diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index a7ad9ffd15..0398f3beb7 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -17,6 +17,21 @@
                 "kind": "build",
                 "isDefault": true
             }
+        },
+        {
+            "type": "cargo",
+            "label": "cargo Test",
+            "command": "cargo",
+            "args": [
+                "test"
+            ],
+            "problemMatcher": [
+                "$rustc"
+            ],
+            "group": {
+                "kind": "test",
+                "isDefault": true
+            }
         }
     ]
 }
\ No newline at end of file
diff --git a/src/bin/bin.rs b/src/bin/bin.rs
index fa84b5c8a3..f7f5e36cc5 100644
--- a/src/bin/bin.rs
+++ b/src/bin/bin.rs
@@ -3,9 +3,8 @@ use js::syntax::lexer::Lexer;
 use std::fs::read_to_string;
 
 pub fn main() {
-    let buffer = read_to_string("test.js").unwrap();
+    let buffer = read_to_string("tests/js/defineVar.js").unwrap();
     let mut lexer = Lexer::new(&buffer);
     lexer.lex().expect("finished");
     println!("{:?}", lexer.tokens);
-    println!("Hello World");
 }
diff --git a/test.js b/test.js
deleted file mode 100644
index de896e4235..0000000000
--- a/test.js
+++ /dev/null
@@ -1 +0,0 @@
-let a = (2 * 2);
\ No newline at end of file
diff --git a/tests/js/defineVar.js b/tests/js/defineVar.js
new file mode 100644
index 0000000000..0f504264f5
--- /dev/null
+++ b/tests/js/defineVar.js
@@ -0,0 +1 @@
+console.log("hello world");
\ No newline at end of file
diff --git a/tests/lexer_test.rs b/tests/lexer_test.rs
new file mode 100644
index 0000000000..7274220a07
--- /dev/null
+++ b/tests/lexer_test.rs
@@ -0,0 +1,23 @@
+extern crate js;
+use js::syntax::ast::keyword::Keyword;
+use js::syntax::ast::punc::Punctuator;
+use js::syntax::ast::token::TokenData;
+use js::syntax::lexer::Lexer;
+
+#[test]
+/// Check basic variable definition tokens
+fn check_variable_definition_tokens() {
+    let s = &String::from("let a = 'hello';");
+    let mut lexer = Lexer::new(s);
+    lexer.lex().expect("finished");
+    assert_eq!(lexer.tokens[0].data, TokenData::Keyword(Keyword::Let));
+    assert_eq!(lexer.tokens[1].data, TokenData::Identifier("a".to_string()));
+    assert_eq!(
+        lexer.tokens[2].data,
+        TokenData::Punctuator(Punctuator::Assign)
+    );
+    assert_eq!(
+        lexer.tokens[3].data,
+        TokenData::StringLiteral("hello".to_string())
+    );
+}