Remove duplicated batchSize factor from target load; add a test case

CHANGELOG.adoc

@@ -15,6 +15,8 @@ toc::[]
 endif::[]
 == 0.5.2.8
 
+* fix: Fix target loading computation for inflight records
+
 === Fixes
 
 * fix: Fix equality and hash code for ShardKey with array key (#638), resolves (#579)

parallel-consumer-core/src/main/java/io/confluent/parallelconsumer/internal/AbstractParallelEoSStreamProcessor.java

@@ -997,8 +997,7 @@ protected int getTargetOutForProcessing() {
 
     protected int getQueueTargetLoaded() {
         //noinspection unchecked
-        int batch = options.getBatchSize();
-        return getPoolLoadTarget() * dynamicExtraLoadFactor.getCurrentFactor() * batch;
+        return getPoolLoadTarget() * dynamicExtraLoadFactor.getCurrentFactor();
     }
 
     /**

parallel-consumer-core/src/test/java/io/confluent/parallelconsumer/ParallelEoSStreamProcessorNonRunningTest.java

@@ -0,0 +1,46 @@
+package io.confluent.parallelconsumer;
+
+/*-
+ * Copyright (C) 2020-2023 Confluent, Inc.
+ */
+
+import io.confluent.parallelconsumer.internal.TestParallelEoSStreamProcessor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.OffsetResetStrategy;
+import org.apache.kafka.clients.consumer.MockConsumer;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests that the protected and internal methods of
+ * {@link io.confluent.parallelconsumer.internal.AbstractParallelEoSStreamProcessor} work as expected.
+ * <p>
+ *
+ * @author Jonathon Koyle
+ */
+@Slf4j
+class ParallelEoSStreamProcessorNonRunningTest {
+
+    /**
+     * Test that the mock consumer works as expected
+     */
+    @Test
+    void getTargetLoad() {
+        final int batchSize = 10;
+        final int concurrency = 2;
+        final MockConsumer<String, String> consumer = new MockConsumer<>(OffsetResetStrategy.LATEST);
+        final ParallelConsumerOptions<String, String> testOptions = ParallelConsumerOptions.<String, String>builder()
+                .batchSize(batchSize)
+                .maxConcurrency(concurrency)
+                .consumer(consumer)
+                .build();
+        try (final TestParallelEoSStreamProcessor<String, String> testInstance = new TestParallelEoSStreamProcessor<>(testOptions)) {
+            final int defaultLoad = 2;
+            final int expectedTargetLoad = batchSize * concurrency * defaultLoad;
+
+            final int actualTargetLoad = testInstance.getTargetLoad();
+
+            Assertions.assertEquals(expectedTargetLoad, actualTargetLoad);
+        }
+    }
+}

parallel-consumer-core/src/test/java/io/confluent/parallelconsumer/internal/TestParallelEoSStreamProcessor.java

@@ -0,0 +1,19 @@
+package io.confluent.parallelconsumer.internal;
+
+/*-
+ * Copyright (C) 2020-2023 Confluent, Inc.
+ */
+
+import io.confluent.parallelconsumer.ParallelConsumerOptions;
+
+/**
+ * Provides a set of methods for testing internal and configuration based interfaces of
+ * {@link AbstractParallelEoSStreamProcessor}.
+ */
+public class TestParallelEoSStreamProcessor<K, V> extends AbstractParallelEoSStreamProcessor<K, V> {
+    public TestParallelEoSStreamProcessor(final ParallelConsumerOptions<K, V> newOptions) {
+        super(newOptions);
+    }
+
+    public int getTargetLoad() { return getQueueTargetLoaded(); }
+}