feat: add more test coverage

Cargo.toml

@@ -8,6 +8,8 @@ edition = "2021"
 [dependencies]
 clap = { version = "4.3.15", features = ["derive"] }
 dirs = "5.0.1"
+mockall = "0.11.4"
 serde = { version = "1.0.171", features = ["derive"] }
 serde_json = "1.0.103"
+tempfile = "3.7.0"
 termion = "2.0.1"

src/args.rs

@@ -0,0 +1,14 @@
+use clap::Parser;
+
+/// cli typing test
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+pub struct Args {
+    /// duration of the test in seconds
+    #[arg(short, long)]
+    pub duration: Option<u16>,
+
+    /// indicates if test should include numbers
+    #[arg(short, long)]
+    pub numbers: Option<bool>,
+}