protected void validateEnv(Map<String, String> env) {
        Assertions.assertEquals(2, env.size());
        Assertions.assertEquals("name", env.get("NAME"));
        Assertions.assertEquals("true", env.get("BOOL"));
    }
Parses the supplied binding string for the host portion, and insures the host portion actually exists on the
filesystem.  Note this method is designed to accommodate both Windows-style and *nix-style absolute paths.
<p>
The {@code docker-compose.yml} used for testing contains volume binding strings which are <em>relative</em>.
When the {@link RunVolumeConfiguration} is built, relative paths in the host portion of the binding string are
resolved to absolute paths.  This method expects a binding string that has already had its relative paths
<em>resolved</em> to absolute paths.  It parses the host portion of the binding string, and asserts that the path
exists on the system.
</p>

@param bindString a volume binding string that contains a host portion that is expected to exist on the local
system
src/test/java/io/fabric8/maven/docker/config/handler/compose/DockerComposeConfigHandlerTest.java