Add more tests 😆

src/repl.rs

@@ -61,13 +61,13 @@ impl Repl {
                 self.loop_body.push_str(&user_input[index..]);
                 self.loop_depth = 1;
                 user_input = user_input[..index].to_string();
-            },
+            }
             Some(_) => {
                 self.loop_body.push_str(&user_input);
                 user_input.matches('[').for_each(|_| self.loop_depth += 1);
                 user_input.matches(']').for_each(|_| self.loop_depth -= 1);
                 return;
-            },
+            }
             _ => {
                 if user_input.contains(']') {
                     if self.loop_depth == 0 {
@@ -360,4 +360,67 @@ mod tests {
             repl.process(line);
         }
     }
+
+    #[test]
+    fn print_my_first_name_in_one_command() {
+        let interpreter = Interpreter::new(
+            10,
+            vec![],
+        );
+
+        let mut repl = Repl::new(interpreter);
+
+        let code = "++++++++[>++++[>++<-]>>>>>>++[<<<->>>-]<<<<<<<-]>>+.<<++++[>+++
+        [>+++<-]>++<<-]>>+.<<+++[>+++[>-<-]>-<<-]>>-.<<++++++[>>+++<<-]>>.".to_string();
+
+        repl.process(code);
+    }
+
+    #[test]
+    fn print_hello_world() {
+        let interpreter = Interpreter::new(
+            10,
+            vec![],
+        );
+
+        let mut repl = Repl::new(interpreter);
+
+        let _ = "[ This program prints \"Hello World!\" and a newline to the screen, its
+                length is 106 active command characters. [It is not the shortest.]
+                ]
+                ++++++++               Set Cell #0 to 8
+                [
+                    >++++               Add 4 to Cell #1; this will always set Cell #1 to 4
+                    [                   as the cell will be cleared by the loop
+                        >++             Add 2 to Cell #2
+                        >+++            Add 3 to Cell #3
+                        >+++            Add 3 to Cell #4
+                        >+              Add 1 to Cell #5
+                        <<<<-           Decrement the loop counter in Cell #1
+                    ]                   Loop until Cell #1 is zero; number of iterations is 4
+                    >+                  Add 1 to Cell #2
+                    >+                  Add 1 to Cell #3
+                    >-                  Subtract 1 from Cell #4
+                    >>+                 Add 1 to Cell #6
+                    [<]                 Move back to the first zero cell you find; this will
+                        be Cell #1 which was cleared by the previous loop
+                    <-                  Decrement the loop Counter in Cell #0
+                ]                       Loop until Cell #0 is zero; number of iterations is 8
+
+                The result of this is:
+                Cell no :   0   1   2   3   4   5   6
+                Contents:   0   0  72 104  88  32   8
+                Pointer :   ^
+
+                >>.                     Cell #2 has value 72 which is 'H'
+                >---.                   Subtract 3 from Cell #3 to get 101 which is 'e'
+                +++++++..+++.           Likewise for 'llo' from Cell #3
+                >>.                     Cell #5 is 32 for the space
+                <-.                     Subtract 1 from Cell #4 for 87 to give a 'W'
+                <.                      Cell #3 was set to 'o' from the end of 'Hello'
+                +++.------.--------.    Cell #3 for 'rl' and 'd'
+                >>+.                    Add 1 to Cell #5 gives us an exclamation point
+                >++.                    And finally a newline from Cell #6
+            ".to_string().split("\n").for_each(|s| repl.process(s.to_string()));
+    }
 }