eclipse {
  project {
    file {
      beforeMerged {
        assert it.natures.contains('some.nature.one')
        it.natures << 'some.nature.two'
      }
      whenMerged {
        assert it.natures.contains('some.nature.one')
        assert it.natures.contains('some.nature.two')

        it.natures << 'some.nature.three'
      }
    }
  }
}
        """
        when:

<projectDescription>
	<name>javabaseproject</name>
	<comment/>
	<projects/>
	<natures>
		<nature>org.eclipse.jdt.core.javanature</nature>
	</natures>
	<buildSpec>
		<buildCommand>
			<name>org.eclipse.jdt.core.javabuilder</name>
			<arguments/>
		</buildCommand>
	</buildSpec>
	<linkedResources/>
	<filteredResources/>

                    <key>climate</key>
                    <value>cold</value>
                </dictionary>
            </arguments>
        </buildCommand>
    </buildSpec>
    <natures>
        <nature>org.eclipse.jdt.core.scalanature</nature>
    </natures>
    <linkedResources>
        <link>
            <name>somename</name>
            <type>sometype</type>
            <location>somelocation</location>
        </link>

        return null;
    }

    public Nature getNature() {
        if (metadata instanceof RepositoryMetadata) {
            switch (((RepositoryMetadata) metadata).getNature()) {
                case RepositoryMetadata.RELEASE_OR_SNAPSHOT:
                    return Nature.RELEASE_OR_SNAPSHOT;
                case RepositoryMetadata.SNAPSHOT:
                    return Nature.SNAPSHOT;
                default:

    <buildCommand><name>org.eclipse.pde.SchemaBuilder</name><arguments/></buildCommand>
  </buildSpec>
  <natures>
    <nature>org.eclipse.pde.PluginNature</nature>
    <nature>org.eclipse.jdt.core.javanature</nature>
  </natures>
</projectDescription>
"""
    }

    private String getDotClasspathText(String jarName) {
        """<?xml version="1.0" encoding="UTF-8"?>

        buildFile <<
        """apply plugin: 'java'
           apply plugin: 'eclipse'
           import org.gradle.plugins.ide.eclipse.model.BuildCommand

           eclipse.project {
               natures += ['nature.a']
               buildCommand 'command1', argumentKey: 'arg'
           }
        """

        when:
        EclipseProject project = loadToolingModel(EclipseProject)

        then:

        return artifact.getArtifactId();
    }

    @Override
    public String getVersion() {
        return "";
    }

    @Override
    public Nature getNature() {
        return artifact.isSnapshot() ? Nature.RELEASE_OR_SNAPSHOT : Nature.RELEASE;
    }

        return artifact.getArtifactId();
    }

    @Override
    public String getVersion() {
        return "";
    }

    @Override
    public Nature getNature() {
        return artifact.isSnapshot() ? Nature.RELEASE_OR_SNAPSHOT : Nature.RELEASE;
    }

        return metadata.getArtifactId();
    }

    @Override
    public String getVersion() {
        return metadata.getVersion();
    }

    @Override
    public Nature getNature() {
        return Nature.SNAPSHOT;
    }

            "org.eclipse.wst.common.project.facet.core.nature",
            "org.eclipse.wst.common.modulecore.ModuleCoreNature",
            "org.eclipse.jem.workbench.JavaEMFNature")
    }

    void assertHasNatures(String... natures) {
        assert this.project.natures.nature*.text() == natures as List
    }

    void assertHasJavaFacetBuilders() {