diff --git a/src/test/java/org/codiki/core/services/ParserServiceTest.java b/src/test/java/org/codiki/core/services/ParserServiceTest.java
new file mode 100644
index 0000000..ce0e3c3
--- /dev/null
+++ b/src/test/java/org/codiki/core/services/ParserServiceTest.java
@@ -0,0 +1,330 @@
+package org.codiki.core.services;
+
+import org.apache.commons.lang.StringEscapeUtils;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ParserServiceTest {
+
+    private ParserService parserService;
+
+    @Before
+    public void setUp() {
+        parserService = new ParserService();
+    }
+
+    /* *********************************************************** */
+    /* H E A D E R S   P A R S I N G */
+    /* *********************************************************** */
+
+    @Test
+    public void testParseHeaders_h1() {
+        final String strInit = "[h1]Header[/h1]";
+        final String strExpected = "<h1>Header</h1>";
+
+        assertThat(parserService.parseHeaders(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseHeaders_h2() {
+        final String strInit = "[h2]Header[/h2]";
+        final String strExpected = "<h2>Header</h2>";
+
+        assertThat(parserService.parseHeaders(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseHeaders_h3() {
+        final String strInit = "[h3]Header[/h3]";
+        final String strExpected = "<h3>Header</h3>";
+
+        assertThat(parserService.parseHeaders(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseHeader_onlyCoupleOfTags() {
+        final String strInit = "[h1][h1]Test[/h1]";
+        final String strExpected = "[h1]<h1>Test</h1>";
+
+        assertThat(parserService.parseHeaders(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseHeader_multipleCouples() {
+        final String strInit = "[h1]Test1[/h1] [h1]Test2[/h1]";
+        final String strExpected = "<h1>Test1</h1> <h1>Test2</h1>";
+
+        assertThat(parserService.parseHeaders(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseHeaders() {
+        final String strInit = "[h1]Header1[/h1]\n" +
+                "                    Some text in header1\n" +
+                "                    [h2]Header2[/h2]\n" +
+                "                    Some text in header2\n" +
+                "                    [h3]Header3[/h3]\n" +
+                "                    Some text in header3\n" +
+                "                    [h3][h3]Header3[/h3]\n" +
+                "                    Some text in header3\n" +
+                "                    [h2]Header2[/h2]\n" +
+                "                    Some text in header2\n" +
+                "                    [h3]Header3[/h3][/h3]\n" +
+                "                    Some text in header3\n" +
+                "                    [h1]Header1[/h1]\n" +
+                "                    Some text in header1";
+
+        final String strExpected = "<h1>Header1</h1>\n" +
+                "                    Some text in header1\n" +
+                "                    <h2>Header2</h2>\n" +
+                "                    Some text in header2\n" +
+                "                    <h3>Header3</h3>\n" +
+                "                    Some text in header3\n" +
+                "                    [h3]<h3>Header3</h3>\n" +
+                "                    Some text in header3\n" +
+                "                    <h2>Header2</h2>\n" +
+                "                    Some text in header2\n" +
+                "                    <h3>Header3[/h3]</h3>\n" +
+                "                    Some text in header3\n" +
+                "                    <h1>Header1</h1>\n" +
+                "                    Some text in header1";
+
+        assertThat(parserService.parseHeaders(strInit)).isEqualTo(strExpected);
+    }
+
+    /* *********************************************************** */
+    /* B A C K   S P A C E S   P A R S I N G */
+    /* *********************************************************** */
+
+    @Test
+    public void testParseBackSpaces() {
+        final String strInit = "Hello\nworld!";
+        final String strExpected = "Hello<br/>world!";
+
+        assertThat(parserService.parseBackSpaces(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseBackSpaces_endTagCode() {
+        final String strInit = "[/code]\n\n";
+        final String strExpected = "[/code]\n";
+
+        assertThat(parserService.parseBackSpaces(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseBackSpaces_endTagCode_2() {
+        final String strInit = "[/code]\n";
+        final String strExpected = "[/code]<br/>";
+
+        assertThat(parserService.parseBackSpaces(strInit)).isEqualTo(strExpected);
+    }
+
+    /* *********************************************************** */
+    /* I M A G E S   P A R S I N G */
+    /* *********************************************************** */
+
+    @Test
+    public void testParseImages_simpleImg() {
+        final String strInit = StringEscapeUtils.escapeHtml("[img src=\"pathToImage\" /]");
+        final String strExpected = "<img src=\"pathToImage\" alt=\"\" />";
+
+        assertThat(parserService.parseImages(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseImages_subTagAlt() {
+        final String strInit = StringEscapeUtils.escapeHtml("[img src=\"pathToImage\" alt=\"alternative\" /]");
+        final String strExpected = "<img src=\"pathToImage\" alt=\"alternative\" />";
+
+        assertThat(parserService.parseImages(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseImages_multipleImages() {
+        final String strInit = StringEscapeUtils.escapeHtml("[img src=\"pathToImage1\" /]\n" +
+                "                    [img src=\"pathToImage2\" /]");
+        final String strExpected = "<img src=\"pathToImage1\" alt=\"\" />\n" +
+                "                    <img src=\"pathToImage2\" alt=\"\" />";
+
+        assertThat(parserService.parseImages(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseImages() {
+        final String strInit = StringEscapeUtils.escapeHtml("[img src=\"pathToImage1\" /]\n" +
+                "                    [img src=\"pathToImage2\" alt=\"alternativeOfImage2\" /]\n" +
+                "                    [img src=\"pathToImage3\" lgd=\"legendOfImage3\" /]\n" +
+                "                    [img src=\"pathToImage4\" alt=\"alternativeOfImage4\" lgd=\"legendOfImage4\" /]\n" +
+                "                    [img src=\"pathToImage5\" \" /]\n" +
+                "                    [img src=\"pathToImage6\" src=\"pathToImage6_2\" /]\n" +
+                "                    [img src=\"pathToImage7\" alt=\"alternativeOfImage7\" alt=\"alternativeOfImage7_2\" /]\n" +
+                "                    [img src=\"pathToImage8\" alt=\"legendOfImage8\" alt=\"legendOfImage8_2\" /]\n" +
+                "                    [img alt=\"alternativeOfImage9\" src=\"pathToImage9\" lgd=\"legendOfImage9\" /]\n" +
+                "                    [img lgd=\"legendOfImage10\" src=\"pathToImage10\" alt=\"alternativeOfImage10\" /]\n" +
+                "                    [img lgd=\"legendOfImage11\" alt=\"alternativeOfImage11\" src=\"pathToImage11\" /]");
+
+        final String strExpected = "<img src=\"pathToImage1\" alt=\"\" />\n" +
+                "                    <img src=\"pathToImage2\" alt=\"alternativeOfImage2\" />\n" +
+                "                    [img src=&quot;pathToImage3&quot; lgd=&quot;legendOfImage3&quot; /]\n" +
+                "                    [img src=&quot;pathToImage4&quot; alt=&quot;alternativeOfImage4&quot; lgd=&quot;legendOfImage4&quot; /]\n" +
+                "                    [img src=&quot;pathToImage5&quot; &quot; /]\n" +
+                "                    [img src=&quot;pathToImage6&quot; src=&quot;pathToImage6_2&quot; /]\n" +
+                "                    [img src=&quot;pathToImage7&quot; alt=&quot;alternativeOfImage7&quot; alt=&quot;alternativeOfImage7_2&quot; /]\n" +
+                "                    [img src=&quot;pathToImage8&quot; alt=&quot;legendOfImage8&quot; alt=&quot;legendOfImage8_2&quot; /]\n" +
+                "                    [img alt=&quot;alternativeOfImage9&quot; src=&quot;pathToImage9&quot; lgd=&quot;legendOfImage9&quot; /]\n" +
+                "                    [img lgd=&quot;legendOfImage10&quot; src=&quot;pathToImage10&quot; alt=&quot;alternativeOfImage10&quot; /]\n" +
+                "                    [img lgd=&quot;legendOfImage11&quot; alt=&quot;alternativeOfImage11&quot; src=&quot;pathToImage11&quot; /]";
+
+        assertThat(parserService.parseImages(strInit)).isEqualTo(strExpected);
+    }
+
+    /* *********************************************************** */
+    /* L I N K S   P A R S I N G */
+    /* *********************************************************** */
+
+    @Test
+    public void testParseLinks_simpleLink() {
+        final String strInit = StringEscapeUtils.escapeHtml("[link href=\"pathToLink\" txt=\"textOfLink\" /]");
+        final String strExpected = "<a href=\"pathToLink\">textOfLink</a>";
+
+        assertThat(parserService.parseLinks(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseLinks_multipleLinks() {
+        final String strInit = StringEscapeUtils.escapeHtml("[link href=\"pathToLink1\" txt=\"textOfLink1\" /]\n" +
+                "                    [link href=\"pathToLink2\" txt=\"textOfLink2\" /]");
+        final String strExpected = "<a href=\"pathToLink1\">textOfLink1</a>\n" +
+                "                    <a href=\"pathToLink2\">textOfLink2</a>";
+
+        assertThat(parserService.parseLinks(strInit)).isEqualTo(strExpected);
+    }
+
+    /* *********************************************************** */
+    /* C O D E   P A R S I N G */
+    /* *********************************************************** */
+
+    @Test
+    public void testParseCode_simpleCode() {
+        final String strInit = parserService.parseBackSpaces(StringEscapeUtils.escapeHtml("[code lg=\"python\"]\n" +
+                "def foo():\n" +
+                "    return \"Hello world!\"\n" +
+                "[/code]\n" +
+                "\n"));
+        final String strExpected = "<pre class=\"line-numbers\"><code class=\"language-python\">def foo():\n    return &quot;Hello world!&quot;\n</code></pre>";
+
+        assertThat(parserService.parseCode(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseCode_multipleCodes() {
+        final String strInit = parserService.parseBackSpaces(StringEscapeUtils.escapeHtml("[code lg=\"python\"]\n" +
+                "def foo():\n" +
+                "    return \"Hello world!\"\n" +
+                "[/code]\n" +
+                "\n" +
+                "[code lg=\"java\"]\n" +
+                "public static void main(final String... pArgs) {\n" +
+                "    System.out.println(\"Hello world!\");\n" +
+                "}\n" +
+                "[/code]\n" +
+                "\n"));
+        final String strExpected = "<pre class=\"line-numbers\"><code class=\"language-python\">def foo():\n    return &quot;Hello world!&quot;\n</code></pre><pre class=\"line-numbers\"><code class=\"language-java\">public static void main(final String... pArgs) {\n    System.out.println(&quot;Hello world!&quot;);\n}\n</code></pre>";
+
+        assertThat(parserService.parseCode(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseLinks_backSlashAndCodeParsing() {
+        final String strInit = parserService.parseBackSpaces(StringEscapeUtils.escapeHtml("[code lg=\"python\"]\n" +
+                "def foo():\n" +
+                "    return \"Hello world!\"\n" +
+                "[/code]\n" +
+                "\n"));
+        final String strExpected = "<pre class=\"line-numbers\"><code class=\"language-python\">def foo():\n    return &quot;Hello world!&quot;\n</code></pre>";
+
+        assertThat(parserService.parseCode(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParseLinks_backSlashAndCodeParsing_multiple() {
+        final String strInit = parserService.parseBackSpaces(StringEscapeUtils.escapeHtml("[code lg=\"python\"]\n" +
+                "def foo():\n" +
+                "    return \"Hello world!\"\n" +
+                "[/code]\n" +
+                "\n" +
+                "[code lg=\"java\"]\n" +
+                "public static void main(final String... pArgs) {\n" +
+                "    System.out.println(\"Hello world!\");\n" +
+                "}\n" +
+                "[/code]\n" +
+                "\n"));
+        final String strExpected = "<pre class=\"line-numbers\"><code class=\"language-python\">def foo():\n    return &quot;Hello world!&quot;\n</code></pre><pre class=\"line-numbers\"><code class=\"language-java\">public static void main(final String... pArgs) {\n    System.out.println(&quot;Hello world!&quot;);\n}\n</code></pre>";
+
+        assertThat(parserService.parseCode(strInit)).isEqualTo(strExpected);
+    }
+
+    @Test
+    public void testParse() {
+        final String strInit = "\n" +
+                "[h1]Title 1[/h1]\n" +
+                "[h2]Title 2[/h2]\n" +
+                "[h3]Title 3[/h3]\n" +
+                "Some text on multiple\n" +
+                "lines\n" +
+                "like\n" +
+                "here!\n" +
+                "\n" +
+                "[img src=\"pathToImage\" alt=\"alternativeOfImage\" /]\n" +
+                "\n" +
+                "[code lg=\"java\"]\n" +
+                "public static void main(final String... pArgs) {\n" +
+                "    System.out.println(\"Hello world!\");\n" +
+                "}\n" +
+                "[/code]\n" +
+                "\n" +
+                "\n" +
+                "[link href=\"pathToLink1\" txt=\"textOfLink1\" /]\n" +
+                "\n" +
+                "[img src=\"pathToImage2\" alt=\"alternativeOfImage2\" lgd=\"legendOfImage2\" /]\n" +
+                "[link href=\"pathToLink2\" txt=\"textOfLink2\" /]\n" +
+                "\n" +
+                "[code lg=\"python\"]\n" +
+                "def foo():\n" +
+                "    return \"Hello world!\"\n" +
+                "[/code]\n" +
+                "\n" +
+                "";
+
+        final String strExpected = "<br/>" +
+                "<h1>Title 1</h1><br/>" +
+                "<h2>Title 2</h2><br/>" +
+                "<h3>Title 3</h3><br/>" +
+                "Some text on multiple<br/>" +
+                "lines<br/>" +
+                "like<br/>" +
+                "here!<br/>" +
+                "<br/>" +
+                "<img src=\"pathToImage\" alt=\"alternativeOfImage\" /><br/>" +
+                "<br/>" +
+                "<pre class=\"line-numbers\"><code class=\"language-java\">" +
+                "public static void main(final String... pArgs) {\n" +
+                "    System.out.println(&quot;Hello world!&quot;);\n" +
+                "}\n" +
+                "</code></pre><br/>" +
+                "<a href=\"pathToLink1\">textOfLink1</a><br/>" +
+                "<br/>" +
+                "[img src=&quot;pathToImage2&quot; alt=&quot;alternativeOfImage2&quot; lgd=&quot;legendOfImage2&quot; /]<br/>" +
+                "<a href=\"pathToLink2\">textOfLink2</a><br/>" +
+                "<br/>" +
+                "<pre class=\"line-numbers\"><code class=\"language-python\">" +
+                "def foo():\n" +
+                "    return &quot;Hello world!&quot;\n" +
+                "</code></pre>";
+
+        assertThat(parserService.parse(strInit)).isEqualTo(strExpected);
+    }
+}