Add drone configuration

README.md

@@ -60,7 +60,7 @@ Read [this guide](https://git-send-email.io) for more information.
 - [x] Better documentation
 - [ ] Ability to explicitly print math output and assign math output to variables
 - [x] Add support for comments (should be pretty easy)
-- [ ] Unit testing and CI/CD
+- [x] Unit testing and CI/CD
 
 ## License
 

drone.yml

@@ -0,0 +1,22 @@
+kind: pipeline
+type: docker
+name: rust-latest
+
+steps:
+- name: test
+  image: rust:1.49.0
+  commands:
+  - cargo build --verbose
+  - cargo test --verbose
+
+---
+kind: pipeline
+type: docker
+name: rust-nightly
+
+steps:
+- name: test
+  image: rustlang/rust:nightly
+  commands:
+  - cargo build --verbose
+  - cargo test --verbose

src/main.rs

@@ -128,3 +128,30 @@ fn main() {
     let mut prog = Program::from_string(contents);
     prog.run();
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn make_program(contents: &str) -> Program {
+        Program::from_string(contents.to_string())
+    }
+
+    #[test]
+    fn test_math() {
+        assert_eq!(eval::do_math("2-2".to_string(), '+'), 4);
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_undefined_opcode() {
+        make_program("Hello\nWorld!").run();
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_undefined_variable() {
+        make_program("p$v").run();
+    }
+
+}