Adding examples, how to check shell prompt etc.

hw6/task2/src/unit_tests_shell.rs

@@ -0,0 +1,55 @@
+#[cfg(test)]
+mod test {
+    use shell::Shell;
+
+    #[test]
+    fn test_prompt_in_memory_with_string() {
+        let input = b"echo";
+        let mut output = Vec::new();
+
+        let mut shell = Shell {
+            reader: &input[..],
+            writer: &mut output,
+            should_exit: false,
+            name: "bsys-shell".to_string(),
+        };
+
+        let output = shell.prompt().unwrap().unwrap();
+
+        assert_eq!("echo", output);
+    }
+
+    #[test]
+    fn test_loop_of_shell_which_wants_to_exit() {
+        let input = b"BlaBla";
+        let mut output = Vec::new();
+
+        let mut shell = Shell {
+            reader: &input[..],
+            writer: &mut output,
+            should_exit: true,
+            name: "bsys-shell".to_string(),
+        };
+
+        let output = shell.start().unwrap();
+
+        assert_eq!((), output);
+    }
+
+    #[test]
+    fn test_loop_with_exit_command() {
+        let input = b"exit";
+        let mut output = Vec::new();
+
+        let mut shell = Shell {
+            reader: &input[..],
+            writer: &mut output,
+            should_exit: false,
+            name: "bsys-shell".to_string(),
+        };
+
+        let output = shell.start().unwrap();
+
+        assert_eq!((), output);
+    }
+}