From 95827a49c27d17cccf0f908d2e629ee0152abc51 Mon Sep 17 00:00:00 2001
From: "Elijah C. M. Voigt" <elijah.caine.mv@gmail.com>
Date: Wed, 2 Oct 2019 06:35:03 -0700
Subject: [PATCH] Rust tests for `var x` and `let x` default to undefined

---
 .gitignore      |  6 +++++-
 src/lib/exec.rs | 29 +++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index b7bb3b00d4d..c6fae6041d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,10 @@
 .idea/
 *.iml
 
+# Vim
+.*.swp
+.*.swo
+
 # Build
 target
 dist
@@ -9,4 +13,4 @@ dist
 node_modules
 .DS_Store
 yarn-error.log
-.vscode/settings.json
\ No newline at end of file
+.vscode/settings.json
diff --git a/src/lib/exec.rs b/src/lib/exec.rs
index b9b776ecbab..ceb7d9e07e0 100644
--- a/src/lib/exec.rs
+++ b/src/lib/exec.rs
@@ -630,3 +630,32 @@ impl Interpreter {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::exec;
+
+    #[test]
+    fn empty_let_decl_undefined() {
+        let scenario = r#"
+        let a;
+        a == undefined;
+        "#;
+
+        let pass = String::from("true");
+
+        assert_eq!(exec(scenario), pass);
+    }
+
+    #[test]
+    fn empty_var_decl_undefined() {
+        let scenario = r#"
+        let b;
+        b == undefined;
+        "#;
+
+        let pass = String::from("true");
+
+        assert_eq!(exec(scenario), pass);
+    }
+}