Add basic tests in jest

Author: an0nusr

README.md

@@ -45,4 +45,8 @@ For ESM:
 ```js
 import parser from 'bbcode-parser-sax'
 return parser.parse(BBCODE_STRING)
-```
+```
+
+## Tests
+This package has a few basic tests to confirm the parser is working.
+Run `yarn test` to execute the tests. 

package.json

@@ -8,12 +8,18 @@
   "license": "MIT",
   "scripts": {
     "build-parser": "pegjs -o bbcode-parser.js grammar.pegjs",
-    "build": "yarn build-parser && parcel build"
+    "build": "yarn build-parser && parcel build",
+    "test": "jest"
   },
   "devDependencies": {
+    "jest": "^27.4.7",
     "parcel": "^2.2.1",
     "pegjs": "^0.10.0"
   },
-  "keywords": ["bbcode", "parser", "sax"],
+  "keywords": [
+    "bbcode",
+    "parser",
+    "sax"
+  ],
   "homepage": "https://github.com/an0nusr/bbcode-parser-sax"
 }

parser.test.js

@@ -0,0 +1,28 @@
+const { parse } = require("./bbcode-parser")
+
+test("check basic text parses without tags", () => {
+    let res = parse("I am text")
+    expect(res.length).toBe(1)
+    expect(res[0].type).toBe("text")
+    expect(res[0].text).toBe("I am text")
+})
+
+test("check basic tag functionality", () => {
+    let res = parse("[b]bold![/b]")
+    expect(res.length).toBe(3)
+    expect(res[0].type).toBe("startTag")
+    expect(res[0].tag.name).toBe("b")
+    expect(res[1].type).toBe("text")
+    expect(res[2].type).toBe("endTag")
+    expect(res[2].tag.name).toBe("b")
+})
+
+test("check tag attributes", () => {
+    let res = parse("[url=https://site.com?q=1]")
+    expect(res.length).toBe(1)
+    expect(res[0].type).toBe("startTag")
+    
+    let tag = res[0].tag
+    expect(tag.name).toBe("url")
+    expect(tag.value).toBe("https://site.com?q=1")
+})