Suppress warnings when cargo test --no-default-features (#289)

Author: giraffate

tests/ecdsa/mod.rs

@@ -1,8 +1,12 @@
 use jsonwebtoken::{
     crypto::{sign, verify},
-    decode, encode, Algorithm, DecodingKey, EncodingKey, Header, Validation,
+    Algorithm, DecodingKey, EncodingKey,
 };
 use serde::{Deserialize, Serialize};
+
+#[cfg(feature = "use_pem")]
+use jsonwebtoken::{decode, encode, Header, Validation};
+#[cfg(feature = "use_pem")]
 use time::OffsetDateTime;
 
 #[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize)]

tests/eddsa/mod.rs

@@ -1,8 +1,12 @@
 use jsonwebtoken::{
     crypto::{sign, verify},
-    decode, encode, Algorithm, DecodingKey, EncodingKey, Header, Validation,
+    Algorithm, DecodingKey, EncodingKey,
 };
 use serde::{Deserialize, Serialize};
+
+#[cfg(feature = "use_pem")]
+use jsonwebtoken::{decode, encode, Header, Validation};
+#[cfg(feature = "use_pem")]
 use time::OffsetDateTime;
 
 #[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize)]

tests/rsa/mod.rs

@@ -1,8 +1,12 @@
 use jsonwebtoken::{
     crypto::{sign, verify},
-    decode, encode, Algorithm, DecodingKey, EncodingKey, Header, Validation,
+    Algorithm, DecodingKey, EncodingKey,
 };
 use serde::{Deserialize, Serialize};
+
+#[cfg(feature = "use_pem")]
+use jsonwebtoken::{decode, encode, Header, Validation};
+#[cfg(feature = "use_pem")]
 use time::OffsetDateTime;
 
 const RSA_ALGORITHMS: &[Algorithm] = &[