test: add property testing to Crc32cCombineGoogle (#1440)

Co-authored-by: BenWhitehead <BenWhitehead@users.noreply.github.com>

google-cloud-storage/src/test/java/com/google/cloud/storage/Crc32cUtilityPropertyTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.cloud.storage;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.hash.Hashing;
+import net.jqwik.api.ForAll;
+import net.jqwik.api.Property;
+
+public class Crc32cUtilityPropertyTest {
+  @Property
+  public void testCrc32cCombinePropertyTest(
+      @ForAll byte[] firstObject, @ForAll byte[] secondObject) {
+    int firstPartHash = Hashing.crc32c().hashBytes(firstObject).asInt();
+    int secondPartHash = Hashing.crc32c().hashBytes(secondObject).asInt();
+    int expected =
+        Hashing.crc32c().newHasher().putBytes(firstObject).putBytes(secondObject).hash().asInt();
+    int actual =
+        Crc32cUtility.crc32cCombineGoogle(firstPartHash, secondPartHash, secondObject.length);
+    assertThat(actual).isEqualTo(expected);
+  }
+}