ch11.02 done

ch11/running-tests/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "running-tests"
+version = "0.1.0"

ch11/running-tests/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "running-tests"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

ch11/running-tests/src/lib.rs

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+// Can control which command line arguments go to
+// cargo test and which go to the actually binary itself
+// with the `--`. Before the `--` the args go to cargo test
+// then after go to the binary
+//
+// If want the fine-grained control over the number of
+// threads, use the --test-threads option.
+//   $ cargo test -- --test-threads=1
+
+fn prints_and_returns_10(a: i32) -> i32 {
+    println!("I got the value {a}");
+    10
+}
+
+pub fn add_two(a: usize) -> usize {
+    a + 2
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // by default tests capture stdout and wont print anything
+    // if want to see output, use the `--show-output flag`
+    //   $ cargo test -- --show-output
+    #[test]
+    fn this_test_will_pass() {
+        let value = prints_and_returns_10(4);
+        assert_eq!(value, 10);
+    }
+
+    // #[test]
+    // fn this_test_will_fail() {
+    //     let value = prints_and_returns_10(4);
+    //     assert_eq!(value, 5);
+    // }
+
+    // Can pass a string to `cargo test` to test all
+    // tests that contain said string.
+    //   $ cargo test add
+    // will test all functions that have `add` in the
+    // name.
+    #[test]
+    fn add_two_and_two() {
+        let result = add_two(2);
+        assert_eq!(result, 4);
+    }
+
+    #[test]
+    fn add_three_and_two() {
+        let result = add_two(3);
+        assert_eq!(result, 5);
+    }
+
+    // Can pass a single name to `cargo test` to test only
+    // a single function.
+    //   $ cargo test one_hundred
+    #[test]
+    fn one_hundred() {
+        let result = add_two(100);
+        assert_eq!(result, 102);
+    }
+
+    // Can tell rust to ignore specific tests unless requested
+    // Can choose to only run the ignored code with the
+    // `--ignored` flag
+    //   $ cargo test -- --ignored
+    #[test]
+    #[ignore]
+    fn expensive_test() {
+        assert!(true);
+    }
+}