initial commit

- Added basic structure so tests won't error

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Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "kvs"
+version = "0.1.0"
+authors = ["Minh Tran <minh@minhtrannhat.com>"]
+edition = "2024"
+
+[dependencies]
+assert_cmd = "2.0.17"
+predicates = "3.1.3"

src/bin/kvs.rs

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

src/lib.rs

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+pub struct KvStore {}
+
+impl KvStore {
+    pub fn new() -> Self {
+        unimplemented!()
+    }
+
+    pub fn set(&mut self, key: String, value: String) {
+        unimplemented!()
+    }
+
+    pub fn get(&mut self, key: String) -> Option<String> {
+        unimplemented!()
+    }
+
+    pub fn remove(&mut self, key: String) {
+        unimplemented!()
+    }
+}
+
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}

tests/tests.rs

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+use assert_cmd::prelude::*;
+use kvs::KvStore;
+use predicates::str::contains;
+use std::process::Command;
+
+// `kvs` with no args should exit with a non-zero code.
+#[test]
+fn cli_no_args() {
+    Command::cargo_bin("kvs").unwrap().assert().failure();
+}
+
+// `kvs -V` should print the version
+#[test]
+fn cli_version() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["-V"])
+        .assert()
+        .stdout(contains(env!("CARGO_PKG_VERSION")));
+}
+
+// `kvs get <KEY>` should print "unimplemented" to stderr and exit with non-zero code
+#[test]
+fn cli_get() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["get", "key1"])
+        .assert()
+        .failure()
+        .stderr(contains("unimplemented"));
+}
+
+// `kvs set <KEY> <VALUE>` should print "unimplemented" to stderr and exit with non-zero code
+#[test]
+fn cli_set() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["set", "key1", "value1"])
+        .assert()
+        .failure()
+        .stderr(contains("unimplemented"));
+}
+
+// `kvs rm <KEY>` should print "unimplemented" to stderr and exit with non-zero code
+#[test]
+fn cli_rm() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["rm", "key1"])
+        .assert()
+        .failure()
+        .stderr(contains("unimplemented"));
+}
+
+#[test]
+fn cli_invalid_get() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["get"])
+        .assert()
+        .failure();
+
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["get", "extra", "field"])
+        .assert()
+        .failure();
+}
+
+#[test]
+fn cli_invalid_set() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["set"])
+        .assert()
+        .failure();
+
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["set", "missing_field"])
+        .assert()
+        .failure();
+
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["set", "extra", "extra", "field"])
+        .assert()
+        .failure();
+}
+
+#[test]
+fn cli_invalid_rm() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["rm"])
+        .assert()
+        .failure();
+
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["rm", "extra", "field"])
+        .assert()
+        .failure();
+}
+
+#[test]
+fn cli_invalid_subcommand() {
+    Command::cargo_bin("kvs")
+        .unwrap()
+        .args(&["unknown", "subcommand"])
+        .assert()
+        .failure();
+}
+
+// Should get previously stored value
+#[test]
+fn get_stored_value() {
+    let mut store = KvStore::new();
+
+    store.set("key1".to_owned(), "value1".to_owned());
+    store.set("key2".to_owned(), "value2".to_owned());
+
+    assert_eq!(store.get("key1".to_owned()), Some("value1".to_owned()));
+    assert_eq!(store.get("key2".to_owned()), Some("value2".to_owned()));
+}
+
+// Should overwrite existent value
+#[test]
+fn overwrite_value() {
+    let mut store = KvStore::new();
+
+    store.set("key1".to_owned(), "value1".to_owned());
+    assert_eq!(store.get("key1".to_owned()), Some("value1".to_owned()));
+
+    store.set("key1".to_owned(), "value2".to_owned());
+    assert_eq!(store.get("key1".to_owned()), Some("value2".to_owned()));
+}
+
+// Should get `None` when getting a non-existent key
+#[test]
+fn get_non_existent_value() {
+    let mut store = KvStore::new();
+
+    store.set("key1".to_owned(), "value1".to_owned());
+    assert_eq!(store.get("key2".to_owned()), None);
+}
+
+#[test]
+fn remove_key() {
+    let mut store = KvStore::new();
+
+    store.set("key1".to_owned(), "value1".to_owned());
+    store.remove("key1".to_owned());
+    assert_eq!(store.get("key1".to_owned()), None);
+}