Test getProvider() is Apache Commons Collections.

src/main/java/org/apache/commons/collections4/bloomfilter/hasher/function/MD5Cyclic.java

@@ -59,7 +59,8 @@ public final class MD5Cyclic implements HashFunction {
         try {
             messageDigest = MessageDigest.getInstance(NAME);
         } catch (final NoSuchAlgorithmException e) {
-            throw new IllegalStateException(e.getMessage());
+            // This should not happen
+            throw new IllegalStateException("Missing the standard MD5 message digest algorithm", e);
         }
         signature = apply(HashFunctionIdentity.prepareSignatureBuffer(this), 0);
     }

src/test/java/org/apache/commons/collections4/bloomfilter/hasher/function/MD5CyclicTest.java

@@ -58,5 +58,6 @@ public class MD5CyclicTest {
             md5.getProcessType());
         final long expected = md5.apply(arg.getBytes(StandardCharsets.UTF_8), 0);
         assertEquals(expected, md5.getSignature());
+        assertEquals("Apache Commons Collections", md5.getProvider());
     }
 }

src/test/java/org/apache/commons/collections4/bloomfilter/hasher/function/Murmur128x86CyclicTest.java

@@ -60,5 +60,6 @@ public class Murmur128x86CyclicTest {
             murmur.getProcessType());
         final long expected = murmur.apply(arg.getBytes(StandardCharsets.UTF_8), 0);
         assertEquals(expected, murmur.getSignature());
+        assertEquals("Apache Commons Collections", murmur.getProvider());
     }
 }

src/test/java/org/apache/commons/collections4/bloomfilter/hasher/function/Murmur32x86IterativeTest.java

@@ -58,5 +58,6 @@ public class Murmur32x86IterativeTest {
             murmur.getProcessType());
         final long expected = murmur.apply(arg.getBytes(StandardCharsets.UTF_8), 0);
         assertEquals(expected, murmur.getSignature());
+        assertEquals("Apache Commons Collections", murmur.getProvider());
     }
 }

src/test/java/org/apache/commons/collections4/bloomfilter/hasher/function/ObjectsHashIterativeTest.java

@@ -63,5 +63,6 @@ public class ObjectsHashIterativeTest {
         final long expected2 = obj.apply(arg.getBytes(StandardCharsets.UTF_8), 0);
         assertEquals(expected, expected2);
         assertEquals(expected, obj.getSignature());
+        assertEquals("Apache Commons Collections", obj.getProvider());
     }
 }