fix test command execution

seems like i forgot that you actually need to run executables created
with `rustc --test`! this also reworks the "test1" exercise a bit

closes #108

exercises/test1.rs

@@ -5,16 +5,17 @@
 
 // Mary is buying apples. One apple usually costs 2 dollars, but if you buy
 // more than 40 at once, each apple only costs 1! Write a function that calculates
-// the price of an order of apples given the order amount.
+// the price of an order of apples given the order amount. No hints this time!
 
-fn main() {
+// Put your function here!
+// fn ..... {
+
+// Don't modify this function!
+#[test]
+fn verify_test() {
     let price1 = calculateprice(55);
     let price2 = calculateprice(40);
 
-    // Don't modify this!
-    if price1 == 55 && price2 == 80 {
-        println!("Good job!");
-    } else {
-        panic!("Uh oh! Wrong price!");
-    }
+    assert_eq!(price1, 55);
+    assert_eq!(price2, 80);
 }

src/verify.rs

@@ -14,7 +14,7 @@ pub fn verify() -> Result<(), ()> {
     compile_only("exercises/functions/functions3.rs")?;
     compile_only("exercises/functions/functions4.rs")?;
     compile_only("exercises/functions/functions5.rs")?;
-    compile_only("exercises/test1.rs")?;
+    test("exercises/test1.rs")?;
     compile_only("exercises/primitive_types/primitive_types1.rs")?;
     compile_only("exercises/primitive_types/primitive_types2.rs")?;
     compile_only("exercises/primitive_types/primitive_types3.rs")?;
@@ -87,19 +87,36 @@ pub fn test(filename: &str) -> Result<(), ()> {
         .args(&["--test", filename, "-o", "temp", "--color", "always"])
         .output()
         .expect("fail");
-    bar.finish_and_clear();
     if testcmd.status.success() {
+        bar.set_message(format!("Running {}...", filename).as_str());
+        let runcmd = Command::new("./temp").output().expect("fail");
+        bar.finish_and_clear();
+
+        if runcmd.status.success() {
             let formatstr = format!("{} Successfully tested {}!", Emoji("✅", "✓"), filename);
             println!("{}", style(formatstr).green());
             clean();
             Ok(())
         } else {
             let formatstr = format!(
-            "{} Testing of {} failed! Please try again.",
+                "{} Testing of {} failed! Please try again. Here's the output:",
                 Emoji("⚠️ ", "!"),
                 filename
             );
             println!("{}", style(formatstr).red());
+            println!("{}", String::from_utf8_lossy(&runcmd.stdout));
+            clean();
+            Err(())
+        }
+    } else {
+        bar.finish_and_clear();
+        let formatstr = format!(
+            "{} Compiling of {} failed! Please try again. Here's the output:",
+            Emoji("⚠️ ", "!"),
+            filename
+        );
+        println!("{}", style(formatstr).red());
+        println!("{}", String::from_utf8_lossy(&testcmd.stderr));
         clean();
         Err(())
     }