Ant build.xml working Eclipse. Not working direct - eclipse

Question

My buildfile seems to be running correctly (and generating junit test reports) correctly when executing in Eclipse, however when I execute directly with: ant -buildfile C:\....\build.xml the files aren't produced - and the cmd output suggests it's not running the tests.
I have two eclipse projects. JUnitTest1 which is the code. JUnitTestUnitTests which contains the test code.
I've followed the instructions here to create my buildfile in eclipse (selecting only the test project) and can see the files drop into the junit directory.
When I run ant command directly, no files are generated and it doesn't look like it's running my tests.
Why aren't the changes made via the eclipse GUI reflected in the build.xml? I thought it was auto updated?
Here's the eclipse config
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- WARNING: Eclipse auto-generated file.
Any modifications will be overwritten.
To include a user specific buildfile here, simply create one in the same
directory with the processing instruction <?eclipse.ant.import?>
as the first entry and export the buildfile again. --><project basedir="." default="build" name="JUnitTest1UnitTests">
<property environment="env"/>
<property name="ECLIPSE_HOME" value="../../../../../tools/eclipse-mars/"/>
<property name="junit.output.dir" value="junit"/>
<property name="JUnitTest1.location" value="../JUnitTest1"/>
<property name="debuglevel" value="source,lines,vars"/>
<property name="target" value="1.7"/>
<property name="source" value="1.7"/>
<path id="JUnitTest1.classpath">
<pathelement location="${JUnitTest1.location}/bin"/>
<pathelement location="${JUnitTest1.location}/../../../../../tools/libs/hamcrest-core-1.3.jar"/>
<pathelement location="${JUnitTest1.location}/../../../../../tools/libs/junit-4.12.jar"/>
</path>
<path id="JUnitTest1UnitTests.classpath">
<pathelement location="bin"/>
<pathelement location="../../../../../tools/libs/hamcrest-core-1.3.jar"/>
<pathelement location="../../../../../tools/libs/junit-4.12.jar"/>
<path refid="JUnitTest1.classpath"/>
</path>
<target name="init">
<mkdir dir="bin"/>
<copy includeemptydirs="false" todir="bin">
<fileset dir="src">
<exclude name="**/*.launch"/>
<exclude name="**/*.java"/>
</fileset>
</copy>
</target>
<target name="clean">
<delete dir="bin"/>
</target>
<target depends="clean" name="cleanall">
<ant antfile="build.xml" dir="${JUnitTest1.location}" inheritAll="false" target="clean"/>
</target>
<target depends="build-subprojects,build-project" name="build"/>
<target name="build-subprojects">
<ant antfile="build.xml" dir="${JUnitTest1.location}" inheritAll="false" target="build-project">
<propertyset>
<propertyref name="build.compiler"/>
</propertyset>
</ant>
</target>
<target depends="init" name="build-project">
<echo message="${ant.project.name}: ${ant.file}"/>
<javac debug="true" debuglevel="${debuglevel}" destdir="bin" includeantruntime="false" source="${source}" target="${target}">
<src path="src"/>
<classpath refid="JUnitTest1UnitTests.classpath"/>
</javac>
</target>
<target description="Build all projects which reference this project. Useful to propagate changes." name="build-refprojects"/>
<target description="copy Eclipse compiler jars to ant lib directory" name="init-eclipse-compiler">
<copy todir="${ant.library.dir}">
<fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/>
</copy>
<unzip dest="${ant.library.dir}">
<patternset includes="jdtCompilerAdapter.jar"/>
<fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/>
</unzip>
</target>
<target description="compile project with Eclipse compiler" name="build-eclipse-compiler">
<property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/>
<antcall target="build"/>
</target>
<target name="JUnitTest1UnitTests">
<mkdir dir="${junit.output.dir}"/>
<junit fork="yes" printsummary="withOutAndErr">
<formatter type="xml"/>
<test name="com.me.tests.MyTestClass" todir="${junit.output.dir}"/>
<classpath refid="JUnitTest1UnitTests.classpath"/>
</junit>
</target>
<target name="junitreport">
<junitreport todir="${junit.output.dir}">
<fileset dir="${junit.output.dir}">
<include name="TEST-*.xml"/>
</fileset>
<report format="frames" todir="${junit.output.dir}"/>
</junitreport>
</target>

Answer 1

I believe I've fixed this.
Eclipse creates your build file and seperately, you configure your run configurations. These run configurations (where you specify the run order of the ant tasks) are not persisted or represented in the actual build file.
The default target of the build file is the target="build" ... So you need to manually edit the build file and use the depends="..." clause to chain together the dependancies of your tasks.
This page (read example build file and see final line) has a great explanation of the depends clause.