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Testing FizzBuzz Algorithm Implementation in FizzBuzzEnterpriseEdition

This comprehensive test suite validates the FizzBuzz implementation using JUnit and Spring framework integration. The tests systematically verify the output sequence for numbers 1-16, ensuring correct ‘Fizz’, ‘Buzz’, and ‘FizzBuzz’ substitutions according to the classic rules.

Test Coverage Overview

The test suite provides thorough coverage of the FizzBuzz algorithm implementation:

Sequential testing from 1 to 16 with all key cases
Validation of Fizz (multiples of 3), Buzz (multiples of 5), and FizzBuzz (multiples of both)
Platform-independent output verification
Stream handling and output capture testing

Implementation Analysis

The testing approach utilizes Spring dependency injection and JUnit framework features:

Spring ApplicationContext for bean management
Custom output stream capture mechanism
Modular test structure with setUp/tearDown lifecycle methods
Platform-independent line separator handling

Technical Details

Testing infrastructure components:

JUnit 4 testing framework
Spring Framework for dependency injection
ByteArrayOutputStream for output capture
BufferedOutputStream for stream handling
TestConstants for centralized test data

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Proper test lifecycle management with @Before and @After annotations
Resource cleanup and system state restoration
Centralized test constants
Cross-platform compatibility considerations
Clear test method organization and naming

enterprisequalitycoding/fizzbuzzenterpriseedition

src/test/java/FizzBuzzTest.java

            
import static org.junit.Assert.assertEquals;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.seriouscompany.business.java.fizzbuzz.packagenamingpackage.interfaces.FizzBuzz;

/**
 * Tests for FizzBuzz
 */
public class FizzBuzzTest {

	private PrintStream out;
	private FizzBuzz fb;

	/**
	 * @return void
	 */
	@Before
	public void setUp() {
		final ApplicationContext context = new ClassPathXmlApplicationContext(TestConstants.SPRING_XML);
		this.fb = (FizzBuzz) context.getBean(TestConstants.STANDARD_FIZZ_BUZZ);
		this.out = System.out;
		((ConfigurableApplicationContext) context).close();
	}

	/**
	 * @return void
	 */
	@After
	public void tearDown() {
		System.setOut(this.out);
	}

	/**
	 * @param n int
	 * @param s String
	 * @throws IOException
	 */
	private void doFizzBuzz(final int n, final String s) throws IOException {
		final ByteArrayOutputStream baos = new ByteArrayOutputStream();
		final BufferedOutputStream bos = new BufferedOutputStream(baos);
		System.setOut(new PrintStream(bos));

		this.fb.fizzBuzz(n);

		System.out.flush();
		String platformDependentExpectedResult = s.replaceAll("\\n", System.getProperty("line.separator"));
		assertEquals(platformDependentExpectedResult, baos.toString());
	}

	/**
	 * @throws IOException
	 * @return void
	 */
	@Test
	public void testFizzBuzz() throws IOException {
		this.doFizzBuzz(TestConstants.INT_1, TestConstants._1_);
		this.doFizzBuzz(TestConstants.INT_2, TestConstants._1_2_);
		this.doFizzBuzz(TestConstants.INT_3, TestConstants._1_2_FIZZ);
		this.doFizzBuzz(TestConstants.INT_4, TestConstants._1_2_FIZZ_4);
		this.doFizzBuzz(TestConstants.INT_5, TestConstants._1_2_FIZZ_4_BUZZ);
		this.doFizzBuzz(TestConstants.INT_6, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ);
		this.doFizzBuzz(TestConstants.INT_7, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7);
		this.doFizzBuzz(TestConstants.INT_8, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8);
		this.doFizzBuzz(TestConstants.INT_9, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ);
		this.doFizzBuzz(TestConstants.INT_10, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ_BUZZ);
		this.doFizzBuzz(TestConstants.INT_11, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ_BUZZ_11);
		this.doFizzBuzz(TestConstants.INT_12, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ_BUZZ_11_FIZZ);
		this.doFizzBuzz(TestConstants.INT_13, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ_BUZZ_11_FIZZ_13);
		this.doFizzBuzz(TestConstants.INT_14, TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ_BUZZ_11_FIZZ_13_14);
		this.doFizzBuzz(TestConstants.INT_15,
				TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ_BUZZ_11_FIZZ_13_14_FIZZ_BUZZ);
		this.doFizzBuzz(TestConstants.INT_16,
				TestConstants._1_2_FIZZ_4_BUZZ_FIZZ_7_8_FIZZ_BUZZ_11_FIZZ_13_14_FIZZ_BUZZ_16);
	}

}