added tests4

tasks requires user to ignore a testcase

exercises/17_tests/tests4.rs

@@ -0,0 +1,11 @@
+fn main() {}
+
+#[cfg(test)]
+mod tests {
+    //TODO make sure this test does not run 
+    #[test]
+    fn ignore_test() {
+        // Do not change this line
+        panic!("The test wasn't ignored");
+    }
+}

rustlings-macros/info.toml

@@ -868,6 +868,17 @@ To handle that, you need to add a special attribute to the test function.
 You can refer to the docs:
 https://doc.rust-lang.org/book/ch11-01-writing-tests.html#checking-for-panics-with-should_panic"""
 
+[[exercises]]
+name = "tests4"
+dir = "17_tests"
+hint = """ 
+The test always panics, so we need a way to simply ignore it.
+
+For this, similarly to the exercise tests3, we can add a special attribute to the test function. 
+
+You can refer to the docs: 
+https://doc.rust-lang.org/book/ch11-02-running-tests.html#ignoring-tests-unless-specifically-requested
+"""
 # STANDARD LIBRARY TYPES
 
 [[exercises]]

solutions/17_tests/tests4.rs

@@ -0,0 +1,11 @@
+fn main() {}
+
+#[cfg(test)]
+mod tests {
+
+    #[test]
+    #[ignore] //this line simply ignores the test
+    fn ignore_test() {
+        panic!("The test wasn't ignored");
+    }
+}