test(amber): cover computing unit worker args

amber/src/test/scala/org/apache/texera/web/ComputingUnitWorkerSpec.scala

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+/*
+ * 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.texera.web
+
+import org.apache.commons.jcs3.access.exception.InvalidArgumentException
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class ComputingUnitWorkerSpec extends AnyFlatSpec with Matchers {
+
+  "parseArgs" should "return no options when the worker receives no arguments" in {
+    ComputingUnitWorker.parseArgs(Array.empty[String]) shouldBe Map.empty
+  }
+
+  it should "parse the worker server address without changing its value" in {
+    ComputingUnitWorker.parseArgs(Array("--serverAddr", "worker.internal:8090")) shouldBe
+      Map(Symbol("serverAddr") -> "worker.internal:8090")
+  }
+
+  it should "use the last server address when the option is repeated" in {
+    ComputingUnitWorker.parseArgs(
+      Array("--serverAddr", "first:8080", "--serverAddr", "last:9090")
+    ) shouldBe
+      Map(Symbol("serverAddr") -> "last:9090")
+  }
+
+  it should "reject an unknown command-line option" in {
+    val exception = intercept[InvalidArgumentException] {
+      ComputingUnitWorker.parseArgs(Array("--cluster", "true"))
+    }
+
+    exception.getMessage shouldBe "unknown command-line arg"
+  }
+
+  it should "reject a server address option with no value" in {
+    val exception = intercept[InvalidArgumentException] {
+      ComputingUnitWorker.parseArgs(Array("--serverAddr"))
+    }
+
+    exception.getMessage shouldBe "unknown command-line arg"
+  }
+}