Add tests to prevent regressions in downloading type definitions

src/cli/cli.rs

@@ -8,6 +8,9 @@ use lune::Lune;
 
 use crate::utils::{files::find_parse_file_path, github::Client as GithubClient};
 
+const LUNE_SELENE_FILE_NAME: &str = "lune.yml";
+const LUNE_LUAU_FILE_NAME: &str = "luneTypes.d.luau";
+
 /// Lune CLI
 #[derive(Parser, Debug, Default)]
 #[command(author, version, about, long_about = None)]
@@ -29,8 +32,8 @@ pub struct Cli {
     download_luau_types: bool,
 }
 
+#[allow(dead_code)]
 impl Cli {
-    #[allow(dead_code)]
     pub fn from_path<S>(path: S) -> Self
     where
         S: Into<String>,
@@ -41,7 +44,6 @@ impl Cli {
         }
     }
 
-    #[allow(dead_code)]
     pub fn from_path_with_args<S, A>(path: S, args: A) -> Self
     where
         S: Into<String>,
@@ -54,6 +56,20 @@ impl Cli {
         }
     }
 
+    pub fn download_selene_types() -> Self {
+        Self {
+            download_selene_types: true,
+            ..Default::default()
+        }
+    }
+
+    pub fn download_luau_types() -> Self {
+        Self {
+            download_luau_types: true,
+            ..Default::default()
+        }
+    }
+
     pub async fn run(self) -> Result<ExitCode> {
         // Download definition files, if wanted
         let download_types_requested = self.download_selene_types || self.download_luau_types;
@@ -66,14 +82,14 @@ impl Cli {
             if self.download_selene_types {
                 println!("Downloading Selene type definitions...");
                 client
-                    .fetch_release_asset(&release, "lune.yml")
+                    .fetch_release_asset(&release, LUNE_SELENE_FILE_NAME)
                     .await
                     .map_err(LuaError::external)?;
             }
             if self.download_luau_types {
                 println!("Downloading Luau type definitions...");
                 client
-                    .fetch_release_asset(&release, "luneTypes.d.luau")
+                    .fetch_release_asset(&release, LUNE_LUAU_FILE_NAME)
                     .await
                     .map_err(LuaError::external)?;
             }
@@ -108,3 +124,47 @@ impl Cli {
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{Cli, LUNE_LUAU_FILE_NAME, LUNE_SELENE_FILE_NAME};
+    use anyhow::{bail, Result};
+    use serde_json::Value;
+    use smol::fs::{create_dir_all, read_to_string};
+    use std::env::set_current_dir;
+
+    async fn run_cli(cli: Cli) -> Result<()> {
+        create_dir_all("bin").await?;
+        set_current_dir("bin")?;
+        cli.run().await?;
+        Ok(())
+    }
+
+    #[test]
+    fn download_selene_types() -> Result<()> {
+        smol::block_on(async {
+            run_cli(Cli::download_selene_types()).await?;
+            match read_to_string(LUNE_SELENE_FILE_NAME).await {
+                Ok(file_contents) => match serde_json::from_str::<Value>(&file_contents) {
+                    Err(_) => Ok(()),
+                    Ok(_) => bail!("Downloading selene definitions returned json, expected luau"),
+                },
+                Err(_) => bail!("Failed to download selene definitions!"),
+            }
+        })
+    }
+
+    #[test]
+    fn download_luau_types() -> Result<()> {
+        smol::block_on(async {
+            run_cli(Cli::download_luau_types()).await?;
+            match read_to_string(LUNE_LUAU_FILE_NAME).await {
+                Ok(file_contents) => match serde_json::from_str::<Value>(&file_contents) {
+                    Err(_) => Ok(()),
+                    Ok(_) => bail!("Downloading luau definitions returned json, expected luau"),
+                },
+                Err(_) => bail!("Failed to download luau definitions!"),
+            }
+        })
+    }
+}