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Testing Value Translation Component Calculations in CAT Monitoring System

This test suite validates the ValueTranslater component’s functionality in the CAT monitoring system, focusing on value scaling and transformation capabilities for graph generation. The tests verify accurate maximum value calculations across different numeric ranges.

Test Coverage Overview

The test suite provides comprehensive coverage of the ValueTranslater component’s value scaling functionality.

Key areas tested include:

Integer value ranges (100-1000 range)
Small integer values (1-5 range)
Decimal values (0.1-0.5 range)
Micro decimal values (0.01-0.25 range)

The tests verify accurate maximum value calculations across diverse numeric scales.

Implementation Analysis

The testing approach utilizes JUnit 4’s framework features with a component-based testing strategy. The implementation leverages ComponentTestCase for dependency injection and component lookup.

Key patterns include:

Parameterized test data using varargs
Precision-based floating point comparisons
Component lookup pattern for test isolation

Technical Details

Testing infrastructure includes:

JUnit 4 test runner
ComponentTestCase base class for DI support
Assert utilities for floating-point comparison
ValueTranslater component integration
Double precision comparison tolerance of 1e-6

Best Practices Demonstrated

The test suite exemplifies several testing best practices.

Notable implementations include:

Isolated test cases with clear input/output expectations
Proper handling of floating-point comparisons
Reusable test helper methods
Clear test data organization
Component-based architecture testing

dianping/cat

cat-home/src/test/java/com/dianping/cat/report/graph/ValueTranslaterTest.java

            
/*
 * Copyright (c) 2011-2018, Meituan Dianping. All Rights Reserved.
 *
 * 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.
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package com.dianping.cat.report.graph;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.unidal.lookup.ComponentTestCase;

import com.dianping.cat.report.graph.svg.ValueTranslater;

@RunWith(JUnit4.class)
public class ValueTranslaterTest extends ComponentTestCase {
	@Test
	public void test() throws Exception {
		check(1000, 123, 456, 247, 473, 976, 236);
		check(5, 1, 3, 5);
		check(0.5, 0.1, 0.3, 0.4);
		check(0.25, 0.01, 0.2, 0.1);

	}

	void check(double expected, double... values) throws Exception {
		ValueTranslater translater = lookup(ValueTranslater.class);

		Assert.assertEquals(expected, translater.getMaxValue(values), 1e-6);
	}
}