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exercises/ex01/Cargo.lock

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exercises/ex01/Cargo.toml

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+[package]
+name = "hello"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[dev-dependencies]
+assert_cmd = "1"

exercises/ex01/src/bin/false.rs

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+fn main() {
+  std::process::abort();
+}

exercises/ex01/src/bin/true.rs

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+fn main() {
+  std::process::exit(0);
+}

exercises/ex01/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

exercises/ex01/tests/cli.rs

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+use assert_cmd::Command;
+
+#[test]
+fn runs() {
+  let mut cmd = Command::cargo_bin("hello").unwrap();
+  cmd.assert().success().stdout("Hello, world!\n");
+}
+
+#[test]
+fn true_ok() {
+  let mut cmd = Command::cargo_bin("true").unwrap();
+  cmd.assert().success();
+}
+
+#[test]
+fn false_not_ok() {
+  let mut cmd = Command::cargo_bin("false").unwrap();
+  cmd.assert().failure();
+}