Add decode() tests.

src/lib.rs

@@ -149,6 +149,7 @@ mod tests {
         return byte_arrays;
     }
 
+    // encode() tests.
     #[test]
     fn should_encode_empty_vector_correctly() {
         let actual = encode(&vec![]);
@@ -169,14 +170,32 @@ mod tests {
         }
     }
 
+    // decode() tests.
     #[test]
-    fn encode_empty_string_should_return_empty_string() {
-        let bytes: Vec<u8> = String::from("").into_bytes();
-        let actual: String = encode(&bytes);
-        assert!(actual.len() == 0);
-        assert!(actual == "");
+    fn decode_empty_string_should_return_empty_vector() {
+        let actual: Vec<u8> = decode(&String::from(""));
+        assert_eq!(actual, []);
     }
 
+    #[test]
+    fn decode_should_decode_base64_strings_correctly() {
+        let base64_strings = get_base64_strings();
+        let plain_strings = get_plain_strings();
+
+        let mut i: usize = 0;
+        while i < base64_strings.len() {
+            let test_string = &base64_strings[i];
+            let actual: String = match String::from_utf8(decode(&test_string)) {
+                Ok(s) => s,
+                Err(e) => panic!("Invalid utf-8 sequence: {:?}", e),
+            };
+
+            assert_eq!(actual, plain_strings[i]);
+            i = i + 1;
+        }
+    }
+
+    // Helper function tests.
     #[test]
     fn get_number_of_pads_should_return_zero() {
         let test_vec = String::from("Foo").into_bytes();