test: add first integration test

Author: replydev

Cargo.lock

@@ -58,3 +58,4 @@ globset = "0.4.16"
 
 [dev-dependencies]
 assert_cmd = "2.0.17"
+predicates = "3.1.3"

Cargo.toml

@@ -0,0 +1,16 @@
+use assert_cmd::Command;
+use predicates::str::is_match;
+
+#[test]
+fn test_version_subcommand() {
+    // Arrange / Act
+    let assertion = Command::cargo_bin("cotp")
+        .unwrap()
+        .arg("--version")
+        .assert();
+
+    // Assert
+    assertion
+        .success()
+        .stdout(is_match("^cotp \\d+\\.\\d+\\.\\d+-DEBUG-.+").unwrap());
+}