Copilot commented on code in PR #5878:
URL: https://github.com/apache/texera/pull/5878#discussion_r3449346168


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common/workflow-operator/src/test/scala/org/apache/texera/amber/operator/machineLearning/sklearnAdvanced/base/HyperParametersSpec.scala:
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@@ -0,0 +1,82 @@
+/*
+ * 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.amber.operator.machineLearning.sklearnAdvanced.base
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import org.apache.texera.amber.util.JSONUtils.objectMapper
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class HyperParametersSpec extends AnyFlatSpec with Matchers {
+
+  "HyperParameters" should
+    "default parameter/attribute/value to null and parametersSource to false" 
in {
+    val h = new HyperParameters[String]
+    h.parameter shouldBe null
+    h.attribute shouldBe null
+    h.value shouldBe null
+    h.parametersSource shouldBe false
+  }
+
+  it should "allow all fields to be assigned post-construction" in {
+    val h = new HyperParameters[String]
+    h.parameter = "alpha"
+    h.attribute = "colA"
+    h.value = "0.5"
+    h.parametersSource = true
+    h.parameter shouldBe "alpha"
+    h.attribute shouldBe "colA"
+    h.value shouldBe "0.5"
+    h.parametersSource shouldBe true
+  }
+
+  "HyperParameters" should "expose attribute and value under their 
@JsonProperty wire-keys" in {
+    classOf[HyperParameters[_]]
+      .getDeclaredField("attribute")
+      .getAnnotation(classOf[JsonProperty])
+      .value shouldBe "attribute"
+    classOf[HyperParameters[_]]
+      .getDeclaredField("value")
+      .getAnnotation(classOf[JsonProperty])
+      .value shouldBe "value"
+  }

Review Comment:
   The test is using Java reflection on the Scala compiler–generated backing 
fields to assert `@JsonProperty` values. This is brittle (annotation target 
placement can differ across Scala/Jackson configurations) and doesn’t actually 
validate the JSON wire format. Prefer asserting on serialized JSON keys instead.



##########
common/workflow-operator/src/test/scala/org/apache/texera/amber/operator/machineLearning/Scorer/MachineLearningScorerOpDescSpec.scala:
##########
@@ -0,0 +1,89 @@
+/*
+ * 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.amber.operator.machineLearning.Scorer
+
+import org.apache.texera.amber.core.tuple.{Attribute, AttributeType, Schema}
+import org.apache.texera.amber.operator.LogicalOp
+import org.apache.texera.amber.operator.metadata.OperatorGroupConstants
+import org.apache.texera.amber.util.JSONUtils.objectMapper
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class MachineLearningScorerOpDescSpec extends AnyFlatSpec with Matchers {
+
+  "MachineLearningScorerOpDesc.operatorInfo" should
+    "advertise the name and Machine Learning General group" in {
+    val info = (new MachineLearningScorerOpDesc).operatorInfo
+    info.userFriendlyName shouldBe "Machine Learning Scorer"
+    info.operatorDescription shouldBe "Scorer for machine learning models"
+    info.operatorGroupName shouldBe 
OperatorGroupConstants.MACHINE_LEARNING_GENERAL_GROUP
+    info.inputPorts should have length 1
+    info.outputPorts should have length 1
+  }
+
+  "MachineLearningScorerOpDesc" should "default isRegression false and the 
column fields to empty" in {
+    val d = new MachineLearningScorerOpDesc
+    d.isRegression shouldBe false
+    d.actualValueColumn shouldBe ""
+    d.predictValueColumn shouldBe ""
+    d.classificationMetrics shouldBe empty
+    d.regressionMetrics shouldBe empty
+  }
+
+  "MachineLearningScorerOpDesc.getOutputSchemas" should
+    "include a Class column for classification with no metrics" in {
+    val d = new MachineLearningScorerOpDesc
+    d.getOutputSchemas(Map.empty) shouldBe Map(
+      d.operatorInfo.outputPorts.head.id -> Schema(
+        List(new Attribute("Class", AttributeType.STRING))
+      )
+    )
+  }
+
+  it should "produce an empty schema for regression with no metrics" in {
+    val d = new MachineLearningScorerOpDesc
+    d.isRegression = true
+    val out = d.getOutputSchemas(Map.empty)
+    out.keySet shouldBe Set(d.operatorInfo.outputPorts.head.id)
+    out(d.operatorInfo.outputPorts.head.id).getAttributes shouldBe empty
+  }
+
+  "MachineLearningScorerOpDesc.generatePythonCode" should "emit the scorer 
table operator" in {
+    val d = new MachineLearningScorerOpDesc
+    d.actualValueColumn = "y"
+    d.predictValueColumn = "yhat"
+    val code = d.generatePythonCode()
+    code should include("class ProcessTableOperator(UDFTableOperator)")
+    code should include("from sklearn.metrics import")
+  }

Review Comment:
   This test sets `actualValueColumn`/`predictValueColumn`, but the assertions 
only check for the operator class and sklearn import. Adding a couple of 
assertions that the generated code actually references the configured columns 
would better pin the contract and catch regressions in the template 
interpolation.



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