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Testing HystrixProperty Chain Resolution in Netflix Hystrix

This test suite validates the HystrixProperty class functionality in Netflix’s Hystrix library, focusing on property chaining, default values, and null handling. The tests ensure proper behavior of nested property configurations and property value resolution.

Test Coverage Overview

The test suite provides comprehensive coverage of HystrixProperty functionality:

Nested property value resolution
Default value handling
Null property chains
Multiple property series evaluation

Tests verify both simple and complex property chaining scenarios, ensuring robust property value resolution.

Implementation Analysis

The testing approach utilizes JUnit’s assertion framework to validate property value resolution:

Factory method testing for property creation
Nested property chain validation
Series-based property resolution testing

Implementation follows a systematic pattern of increasing complexity in property chaining scenarios.

Technical Details

Testing infrastructure includes:

JUnit 4 testing framework
HystrixProperty.Factory utility methods
Assert.assertEquals for value validation
Suppressed warnings for unchecked type casting

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Incremental complexity in test cases
Clear test method naming
Comprehensive edge case coverage
Proper test isolation
Consistent assertion patterns

netflix/hystrix

hystrix-core/src/test/java/com/netflix/hystrix/strategy/properties/HystrixPropertyTest.java

            
/**
 * Copyright 2015 Netflix, Inc.
 *
 * Licensed 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 com.netflix.hystrix.strategy.properties;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

import com.netflix.hystrix.strategy.properties.HystrixProperty.Factory;

public class HystrixPropertyTest {

    @Test
    public void testNested1() {
        HystrixProperty<String> a = Factory.asProperty("a");
        assertEquals("a", a.get());

        HystrixProperty<String> aWithDefault = Factory.asProperty(a, "b");
        assertEquals("a", aWithDefault.get());
    }

    @Test
    public void testNested2() {
        HystrixProperty<String> nullValue = Factory.nullProperty();

        HystrixProperty<String> withDefault = Factory.asProperty(nullValue, "b");
        assertEquals("b", withDefault.get());
    }

    @Test
    public void testNested3() {
        HystrixProperty<String> nullValue = Factory.nullProperty();
        HystrixProperty<String> a = Factory.asProperty(nullValue, "a");

        HystrixProperty<String> withDefault = Factory.asProperty(a, "b");
        assertEquals("a", withDefault.get());
    }

    @Test
    public void testNested4() {
        HystrixProperty<String> nullValue = Factory.nullProperty();
        HystrixProperty<String> a = Factory.asProperty(nullValue, null);

        HystrixProperty<String> withDefault = Factory.asProperty(a, "b");
        assertEquals("b", withDefault.get());
    }

    @Test
    public void testNested5() {
        HystrixProperty<String> nullValue = Factory.nullProperty();
        HystrixProperty<String> a = Factory.asProperty(nullValue, null);

        @SuppressWarnings("unchecked")
        HystrixProperty<String> withDefault = Factory.asProperty(a, Factory.asProperty("b"));
        assertEquals("b", withDefault.get());
    }

    @Test
    public void testSeries1() {
        HystrixProperty<String> nullValue = Factory.nullProperty();
        HystrixProperty<String> a = Factory.asProperty(nullValue, null);

        @SuppressWarnings("unchecked")
        HystrixProperty<String> withDefault = Factory.asProperty(a, nullValue, nullValue, Factory.asProperty("b"));
        assertEquals("b", withDefault.get());
    }

    @Test
    public void testSeries2() {
        HystrixProperty<String> nullValue = Factory.nullProperty();
        HystrixProperty<String> a = Factory.asProperty(nullValue, null);

        @SuppressWarnings("unchecked")
        HystrixProperty<String> withDefault = Factory.asProperty(a, nullValue, Factory.asProperty("b"), nullValue, Factory.asProperty("c"));
        assertEquals("b", withDefault.get());
    }

}