Minor doc updates. Added a test case.

src/main/java/io/jsonwebtoken/ExpiredJwtException.java

@@ -26,6 +26,13 @@ public class ExpiredJwtException extends ClaimJwtException {
         super(header, claims, message);
     }
 
+    /**
+     * @param header jwt header
+     * @param claims jwt claims (body)
+     * @param message exception message
+     * @param cause cause
+     * @since 0.5
+     */
     public ExpiredJwtException(Header header, Claims claims, String message, Throwable cause) {
         super(header, claims, message, cause);
     }

src/main/java/io/jsonwebtoken/PrematureJwtException.java

@@ -26,7 +26,13 @@ public class PrematureJwtException extends ClaimJwtException {
         super(header, claims, message);
     }
 
-    @SuppressWarnings("UnusedDeclaration")
+    /**
+     * @param header jwt header
+     * @param claims jwt claims (body)
+     * @param message exception message
+     * @param cause cause
+     * @since 0.5
+     */
     public PrematureJwtException(Header header, Claims claims, String message, Throwable cause) {
         super(header, claims, message, cause);
     }

src/test/groovy/io/jsonwebtoken/SignatureAlgorithmTest.groovy

@@ -76,4 +76,14 @@ class SignatureAlgorithmTest {
         }
     }
 
+    @Test
+    void testIsJdkStandard() {
+        for(SignatureAlgorithm alg : SignatureAlgorithm.values()) {
+            if (alg.name().startsWith("ES") || alg.name().startsWith("PS") || alg == SignatureAlgorithm.NONE) {
+                assertFalse alg.isJdkStandard()
+            } else {
+                assertTrue alg.isJdkStandard()
+            }
+        }
+    }
 }