create-mock-context.js

const createMockActionContext = require('fluxible/utils').createMockActionContext;

module.exports = function (opts, contextMethods) {
   const mockContext = createMockActionContext(opts);
   const dispatcher = mockContext.dispatcherContext.dispatcher;
   
   mockContext.dispatcherContext = dispatcher.createContext(contextMethods);

   return mockContext;
}

test.spec.js

const createMockActionContext = require('./create-mock-context.js');

createMockActionContext({
  stores: []
}, {
  pluginMethod() {
    // implement mock for plugin method
  }
})