diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/sim/TestSimUtils.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/sim/TestSimUtils.java
new file mode 100644
index 00000000000..b2d4bea9d76
--- /dev/null
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/sim/TestSimUtils.java
@@ -0,0 +1,95 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.solr.cloud.autoscaling.sim;
+
+import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.client.solrj.SolrRequest;
+import org.apache.solr.client.solrj.request.V2Request;
+import org.apache.solr.common.params.SolrParams;
+import org.junit.Test;
+
+/**
+ *
+ */
+public class TestSimUtils extends SolrTestCaseJ4 {
+
+  @Test
+  public void testV2toV1() throws Exception {
+    // valid patterns
+
+    V2Request req = new V2Request.Builder("/c/myCollection")
+        .withMethod(SolrRequest.METHOD.POST)
+        .withPayload("{'add-replica':{'shard':'shard2','node':'node1:1234','type':'TLOG'}}")
+        .withParams(params("foo", "bar"))
+        .build();
+    SolrParams params = SimUtils.v2AdminRequestToV1Params(req);
+    assertEquals("/admin/collections", params.get("path"));
+    assertEquals("myCollection", params.get("collection"));
+    assertEquals("bar", params.get("foo"));
+    assertEquals("addreplica", params.get("action"));
+    assertEquals("shard2", params.get("shard"));
+    assertEquals("node1:1234", params.get("node"));
+    assertEquals("TLOG", params.get("type"));
+
+    req = new V2Request.Builder("/c/myCollection/shards/shard1")
+        .withMethod(SolrRequest.METHOD.POST)
+        .withPayload("{'add-replica':{'shard':'shard2','node':'node1:1234','type':'TLOG'}}")
+        .build();
+    params = SimUtils.v2AdminRequestToV1Params(req);
+    assertEquals("/admin/collections", params.get("path"));
+    assertEquals("myCollection", params.get("collection"));
+    // XXX should path parameters override the payload, or the other way around?
+    assertEquals("shard1", params.get("shard"));
+
+    req = new V2Request.Builder("/c/myCollection/shards/shard1/core_node5")
+        .withMethod(SolrRequest.METHOD.POST)
+        .withPayload("{'deletereplica':{}}")
+        .build();
+    params = SimUtils.v2AdminRequestToV1Params(req);
+    assertEquals("/admin/collections", params.get("path"));
+    assertEquals("myCollection", params.get("collection"));
+    // XXX should path parameters override the payload, or the other way around?
+    assertEquals("shard1", params.get("shard"));
+    assertEquals("core_node5", params.get("replica"));
+
+    // invalid patterns
+    req = new V2Request.Builder("/invalid/myCollection")
+        .withMethod(SolrRequest.METHOD.POST)
+        .withPayload("{'add-replica':{'shard':'shard2','node':'node1:1234','type':'TLOG'}}")
+        .withParams(params("foo", "bar"))
+        .build();
+    try {
+      params = SimUtils.v2AdminRequestToV1Params(req);
+    } catch (UnsupportedOperationException e) {
+      // expected
+      assertTrue(e.toString(), e.toString().contains("request path"));
+    }
+
+    req = new V2Request.Builder("/collections/myCollection/foobar/xyz")
+        .withMethod(SolrRequest.METHOD.POST)
+        .withPayload("{'add-replica':{'shard':'shard2','node':'node1:1234','type':'TLOG'}}")
+        .withParams(params("foo", "bar"))
+        .build();
+    try {
+      params = SimUtils.v2AdminRequestToV1Params(req);
+    } catch (UnsupportedOperationException e) {
+      // expected
+      assertTrue(e.toString(), e.toString().contains("expected 'shards'"));
+    }
+  }
+}