fix: added unit tests

__tests__/examples/freemarker-tags/document.html

@@ -0,0 +1 @@
+<#if a>

__tests__/examples/freemarker-tags/errors.js

@@ -0,0 +1,15 @@
+module.exports = [
+  {
+    "col": 1,
+    "evidence": "<#if a>",
+    "line": 1,
+    "message": "Conditional [<#if a>] is missing a closing tag: [</#if>]",
+    "raw": "<#if a>",
+    "rule": {
+      "description": "Validate Freemarker tags.",
+      "id": "freemarker-tags",
+      "link": "https://thecapsule.email/docs/codes/freemarker-tags",
+    },
+    "type": "error",
+  }
+]

__tests__/freemarker.spec.ts

@@ -0,0 +1,45 @@
+import { parse } from '../src/parser';
+
+test('that the following freemarker syntax will parse', () => {
+    expect(parse('before<#if a></#if>after')).toEqual([
+        'before',
+        '<#if a>',
+        '</#if>',
+        'after'
+    ]);
+
+    expect(parse('<#if a>b></#if>')).toEqual([
+        '<#if a>',
+        'b>',
+        '</#if>'
+    ]);
+
+    expect(parse('<#if (a>b)></#if>')).toEqual([
+        '<#if (a>b)>',
+        '</#if>'
+    ]);
+
+    expect(parse('<#if (a>b)><#if (b>d)>inner</#if></#if>')).toEqual([
+        '<#if (a>b)>',
+        '<#if (b>d)>',
+        'inner',
+        '</#if>',
+        '</#if>'
+    ]);
+
+    expect(parse('before${Recipient.unsubscribe()}after')).toEqual([
+        'before',
+        '${Recipient.unsubscribe()}',
+        'after'
+    ]);
+
+    expect(parse('${foo.bar() + Recipient.unsubscribe()}')).toEqual([
+        '${foo.bar() + Recipient.unsubscribe()}'
+    ]);
+
+    expect(parse('<#if a + b == c < 3 + d()>inner</#if>')).toEqual([
+        '<#if a + b == c < 3 + d()>',
+        'inner',
+        '</#if>'
+    ]);
+})

__tests__/rules.spec.ts

@@ -93,4 +93,10 @@ describe('Rule: "valid-path-format"', () => {
     it('Throws errors for relative paths.', () => {
         rule('valid-path-format');
     });
+});
+
+describe('Rule: "freemarker-tags"', () => {
+    it('Throws errors for invalid freemarker tags.', () => {
+        rule('freemarker-tags');
+    });
 });