diff --git a/src/about_variables.rs b/src/about_variables.rs
index 4459509..4827dcf 100644
--- a/src/about_variables.rs
+++ b/src/about_variables.rs
@@ -1,20 +1,20 @@
 #[allow(dead_code)]
-mod about_variables {
-    pub fn guess_this () -> i32 {
-        let one = 5;
-        let two = 7;
-        let three = 3;
-        let result = (one + two) / three;
-        return result;
-    }
+pub fn guess_this () -> i32 {
+    let one = 5;
+    let two = 7;
+    let three = 3;
+    let result = (one + two) / three;
+    return result;
 }
 
-#[cfg(test)]
 mod tests {
-    use super::about_variables::*;
+    use super::*;
 
-    #[test]
-    fn test_complicated () {
-        assert_eq!(___, guess_this());
+    pub fn test_complicated () {
+        assert_eq!(1, guess_this());
     }
 }
+
+pub fn exec () {
+    tests::test_complicated();
+}
diff --git a/src/main.rs b/src/main.rs
index abbd3b8..c3ca53c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,7 +2,34 @@
 extern crate ansi_term;
 
 use quicli::prelude::*;
-use ansi_term::Colour::{Red, Yellow};
+use ansi_term::Colour::{Red, Yellow, Green};
+
+macro_rules! verify {
+    ( $str:expr, $left:expr, $right:expr ) => {
+        if ($left == $right) {
+            println!("{} {}", Green.bold().paint("PASS"), $str);
+        } else {
+            println!("{} {}", Red.bold().paint("FAIL"), $str);
+            println!("\tYou submitted {}, but that's not correct!", $left);
+            println!("\tPlease correct your code to make this test pass!");
+        }
+    }
+}
+
+macro_rules! verify_easy {
+    ( $str:expr, $left:expr, $right:expr ) => {
+        if ($left == $right) {
+            println!("{} {}", Green.bold().paint("PASS"), $str);
+        } else {
+            println!("{} {}", Red.bold().paint("FAIL"), $str);
+            println!("\tExpected: {}", $right);
+            println!("\tGot: {}", $left);
+            println!("\tPlease correct your code to make this test pass!");
+        }
+    }
+}
+
+mod about_variables;
 
 #[derive(Debug, StructOpt)]
 struct Cli {
@@ -10,12 +37,10 @@ struct Cli {
 }
 
 main!(|args: Cli| {
-    match args.exercise {
-        Some(e) => {
-            println!("selected {}", e);
-        }
-        None => {
-            println!("Welcome to {}", Yellow.paint("Rustlings"));
-        }
+    if let Some(e) = args.exercise {
+        println!("selected {}", e);
+    } else {
+        println!("Welcome to {}", Yellow.paint("rustlings"));
+        verify!("One equals one", 1, 2);
     }
 });