feat!: wrap Client::new() return in a Result

BREAKING CHANGE: `Client::new()` now returns a `Result`.

tests/v1_client_chat_test.rs

@@ -7,7 +7,7 @@ use mistralai_client::v1::{
 
 #[test]
 fn test_client_chat() {
-    let client = Client::new(None, None, None, None);
+    let client = Client::new(None, None, None, None).unwrap();
 
     let model = Model::OpenMistral7b;
     let messages = vec![ChatCompletionMessage {

tests/v1_client_embeddings_test.rs

@@ -3,7 +3,7 @@ use mistralai_client::v1::{client::Client, constants::EmbedModel};
 
 #[test]
 fn test_client_embeddings() {
-    let client: Client = Client::new(None, None, None, None);
+    let client: Client = Client::new(None, None, None, None).unwrap();
 
     let model = EmbedModel::MistralEmbed;
     let input = vec!["Embed this sentence.", "As well as this one."]

tests/v1_client_list_models_test.rs

@@ -3,7 +3,7 @@ use mistralai_client::v1::client::Client;
 
 #[test]
 fn test_client_list_models() {
-    let client = Client::new(None, None, None, None);
+    let client = Client::new(None, None, None, None).unwrap();
 
     let response = client.list_models().unwrap();
 

tests/v1_client_new_test.rs

@@ -1,5 +1,5 @@
 use jrest::expect;
-use mistralai_client::v1::client::Client;
+use mistralai_client::v1::{client::Client, error::ClientError};
 
 #[test]
 fn test_client_new_with_none_params() {
@@ -7,7 +7,7 @@ fn test_client_new_with_none_params() {
     std::env::remove_var("MISTRAL_API_KEY");
     std::env::set_var("MISTRAL_API_KEY", "test_api_key_from_env");
 
-    let client = Client::new(None, None, None, None);
+    let client = Client::new(None, None, None, None).unwrap();
 
     expect!(client.api_key).to_be("test_api_key_from_env".to_string());
     expect!(client.endpoint).to_be("https://api.mistral.ai/v1".to_string());
@@ -38,7 +38,8 @@ fn test_client_new_with_all_params() {
         endpoint.clone(),
         max_retries.clone(),
         timeout.clone(),
-    );
+    )
+    .unwrap();
 
     expect!(client.api_key).to_be(api_key.unwrap());
     expect!(client.endpoint).to_be(endpoint.unwrap());
@@ -54,12 +55,16 @@ fn test_client_new_with_all_params() {
 }
 
 #[test]
-#[should_panic]
 fn test_client_new_with_missing_api_key() {
     let maybe_original_mistral_api_key = std::env::var("MISTRAL_API_KEY").ok();
     std::env::remove_var("MISTRAL_API_KEY");
 
-    let _client = Client::new(None, None, None, None);
+    let call = || Client::new(None, None, None, None);
+
+    match call() {
+        Ok(_) => panic!("Expected `ClientError::ApiKeyError` but got Ok.`"),
+        Err(error) => assert_eq!(error, ClientError::ApiKeyError),
+    }
 
     match maybe_original_mistral_api_key {
         Some(original_mistral_api_key) => {