Add some more unit tests

_tests/class.md

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+---
+---
+
+{% capture markdown %}
+# Heading 1
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text class="awesome-toc-class" %}
+
+<!-- /// -->
+
+<ul class="awesome-toc-class">
+    <li><a href="#heading-1">Heading 1</a></li>
+</ul>

_tests/id.md

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+---
+# Test the 'id' attribute correctly assigns the ID to the generated TOC
+---
+
+{% capture markdown %}
+# Heading 1
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text id="Jekyll-TOC" %}
+
+<!-- /// -->
+
+<ul id="Jekyll-TOC">
+    <li><a href="#heading-1">Heading 1</a></li>
+</ul>

_tests/maximumHeadings.md

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+---
+# Given h_max is defined, it should only use headings less than or equal to this value
+---
+
+{% capture markdown %}
+# Heading 1
+
+## Heading 2.1
+
+### Heading 3
+
+#### Heading 4
+
+## Heading 2.2
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text h_max=2 %}
+
+<!-- /// -->
+
+<ul>
+    <li>
+        <a href="#heading-1">Heading 1</a>
+        <ul>
+            <li><a href="#heading-21">Heading 2.1</a></li>
+            <li><a href="#heading-22">Heading 2.2</a></li>
+        </ul>
+    </li>
+</ul>

_tests/minAndMaxHeadings.md

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+---
+# Given h_min and h_max are both defined, the TOC should respect both
+---
+
+{% capture markdown %}
+# Heading 1
+
+## Heading 2.1
+
+### Heading 3
+
+#### Heading 4.1
+
+#### Heading 4.2
+
+##### Heading 5
+
+## Heading 2.2
+
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text h_min=2 h_max=4 %}
+
+<!-- /// -->
+
+<ul>
+    <li>
+        <a href="#heading-21">Heading 2.1</a>
+        <ul>
+            <li>
+                <a href="#heading-3">Heading 3</a>
+                <ul>
+                    <li><a href="#heading-41">Heading 4.1</a></li>
+                    <li><a href="#heading-42">Heading 4.2</a></li>
+                </ul>
+            </li>
+        </ul>
+    </li>
+    <li><a href="#heading-22">Heading 2.2</a></li>
+</ul>

_tests/minimumHeadings.md

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+---
+# Given h_min is defined, it should only use headings greater than or equal to this value
+---
+
+{% capture markdown %}
+# Heading 1
+
+## Heading 2.1
+
+### Heading 3
+
+#### Heading 4
+
+## Heading 2.2
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text h_min=2 %}
+
+<!-- /// -->
+
+<ul>
+    <li>
+        <a href="#heading-21">Heading 2.1</a>
+        <ul>
+            <li>
+                <a href="#heading-3">Heading 3</a>
+                <ul>
+                    <li><a href="#heading-4">Heading 4</a></li>
+                </ul>
+            </li>
+        </ul>
+    </li>
+    <li><a href="#heading-22">Heading 2.2</a></li>
+</ul>

_tests/multiple-classes.md

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+---
+# Supporting multiple classes for the TOC works by concatenating them with periods
+---
+
+{% capture markdown %}
+# Heading 1
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text class="first-class.second-class" %}
+
+<!-- /// -->
+
+<ul class="first-class second-class">
+    <li><a href="#heading-1">Heading 1</a></li>
+</ul>

_tests/noHeadings.md

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+---
+# Given a markdown block with no headings, no TOC will be generated
+---
+
+{% capture markdown %}
+Some **awesome** markdown that doesn't have any headings
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+<div id="unit-test">
+{% include toc.html html=text id="Jekyll-TOC" %}
+</div>
+
+<!-- /// -->
+
+<div id="unit-test">
+
+</div>

_tests/sanitizeDisabled.md

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+---
+# Given `sanitize` is set to false, any HTML from headings should remain
+---
+
+{% capture markdown %}
+# Heading 1
+
+## `Heading` 2.1
+
+### Heading **3**
+
+#### Heading _4_
+
+## Heading 2.2
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text sanitize=false %}
+
+<!-- /// -->
+
+<ul>
+    <li>
+        <a href="#heading-1">Heading 1</a>
+        <ul>
+            <li>
+                <a href="#heading-21"><code class="highlighter-rouge">Heading</code> 2.1</a>
+                <ul>
+                    <li>
+                        <a href="#heading-3">Heading <strong>3</strong></a>
+                        <ul>
+                            <li><a href="#heading-4">Heading <em>4</em></a></li>
+                        </ul>
+                    </li>
+                </ul>
+            </li>
+            <li><a href="#heading-22">Heading 2.2</a></li>
+        </ul>
+    </li>
+</ul>

_tests/sanitizeEnabled.md

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+---
+# Given `sanitize` is set to true, any HTML in the TOC should be stripped
+---
+
+{% capture markdown %}
+# Heading 1
+
+## `Heading` 2.1
+
+### Heading **3**
+
+#### Heading _4_
+
+## Heading 2.2
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text sanitize=true %}
+
+<!-- /// -->
+
+<ul>
+    <li>
+        <a href="#heading-1">Heading 1</a>
+        <ul>
+            <li>
+                <a href="#heading-21">Heading 2.1</a>
+                <ul>
+                    <li>
+                        <a href="#heading-3">Heading 3</a>
+                        <ul>
+                            <li><a href="#heading-4">Heading 4</a></li>
+                        </ul>
+                    </li>
+                </ul>
+            </li>
+            <li><a href="#heading-22">Heading 2.2</a></li>
+        </ul>
+    </li>
+</ul>