WinkSystemPropertiesTest.java

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package org.apache.wink.common.internal.properties;

import java.util.Properties;

import junit.framework.TestCase;

import org.junit.Test;

public class WinkSystemPropertiesTest extends TestCase {

    private static final String PROP_KEY = "someSysPropKey";
    
    @Override
    public void setUp() {
        System.clearProperty(PROP_KEY);
    }
    
    @Test
    public void testNullToleration() {
        System.setProperty(PROP_KEY, "false");
        // loadSystemProperties can only override an existing key in the properties bag.  We should get an empty bag back
        Properties props = WinkSystemProperties.loadSystemProperties(null);
        assertTrue("expected empty properties bag", props.isEmpty());
    }

    
    @Test
    public void testEmptyValue() {
        Properties startProps = new Properties();
        startProps.put(PROP_KEY, "");
        System.setProperty(PROP_KEY, "false");
        // loadSystemProperties can override an existing key in the properties bag when the value is empty
        Properties props = WinkSystemProperties.loadSystemProperties(startProps);
        assertEquals("expected non-null \""+PROP_KEY+"\" property to be \"false\"", "false", props.getProperty(PROP_KEY));
    }
    
    @Test
    public void testGetSystemProperties() throws Exception {
        Properties startProps = new Properties();  // empty
        System.setProperty(PROP_KEY, "false");
        // loadSystemProperties can only override an existing key in the properties bag.  We should get an empty bag back
        Properties props = WinkSystemProperties.loadSystemProperties(startProps);
        assertTrue("expected empty properties bag", props.isEmpty());
    }
    
    @Test
    public void testPropsOverride() throws Exception {
        Properties startProps = new Properties();
        startProps.setProperty(PROP_KEY, "true");
        System.setProperty(PROP_KEY, "false");
        // make sure the system property does NOT override what's already in the bag.  We should get an empty bag back
        Properties props = WinkSystemProperties.loadSystemProperties(startProps);
        assertTrue("expected empty properties bag", props.isEmpty());
    }

}