fix: give proper error message when err.stack is undefined

packages/driver/src/cypress/cy.coffee

@@ -484,6 +484,8 @@ create = (specWindow, Cypress, Cookies, state, config, log) ->
       ## since this failed this means that a
       ## specific command failed and we should
       ## highlight it in red or insert a new command
+
+      err.name = err.name || 'CypressError'
       errors.commandRunningFailed(err)
 
       fail(err, state("runnable"))

packages/driver/src/cypress/utils.coffee

@@ -84,7 +84,7 @@ module.exports = {
     ## because the browser has a cached
     ## dynamic stack getter that will
     ## not be evaluated later
-    stack = err.stack
+    stack = err.stack or ''
 
     ## preserve message
     ## and toString

packages/server/__snapshots__/3_issue_1669_spec.coffee.js

@@ -0,0 +1,89 @@
+exports['e2e issue 2891 passes 1'] = `
+
+====================================================================================================
+
+  (Run Starting)
+
+  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
+  │ Cypress:    1.2.3                                                                              │
+  │ Browser:    FooBrowser 88                                                                      │
+  │ Specs:      1 found (issue_1669_spec.js)                                                       │
+  │ Searched:   cypress/integration/issue_1669_spec.js                                             │
+  └────────────────────────────────────────────────────────────────────────────────────────────────┘
+
+
+────────────────────────────────────────────────────────────────────────────────────────────────────
+
+  Running:  issue_1669_spec.js                                                              (1 of 1)
+
+
+  issue-1669 undefined err.stack in beforeEach hook
+    1) "before each" hook for "cy.setCookie should fail with correct error"
+
+
+  0 passing
+  1 failing
+
+  1) issue-1669 undefined err.stack in beforeEach hook "before each" hook for "cy.setCookie should fail with correct error":
+     CypressError: cy.setCookie() must be passed an RFC-6265-compliant cookie value. You passed:
+
+\`   bar\`
+
+Because this error occurred during a 'before each' hook we are skipping the remaining tests in the current suite: 'issue-1669 undefined err.st...'
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+      at stack trace line
+
+
+
+
+  (Results)
+
+  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
+  │ Tests:        1                                                                                │
+  │ Passing:      0                                                                                │
+  │ Failing:      1                                                                                │
+  │ Pending:      0                                                                                │
+  │ Skipped:      0                                                                                │
+  │ Screenshots:  1                                                                                │
+  │ Video:        true                                                                             │
+  │ Duration:     X seconds                                                                        │
+  │ Spec Ran:     issue_1669_spec.js                                                               │
+  └────────────────────────────────────────────────────────────────────────────────────────────────┘
+
+
+  (Screenshots)
+
+  -  /XXX/XXX/XXX/cypress/screenshots/issue_1669_spec.js/issue-1669 undefined err.sta     (1280x720)
+     ck in beforeEach hook -- cy.setCookie should fail with correct error -- before e               
+     ach hook (failed).png                                                                          
+
+
+  (Video)
+
+  -  Started processing:  Compressing to 32 CRF                                                     
+  -  Finished processing: /XXX/XXX/XXX/cypress/videos/issue_1669_spec.js.mp4              (X second)
+
+
+====================================================================================================
+
+  (Run Finished)
+
+
+       Spec                                              Tests  Passing  Failing  Pending  Skipped  
+  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
+  │ ✖  issue_1669_spec.js                       XX:XX        1        -        1        -        - │
+  └────────────────────────────────────────────────────────────────────────────────────────────────┘
+    ✖  1 of 1 failed (100%)                     XX:XX        1        -        1        -        -  
+
+
+`

packages/server/test/e2e/3_issue_1669_spec.coffee

@@ -0,0 +1,15 @@
+e2e = require("../support/helpers/e2e")
+Fixtures = require("../support/helpers/fixtures")
+
+describe "e2e issue 2891", ->
+  e2e.setup()
+
+  ## https://github.com/cypress-io/cypress/issues/2891
+
+  it "passes", ->
+    e2e.exec(@, {
+      spec: "issue_1669_spec.js"
+      snapshot: true
+      browser: 'chrome'
+      expectedExitCode: 1
+    })

packages/server/test/support/fixtures/projects/e2e/cypress/integration/issue_1669_spec.js

@@ -0,0 +1,9 @@
+describe('issue-1669 undefined err.stack in beforeEach hook', () => {
+  beforeEach(() => {
+    cy.setCookie('foo', '   bar')
+  })
+
+  it('cy.setCookie should fail with correct error', () => {
+    expect(true).ok
+  })
+})