Add HashCodeBindHashTest

ebean-core/src/test/java/io/ebeaninternal/server/querydefn/HashCodeBindHashTest.java

@@ -0,0 +1,37 @@
+package io.ebeaninternal.server.querydefn;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class HashCodeBindHashTest {
+
+  @Test
+  public void update_with_null() {
+
+    HashCodeBindHash hash = new HashCodeBindHash();
+    hash.update(1).update(null).update("hello");
+
+    HashCodeBindHash hash2 = new HashCodeBindHash();
+    hash2.update(1).update(null).update("hello");
+
+    assertThat(hash).isEqualTo(hash2);
+  }
+
+  @Test
+  public void notEqual() {
+
+    HashCodeBindHash hash = new HashCodeBindHash();
+    hash.update(1).update(null).update("hello");
+
+    HashCodeBindHash hash2 = new HashCodeBindHash();
+    hash2.update(1).update("hello");
+
+    HashCodeBindHash hash3 = new HashCodeBindHash();
+    hash2.update(1).update(null);
+
+    assertThat(hash).isNotEqualTo(hash2);
+    assertThat(hash).isNotEqualTo(hash3);
+    assertThat(hash2).isNotEqualTo(hash3);
+  }
+}