feat: Add a --nocapture option to display test harnesses' outputs

This new feature can be accessed by invoking rustlings with --nocapture.

Both unit and integration tests added.

closes #262

BREAKING CHANGES:
The following function take a new boolean argument:
	* `run`
	* `verify`
	* `test`
	* `compile_and_test`

1 files changed, 22 insertions, 0 deletions

diff --git a/tests/integration_tests.rs b/tests/integration_tests.rs
index 683e564..0f49b5a 100644
--- a/tests/integration_tests.rs
+++ b/tests/integration_tests.rs
@@ -159,3 +159,25 @@ fn run_test_exercise_does_not_prompt() {
         .code(0)
         .stdout(predicates::str::contains("I AM NOT DONE").not());
 }
+
+#[test]
+fn run_single_test_success_with_output() {
+    Command::cargo_bin("rustlings")
+        .unwrap()
+        .args(&["--nocapture", "r", "testSuccess"])
+        .current_dir("tests/fixture/success/")
+        .assert()
+        .code(0)
+        .stdout(predicates::str::contains("THIS TEST TOO SHALL PAS"));
+}
+
+#[test]
+fn run_single_test_success_without_output() {
+    Command::cargo_bin("rustlings")
+        .unwrap()
+        .args(&["r", "testSuccess"])
+        .current_dir("tests/fixture/success/")
+        .assert()
+        .code(0)
+        .stdout(predicates::str::contains("THIS TEST TOO SHALL PAS").not());
+}
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