Add error for suites without callback functions

Author: lilaconlee

packages/driver/src/cy/errors.coffee

@@ -2,6 +2,7 @@ $dom = require("../dom")
 $utils = require("../cypress/utils")
 
 crossOriginScriptRe = /^script error/i
+describeCallbackRe = /context\.describe\.context\.context/i
 
 create = (state, config, log) ->
   commandErr = (err) ->
@@ -49,7 +50,10 @@ create = (state, config, log) ->
       when "app" then "uncaught.fromApp"
       when "spec" then "uncaught.fromSpec"
 
-    err = $utils.appendErrMsg(err, $utils.errMessageByPath(suffixMsg))
+    if describeCallbackRe.test(err.stack)
+      err = $utils.appendErrMsg(err, $utils.errMessageByPath("uncaught.no_suite_callback"))
+    else
+      err = $utils.appendErrMsg(err, $utils.errMessageByPath(suffixMsg))
 
     err.onFail = ->
       if l = current and current.getLastLog()

packages/driver/src/cypress/error_messages.coffee

@@ -793,6 +793,11 @@ module.exports = {
     wrong_type: "#{cmd('type')} can only accept a String or Number. You passed in: '{{chars}}'"
 
   uncaught:
+    no_suite_callback: """
+    Cypress detected a suite, such as a 'describe' or 'context' block, without a callback function.
+
+    Provide a callback function or intentionally skip the suite or this test to run.
+    """
     cross_origin_script: """
       Script error.