Expand public API of Components

Ref: https://github.com/erusev/parsedown/issues/694

tests/src/Components/Inlines/EmphasisTest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Erusev\Parsedown\Tests\Components\Inlines;
+
+use Erusev\Parsedown\Components\Inlines\Emphasis;
+use Erusev\Parsedown\Parsing\Excerpt;
+use Erusev\Parsedown\State;
+use PHPUnit\Framework\TestCase;
+
+final class EmphasisTest extends TestCase
+{
+    /**
+     * @return void
+     * @throws \PHPUnit\Framework\ExpectationFailedException
+     * @throws \SebastianBergmann\RecursionContext\InvalidArgumentException
+     */
+    public function testEmphasisAPI()
+    {
+        $Emphasis = Emphasis::build(new Excerpt('*foo*', 0), new State);
+
+        $this->assertSame('foo', $Emphasis->text());
+
+        $Emphasis = Emphasis::build(new Excerpt('**foo**', 0), new State);
+
+        $this->assertSame('foo', $Emphasis->text());
+    }
+}