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| Add --version flag that prints the crate version and exits | 1 | use std::process::Command; |
| 2 | ||
| 3 | #[test] | |
| 4 | fn version_flag_prints_crate_version() { | |
| 5 | let output = Command::new(env!("CARGO_BIN_EXE_hello")) | |
| 6 | .arg("--version") | |
| 7 | .output() | |
| 8 | .unwrap(); | |
| 9 | assert!(output.status.success()); | |
| 10 | assert_eq!( | |
| 11 | String::from_utf8(output.stdout).unwrap(), | |
| 12 | format!("{}\n", env!("CARGO_PKG_VERSION")) | |
| 13 | ); | |
| 14 | } | |
| Add --times N flag that prints the greeting N times | 15 | |
| 16 | fn run(args: &[&str]) -> std::process::Output { | |
| 17 | Command::new(env!("CARGO_BIN_EXE_hello")) | |
| 18 | .args(args) | |
| 19 | .output() | |
| 20 | .unwrap() | |
| 21 | } | |
| 22 | ||
| 23 | #[test] | |
| 24 | fn times_prints_greeting_repeatedly() { | |
| 25 | let output = run(&["--times", "3", "Ada"]); | |
| 26 | assert!(output.status.success()); | |
| 27 | assert_eq!( | |
| 28 | String::from_utf8(output.stdout).unwrap(), | |
| 29 | "Hello, Ada!\n".repeat(3) | |
| 30 | ); | |
| 31 | } | |
| 32 | ||
| 33 | #[test] | |
| 34 | fn times_combines_with_shout() { | |
| 35 | let output = run(&["--times", "2", "--shout", "Ada"]); | |
| 36 | assert!(output.status.success()); | |
| 37 | assert_eq!( | |
| 38 | String::from_utf8(output.stdout).unwrap(), | |
| 39 | "HELLO, ADA!\n".repeat(2) | |
| 40 | ); | |
| 41 | } | |
| 42 | ||
| 43 | #[test] | |
| 44 | fn times_with_bad_value_fails() { | |
| 45 | let output = run(&["--times", "abc"]); | |
| 46 | assert!(!output.status.success()); | |
| 47 | assert!(!output.stderr.is_empty()); | |
| 48 | } |