A jasmin-maven project showing that preloadSource does not work as expected

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>jasmine-project</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>A Jasmine Project</name>
    <url>http://github.com/searls/jasmine-maven-plugin</url>
    <build>
        <plugins>
            <plugin>
                <groupId>com.github.searls</groupId>
                <artifactId>jasmine-maven-plugin</artifactId>
                <version>1.3.1.5</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>test</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <preloadSources>
                        <source>vendor/yui-min.js</source>
                        <source>vendor/yui-core-min.js</source>
                        <source>vendor/yui-base-min.js</source>
                        <source>vendor/es5-shim.min.js</source>
                    </preloadSources>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>