Based on PyGL headless test and @ototoi 's code

egl.py

import OpenGL
import OpenGL.platform.egl
OpenGL.platform.PLATFORM = p = OpenGL.platform.egl.EGLPlatform()
from OpenGL import *
from OpenGL.GL import *
from OpenGL.EGL import *
from functools import wraps
import ctypes


DESIRED_ATTRIBUTES = [
    EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
    EGL_BLUE_SIZE, 8,
    EGL_RED_SIZE,8,
    EGL_GREEN_SIZE,8,
    EGL_DEPTH_SIZE,24,
    EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER,
    EGL_CONFIG_CAVEAT, EGL_NONE, # Don't allow slow/non-conformant
]

API_BITS = {
    'opengl': EGL_OPENGL_BIT,
    'gl': EGL_OPENGL_BIT,
    'gles2': EGL_OPENGL_ES2_BIT,
    'gles1': EGL_OPENGL_ES_BIT,
    'gles': EGL_OPENGL_ES_BIT,
    'es2': EGL_OPENGL_ES2_BIT,
    'es1': EGL_OPENGL_ES_BIT,
    'es': EGL_OPENGL_ES_BIT,
}
API_NAMES = dict([
    (k,{
        EGL_OPENGL_BIT:EGL_OPENGL_API,
        EGL_OPENGL_ES2_BIT:EGL_OPENGL_ES_API,
        EGL_OPENGL_ES_BIT:EGL_OPENGL_ES_API
    }[v])
    for k,v in API_BITS.items()
])

def egltest( size=(1024,1024), name=None, api='es2', attributes=DESIRED_ATTRIBUTES ):
    def gltest( function ):
        """Decorator to allow a function to run in a Pygame GLES[1,2,3] context"""
        @wraps( function )
        def test_function( *args, **named ):
            major,minor = ctypes.c_long(),ctypes.c_long()
            display = eglGetDisplay(EGL_DEFAULT_DISPLAY)
            eglInitialize( display, major, minor)
            num_configs = ctypes.c_long()
            configs = (EGLConfig*2)()
            api_constant = API_NAMES[api.lower()]
            local_attributes = attributes[:]
            local_attributes.extend( [
                EGL_CONFORMANT, API_BITS[api.lower()],
                EGL_NONE,
            ])
            print('local_attributes', local_attributes)
            local_attributes= arrays.GLintArray.asArray( local_attributes )
            eglChooseConfig(display, local_attributes, configs, 2, num_configs)

            pbufferAttribs = [
                EGL_WIDTH, size[0],
                EGL_HEIGHT, size[1],
                EGL_NONE
            ]
            arr = (EGLint * len(pbufferAttribs))(*pbufferAttribs)
            #pbuffer_attribs = np.array([
            #        EGL_WIDTH, size[0],
            #        EGL_HEIGHT, size[1],
            #        EGL_NONE
            #], dtype="i4")
            surface = eglCreatePbufferSurface(display, configs[0], arr) #pbuffer_attribs)
            if surface == EGL_NO_SURFACE:
                raise RuntimeError("failed to eglCreatePbufferSurface")

            #eglStatus = eglBindAPI(EGL_OPENGL_API);
            #if eglStatus == EGL_FALSE:
            #    raise RuntimeError("failed to eglBindAPI")
            print('API', api_constant)
            eglBindAPI(api_constant)

            ctx = eglCreateContext(display, configs[0], EGL_NO_CONTEXT, None)
            if ctx == EGL_NO_CONTEXT:
                raise RuntimeError( 'Unable to create context' )
            eglMakeCurrent( display, surface, surface, ctx )
            function(*args, **named)
            eglSwapBuffers( display, surface )
        return test_function
    return gltest


# @egltest( api='opengl' )

@egltest()
def test_gl():
    glClearColor( 1,0,0, 0 )
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
    print('hello')

test_gl()

Output:

local_attributes [EGL_SURFACE_TYPE, EGL_PBUFFER_BIT, EGL_BLUE_SIZE, 8, EGL_RED_SIZE, 8, EGL_GREEN_SIZE, 8, EGL_DEPTH_SIZE, 24, EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER, EGL_CONFIG_CAVEAT, EGL_NONE, EGL_CONFORMANT, EGL_OPENGL_ES2_BIT, EGL_NONE]
API EGL_OPENGL_ES_API (12448)
hello

It runs on nvidia/cudagl