = '';
+        if (!empty($params)) {
+            $paramStr .= "\n" . ' - Parameters :' . "\n";
+            foreach ($params as $key => $val) {
+                $paramStr .= '   - ' . $key . ' : ' . $val . "\n";
+            }
+        }
+        $this->fail(sprintf(
+            "Validation %s :\n - - Line : %s\n - Message : %s - Lines :\n%s%s",
+            $errorType,
+            $error->line,
+            $error->message,
+            implode(PHP_EOL, $lines),
+            $paramStr
+        ));
+    }
+}