chore(internal): add some tests for union classes (#542)

Author: stainless-app[bot]

lithic-java-core/src/test/kotlin/com/lithic/api/models/AccountHolderUpdateResponseTest.kt

@@ -0,0 +1,29 @@
+// File generated from our OpenAPI spec by Stainless.
+
+package com.lithic.api.models
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+
+internal class AccountHolderUpdateResponseTest {
+
+    @Test
+    fun ofKybKycPatch() {
+        val kybKycPatch = AccountHolderUpdateResponse.KybKycPatchResponse.builder().build()
+
+        val accountHolderUpdateResponse = AccountHolderUpdateResponse.ofKybKycPatch(kybKycPatch)
+
+        assertThat(accountHolderUpdateResponse.kybKycPatch()).contains(kybKycPatch)
+        assertThat(accountHolderUpdateResponse.patch()).isEmpty
+    }
+
+    @Test
+    fun ofPatch() {
+        val patch = AccountHolderUpdateResponse.PatchResponse.builder().build()
+
+        val accountHolderUpdateResponse = AccountHolderUpdateResponse.ofPatch(patch)
+
+        assertThat(accountHolderUpdateResponse.kybKycPatch()).isEmpty
+        assertThat(accountHolderUpdateResponse.patch()).contains(patch)
+    }
+}