diff --git a/src/formatting.rs b/src/formatting.rs
index dad87e5..dcb740f 100644
--- a/src/formatting.rs
+++ b/src/formatting.rs
@@ -49,23 +49,6 @@ pub fn pretty_eval(input: &str, max_digits: usize) -> Result<String, Error> {
     )
     .replace('e', " * 10^"))
 }
-#[test]
-fn test_character_readdition() {
-    assert_eq!(pretty_eval(" = 11", 10).unwrap(), " = 11");
-    assert_eq!(pretty_eval(" &= 11", 10).unwrap(), " & = 11");
-    assert_eq!(pretty_eval(" & 11", 10).unwrap(), " & 11");
-    assert_eq!(pretty_eval(" & 11 \\", 10).unwrap(), " & 11 \\");
-}
-#[test]
-fn test_basic_up_to_999() {
-    assert_eq!(pretty_eval("1", 10).unwrap(), "1");
-    assert_eq!(pretty_eval("10", 10).unwrap(), "10");
-    assert_eq!(pretty_eval("100", 10).unwrap(), "100");
-    assert_eq!(pretty_eval("999", 10).unwrap(), "999");
-    assert_eq!(pretty_eval("1000", 10).unwrap(), "1 * 10^3");
-
-    assert_eq!(pretty_eval("11.111111", 10).unwrap(), "11.111111");
-}
 
 pub fn get_significant_digits(n: &Float) -> usize {
     let raw_string = n.to_string().replace('.', "");
@@ -101,23 +84,45 @@ pub fn get_significant_digits(n: &Float) -> usize {
 }
 
 #[cfg(test)]
-fn eval(s: &str) -> Float {
-    crate::nodes::eval(s).unwrap()
-}
+mod tests {
+    use super::*;
+    fn eval(s: &str) -> Float {
+        crate::nodes::eval(s).unwrap()
+    }
 
-#[test]
-fn test_get_significant_digits() {
-    let many_zeros = eval("14.00643 + 1.00784 * 4 + 35.446 + 15.9994 * 4");
-    assert_eq!(many_zeros.to_f64(), 117.48139);
-    let many_nines = eval("12.0096 + 15.9994 * 2");
-    assert_eq!(many_nines.to_f64(), 44.0084);
-    let zero_nine_zero = eval("2+12321(5+123)");
-    assert_eq!(zero_nine_zero.to_f64(), 1577090.0);
-    let test_4 = eval("12.0096 + 1.00784 * 3 + 12.0096 + 1.00784 * 2 + 15.9994 + 1.00784");
-    assert_eq!(test_4.to_f64(), 46.06564);
+    #[test]
+    fn character_readdition() {
+        assert_eq!(pretty_eval(" = 11", 10).unwrap(), " = 11");
+        assert_eq!(pretty_eval(" &= 11", 10).unwrap(), " & = 11");
+        assert_eq!(pretty_eval(" & 11", 10).unwrap(), " & 11");
+        assert_eq!(pretty_eval(" & 11 \\", 10).unwrap(), " & 11 \\");
+    }
 
-    assert_eq!(get_significant_digits(&many_zeros), 8);
-    assert_eq!(get_significant_digits(&many_nines), 6);
-    assert_eq!(get_significant_digits(&zero_nine_zero), 6);
-    assert_eq!(get_significant_digits(&test_4), 7);
+    #[test]
+    fn basic_output_up_to_999() {
+        assert_eq!(pretty_eval("1", 10).unwrap(), "1");
+        assert_eq!(pretty_eval("10", 10).unwrap(), "10");
+        assert_eq!(pretty_eval("100", 10).unwrap(), "100");
+        assert_eq!(pretty_eval("999", 10).unwrap(), "999");
+        assert_eq!(pretty_eval("1000", 10).unwrap(), "1 * 10^3");
+
+        assert_eq!(pretty_eval("11.111111", 10).unwrap(), "11.111111");
+    }
+
+    #[test]
+    fn basic_get_significant_digits() {
+        let many_zeros = eval("14.00643 + 1.00784 * 4 + 35.446 + 15.9994 * 4");
+        assert_eq!(many_zeros.to_f64(), 117.48139);
+        let many_nines = eval("12.0096 + 15.9994 * 2");
+        assert_eq!(many_nines.to_f64(), 44.0084);
+        let zero_nine_zero = eval("2+12321(5+123)");
+        assert_eq!(zero_nine_zero.to_f64(), 1577090.0);
+        let test_4 = eval("12.0096 + 1.00784 * 3 + 12.0096 + 1.00784 * 2 + 15.9994 + 1.00784");
+        assert_eq!(test_4.to_f64(), 46.06564);
+
+        assert_eq!(get_significant_digits(&many_zeros), 8);
+        assert_eq!(get_significant_digits(&many_nines), 6);
+        assert_eq!(get_significant_digits(&zero_nine_zero), 6);
+        assert_eq!(get_significant_digits(&test_4), 7);
+    }
 }