Updated test case to verify PR #974.

Author: lhazlewood

api/src/test/groovy/io/jsonwebtoken/lang/CollectionsTest.groovy

@@ -35,7 +35,7 @@ class CollectionsTest {
     @Test
     void testAsSetFromSet() {
         def set = Collections.setOf('foo')
-        assertSame set, Collections.asSet(set)
+        assertEquals set, Collections.asSet(set)
     }
 
     @Test
@@ -52,7 +52,7 @@ class CollectionsTest {
 
     @Test
     void testNullSafeSetWithNullArgument() {
-        def set = Collections.nullSafe((Set)null)
+        def set = Collections.nullSafe((Set) null)
         assertNotNull set
         assertTrue set.isEmpty()
     }
@@ -73,7 +73,7 @@ class CollectionsTest {
 
     @Test
     void testNullSafeCollectionWithNullArgument() {
-        Collection c = Collections.nullSafe((Collection)null)
+        Collection c = Collections.nullSafe((Collection) null)
         assertNotNull c
         assertTrue c.isEmpty()
     }