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exercises/01_intro/00_welcome/src/lib.rs

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+// This is a Rust file. It is a plain text file with a `.rs` extension.
+//
+// Like most modern programming languages, Rust supports comments. You're looking at one right now!
+// Comments are ignored by the compiler; you can leverage them to annotate code with notes and
+// explanations.
+// There are various ways to write comments in Rust, each with its own purpose.
+// For now we'll stick to the most common one: the line comment.
+// Everything from `//` to the end of the line is considered a comment.
+
+// Exercises will include `TODO`, `todo!()` or `__` markers to draw your attention to the lines
+// where you need to write code.
+// You'll need to replace these markers with your own code to complete the exercise.
+// Sometimes it'll be enough to write a single line of code, other times you'll have to write
+// longer sections.
+//
+// If you get stuck for more than 10 minutes on an exercise, grab a trainer! We're here to help!
+// You can also find solutions to all exercises in the `solutions` git branch.
+fn greeting() -> &'static str {
+    // TODO: fix me 👇
+    "I'm ready to learn Rust!"
+}
+
+// Your solutions will be automatically verified by a set of tests.
+// You can run these tests directly by invoking the `cargo test` command in your terminal,
+// from the root of this exercise's directory. That's what the `wr` command does for you
+// under the hood.
+//
+// Rust lets you write tests alongside your code.
+// The `#[cfg(test)]` attribute tells the compiler to only compile the code below when
+// running tests (i.e. when you run `cargo test`).
+// You'll learn more about attributes and testing later in the course.
+// For now, just know that you need to look for the `#[cfg(test)]` attribute to find the tests
+// that will be verifying the correctness of your solutions!
+//
+// ⚠️ **DO NOT MODIFY THE TESTS** ⚠️
+// They are there to help you validate your solutions. You should only change the code that's being
+// tested, not the tests themselves.
+#[cfg(test)]
+mod tests {
+    use crate::greeting;
+
+    #[test]
+    fn test_welcome() {
+        assert_eq!(greeting(), "I'm ready to learn Rust!");
+    }
+}