diff --git a/lib/buffered-runner.js b/lib/buffered-runner.js
index 539d3e3366..a99ec03ed4 100644
--- a/lib/buffered-runner.js
+++ b/lib/buffered-runner.js
@@ -83,7 +83,6 @@ class BufferedRunner extends Runner {
    * run.  The information is processed as it's received, and emitted to a
    * {@link Reporter}, which is likely listening for these events.
    *
-   * @todo handle delayed runs?
    * @param {Function} callback - Called with an exit code corresponding to
    * number of test failures.
    * @param {{files: string[], options: Options}} opts - Files to run and
diff --git a/package-lock.json b/package-lock.json
index 4e1edfcdf7..677442fb0e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -851,12 +851,27 @@
         "color-convert": "^1.9.0"
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+      "integrity": "sha1-/XU++kvq2g6smZgbxSo/b/AZ3rc=",
+      "dev": true,
+      "requires": {
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+      }
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       "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768=",
       "dev": true
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+    "ansicolors": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/ansicolors/-/ansicolors-0.2.1.tgz",
+      "integrity": "sha1-vgiVmQl7dKXJxKhKDNvNtivYeu8=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/any-observable/-/any-observable-0.3.0.tgz",
@@ -1857,6 +1872,82 @@
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+      "resolved": "https://registry.npmjs.org/blessed/-/blessed-0.1.81.tgz",
+      "integrity": "sha1-+WLWh+wsNpVwrnGvhDJW5tDKESk=",
+      "dev": true
+    },
+    "blessed-contrib": {
+      "version": "2.5.3",
+      "resolved": "https://registry.npmjs.org/blessed-contrib/-/blessed-contrib-2.5.3.tgz",
+      "integrity": "sha1-0npskX7Q4LJ3tDqY6MYixjtXc/4=",
+      "dev": true,
+      "requires": {
+        "ansi-term": ">=0.0.1",
+        "chalk": "^1.1.0",
+        "drawille-canvas-blessed-contrib": ">=0.0.1",
+        "lodash": ">=3.0.0",
+        "map-canvas": ">=0.1.5",
+        "marked": "^0.3.3",
+        "marked-terminal": "^1.5.0",
+        "memory-streams": "^0.1.0",
+        "memorystream": "^0.3.1",
+        "picture-tube": "0.0.4",
+        "request": "^2.53.0",
+        "sparkline": "^0.1.1",
+        "strip-ansi": "^3.0.0",
+        "term-canvas": "0.0.5"
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+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "ansi-styles": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "marked": {
+          "version": "0.3.19",
+          "resolved": "https://registry.npmjs.org/marked/-/marked-0.3.19.tgz",
+          "integrity": "sha512-ea2eGWOqNxPcXv8dyERdSr/6FmzvWwzjMxpfGB/sbMccXoct+xY+YukPD+QTUZwyvK7BZwcr4m21WBOW41pAkg==",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
+      }
+    },
     "blob": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/blob/-/blob-0.0.5.tgz",
@@ -1999,6 +2090,12 @@
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+    "bresenham": {
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+      "resolved": "https://registry.npmjs.org/bresenham/-/bresenham-0.0.3.tgz",
+      "integrity": "sha1-q9q55bGU4nx1fNMU2ERDFPKZh3o=",
+      "dev": true
+    },
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@@ -3266,6 +3363,12 @@
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+      "resolved": "https://registry.npmjs.org/buffers/-/buffers-0.1.1.tgz",
+      "integrity": "sha1-skV5w77U1tOWru5tmorn9Ugqt7s=",
+      "dev": true
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       "dev": true
     },
+    "cardinal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/cardinal/-/cardinal-1.0.0.tgz",
+      "integrity": "sha1-UOIcGwqjdyn5N33vGWtanOyTLuk=",
+      "dev": true,
+      "requires": {
+        "ansicolors": "~0.2.1",
+        "redeyed": "~1.0.0"
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@@ -3605,6 +3718,12 @@
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       "dev": true
     },
+    "charm": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/charm/-/charm-0.1.2.tgz",
+      "integrity": "sha1-BsIe7RobBq62dVPNxT4jJ0usIpY=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
@@ -3709,6 +3828,23 @@
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       }
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+    "cli-table": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/cli-table/-/cli-table-0.3.1.tgz",
+      "integrity": "sha1-9TsFJmqLGguTSz0IIebi3FkUriM=",
+      "dev": true,
+      "requires": {
+        "colors": "1.0.3"
+      },
+      "dependencies": {
+        "colors": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
+          "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=",
+          "dev": true
+        }
+      }
+    },
     "cli-truncate": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/cli-truncate/-/cli-truncate-0.2.1.tgz",
@@ -3768,6 +3904,35 @@
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+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/climem/-/climem-1.0.3.tgz",
+      "integrity": "sha1-WwkuJ6URouSFlQkWGN9FUQ69T7E=",
+      "dev": true,
+      "requires": {
+        "blessed": "^0.1.81",
+        "blessed-contrib": "^2.5.3",
+        "flush-write-stream": "^1.0.0",
+        "from2": "^2.1.1",
+        "inherits": "^2.0.1",
+        "minimist": "^1.2.0",
+        "pump": "^1.0.1",
+        "readable-stream": "^2.0.5",
+        "split2": "^2.0.0"
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+      "dependencies": {
+        "pump": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/pump/-/pump-1.0.3.tgz",
+          "integrity": "sha512-8k0JupWme55+9tCVE+FS5ULT3K6AbgqrGa58lTT49RpyfwwcGedHqaC5LlQNdEAumn/wFsu6aPwkuPMioy8kqw==",
+          "dev": true,
+          "requires": {
+            "end-of-stream": "^1.1.0",
+            "once": "^1.3.1"
+          }
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@@ -5278,6 +5443,25 @@
         }
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     },
+    "drawille-blessed-contrib": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/drawille-blessed-contrib/-/drawille-blessed-contrib-1.0.0.tgz",
+      "integrity": "sha1-FcJ5NPV6AFatE1luFWFje8lB8Lc=",
+      "dev": true
+    },
+    "drawille-canvas-blessed-contrib": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/drawille-canvas-blessed-contrib/-/drawille-canvas-blessed-contrib-0.1.3.tgz",
+      "integrity": "sha1-IS8HinIr/S7MJn6oarbd3BCB/Ug=",
+      "dev": true,
+      "requires": {
+        "ansi-term": ">=0.0.2",
+        "bresenham": "0.0.3",
+        "drawille-blessed-contrib": ">=0.0.1",
+        "gl-matrix": "^2.1.0",
+        "x256": ">=0.0.1"
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     "duplexer": {
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       "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.1.tgz",
@@ -6868,6 +7052,16 @@
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       "dev": true
     },
+    "flush-write-stream": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/flush-write-stream/-/flush-write-stream-1.1.1.tgz",
+      "integrity": "sha512-3Z4XhFZ3992uIq0XOqb9AreonueSYphE6oYbpt5+3u06JWklbsPkNv3ZKkP9Bz/r+1MWCaMoSQ28P85+1Yc77w==",
+      "dev": true,
+      "requires": {
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+        "readable-stream": "^2.3.6"
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@@ -7167,6 +7361,12 @@
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+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/gl-matrix/-/gl-matrix-2.8.1.tgz",
+      "integrity": "sha512-0YCjVpE3pS5XWlN3J4X7AiAx65+nqAI54LndtVFnQZB6G/FVLkZH8y8V6R3cIoOQR4pUdfwQGd1iwyoXHJ4Qfw==",
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@@ -7602,6 +7802,12 @@
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+    "here": {
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+      "resolved": "https://registry.npmjs.org/here/-/here-0.0.2.tgz",
+      "integrity": "sha1-acGvPwISHz2HiOAuhNyLOQXXEZU=",
+      "dev": true
+    },
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@@ -10207,6 +10413,12 @@
         "lodash._reinterpolate": "^3.0.0"
       }
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+    "lodash.toarray": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/lodash.toarray/-/lodash.toarray-4.4.0.tgz",
+      "integrity": "sha1-JMS/zWsvuji/0FlNsRedjptlZWE=",
+      "dev": true
+    },
     "lodash.uniq": {
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       "resolved": "https://registry.npmjs.org/lodash.uniq/-/lodash.uniq-4.5.0.tgz",
@@ -10442,6 +10654,16 @@
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       "dev": true
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+    "map-canvas": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/map-canvas/-/map-canvas-0.1.5.tgz",
+      "integrity": "sha1-i+a63gvz6fmotW6INqHR0TPKsYY=",
+      "dev": true,
+      "requires": {
+        "drawille-canvas-blessed-contrib": ">=0.0.1",
+        "xml2js": "^0.4.5"
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       "dev": true
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+    "marked-terminal": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/marked-terminal/-/marked-terminal-1.7.0.tgz",
+      "integrity": "sha1-yMRgiBx3LHYEtkNnAH7l938SWQQ=",
+      "dev": true,
+      "requires": {
+        "cardinal": "^1.0.0",
+        "chalk": "^1.1.3",
+        "cli-table": "^0.3.1",
+        "lodash.assign": "^4.2.0",
+        "node-emoji": "^1.4.1"
+      },
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+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "ansi-styles": {
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+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
+      }
+    },
     "math-random": {
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       "resolved": "https://registry.npmjs.org/math-random/-/math-random-1.0.4.tgz",
@@ -10909,6 +11186,47 @@
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+    "memory-streams": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/memory-streams/-/memory-streams-0.1.3.tgz",
+      "integrity": "sha512-qVQ/CjkMyMInPaaRMrwWNDvf6boRZXaT/DbQeMYcCWuXPEBf1v8qChOc9OlEVQp2uOvRXa1Qu30fLmKhY6NipA==",
+      "dev": true,
+      "requires": {
+        "readable-stream": "~1.0.2"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true
+        },
+        "readable-stream": {
+          "version": "1.0.34",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
+          "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
+          "dev": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.1",
+            "isarray": "0.0.1",
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+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true
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+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/memorystream/-/memorystream-0.3.1.tgz",
+      "integrity": "sha1-htcJCzDORV1j+64S3aUaR93K+bI=",
+      "dev": true
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@@ -11364,6 +11682,15 @@
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+    "node-emoji": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/node-emoji/-/node-emoji-1.10.0.tgz",
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+      "dev": true,
+      "requires": {
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@@ -12815,6 +13142,64 @@
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+    "picture-tube": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/picture-tube/-/picture-tube-0.0.4.tgz",
+      "integrity": "sha1-Id4Ctxecy3OvCD8RL1JnYy/G6MY=",
+      "dev": true,
+      "requires": {
+        "buffers": "~0.1.1",
+        "charm": "~0.1.0",
+        "event-stream": "~0.9.8",
+        "optimist": "~0.3.4",
+        "png-js": "~0.1.0",
+        "request": "~2.9.202",
+        "x256": "~0.0.1"
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+          "version": "0.9.8",
+          "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-0.9.8.tgz",
+          "integrity": "sha1-XanPPHkAl1mJ21powo5bPJjr4Do=",
+          "dev": true,
+          "requires": {
+            "optimist": "0.2"
+          },
+          "dependencies": {
+            "optimist": {
+              "version": "0.2.8",
+              "resolved": "https://registry.npmjs.org/optimist/-/optimist-0.2.8.tgz",
+              "integrity": "sha1-6YGrfiaLRXlIWTtVZ0wJmoFcrDE=",
+              "dev": true,
+              "requires": {
+                "wordwrap": ">=0.0.1 <0.1.0"
+              }
+            }
+          }
+        },
+        "optimist": {
+          "version": "0.3.7",
+          "resolved": "https://registry.npmjs.org/optimist/-/optimist-0.3.7.tgz",
+          "integrity": "sha1-yQlBrVnkJzMokjB00s8ufLxuwNk=",
+          "dev": true,
+          "requires": {
+            "wordwrap": "~0.0.2"
+          }
+        },
+        "request": {
+          "version": "2.9.203",
+          "resolved": "https://registry.npmjs.org/request/-/request-2.9.203.tgz",
+          "integrity": "sha1-bBcRpUB/uUoRQhlWPkQUW8v0cjo=",
+          "dev": true
+        },
+        "wordwrap": {
+          "version": "0.0.3",
+          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
+          "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
+          "dev": true
+        }
+      }
+    },
     "pify": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
@@ -12971,6 +13356,12 @@
       "integrity": "sha512-2qHaIQr2VLRFoxe2nASzsV6ef4yOOH+Fi9FBOVH6cqeSgUnoyySPZkxzLuzd+RYOQTRpROA0ztTMqxROKSb/nA==",
       "dev": true
     },
+    "png-js": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/png-js/-/png-js-0.1.1.tgz",
+      "integrity": "sha1-HMfCEjA6yr50Jj7DrHgAlYAkLZM=",
+      "dev": true
+    },
     "pngcrush": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/pngcrush/-/pngcrush-2.0.1.tgz",
@@ -14332,6 +14723,23 @@
         "strip-indent": "^1.0.1"
       }
     },
+    "redeyed": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/redeyed/-/redeyed-1.0.1.tgz",
+      "integrity": "sha1-6WwZO0DAgWsArshCaY5hGF5VSYo=",
+      "dev": true,
+      "requires": {
+        "esprima": "~3.0.0"
+      },
+      "dependencies": {
+        "esprima": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.0.0.tgz",
+          "integrity": "sha1-U88kes2ncxPlUcOqLnM0LT+099k=",
+          "dev": true
+        }
+      }
+    },
     "regenerator-runtime": {
       "version": "0.11.1",
       "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz",
@@ -15838,6 +16246,27 @@
       "integrity": "sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=",
       "dev": true
     },
+    "sparkline": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/sparkline/-/sparkline-0.1.2.tgz",
+      "integrity": "sha1-w73kYlKxNU5xDEsgDVSBa9nwejI=",
+      "dev": true,
+      "requires": {
+        "here": "0.0.2",
+        "nopt": "~2.1.2"
+      },
+      "dependencies": {
+        "nopt": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/nopt/-/nopt-2.1.2.tgz",
+          "integrity": "sha1-bMzZd7gBMqB3MdbozljCyDA8+a8=",
+          "dev": true,
+          "requires": {
+            "abbrev": "1"
+          }
+        }
+      }
+    },
     "spawn-command": {
       "version": "0.0.2-1",
       "resolved": "https://registry.npmjs.org/spawn-command/-/spawn-command-0.0.2-1.tgz",
@@ -15941,6 +16370,27 @@
         "extend-shallow": "^3.0.0"
       }
     },
+    "split2": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/split2/-/split2-2.2.0.tgz",
+      "integrity": "sha512-RAb22TG39LhI31MbreBgIuKiIKhVsawfTgEGqKHTK87aG+ul/PB8Sqoi3I7kVdRWiCfrKxK3uo4/YUkpNvhPbw==",
+      "dev": true,
+      "requires": {
+        "through2": "^2.0.2"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "dev": true,
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
+      }
+    },
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -16707,6 +17157,12 @@
         "uuid": "^3.0.1"
       }
     },
+    "term-canvas": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/term-canvas/-/term-canvas-0.0.5.tgz",
+      "integrity": "sha1-WXr6wvpjaabxeGC86cX2bW6gypY=",
+      "dev": true
+    },
     "term-size": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/term-size/-/term-size-1.2.0.tgz",
@@ -18723,6 +19179,12 @@
         "async-limiter": "~1.0.0"
       }
     },
+    "x256": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/x256/-/x256-0.0.2.tgz",
+      "integrity": "sha1-ya8Yh296F1gB1WT+cK2egxd4STQ=",
+      "dev": true
+    },
     "xdg-basedir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
@@ -18735,6 +19197,22 @@
       "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
       "dev": true
     },
+    "xml2js": {
+      "version": "0.4.23",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.23.tgz",
+      "integrity": "sha512-ySPiMjM0+pLDftHgXY4By0uswI3SPKLDw/i3UXbnO8M/p28zqexCUoPmQFrYD+/1BzhGJSs2i1ERWKJAtiLrug==",
+      "dev": true,
+      "requires": {
+        "sax": ">=0.6.0",
+        "xmlbuilder": "~11.0.0"
+      }
+    },
+    "xmlbuilder": {
+      "version": "11.0.1",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-11.0.1.tgz",
+      "integrity": "sha512-fDlsI/kFEx7gLvbecc0/ohLG50fugQp8ryHzMTuW9vSa1GJ0XYWKnhsUx7oie3G98+r56aTQIUB4kht42R3JvA==",
+      "dev": true
+    },
     "xmlchars": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
diff --git a/package.json b/package.json
index cf89c89bfe..0392402648 100644
--- a/package.json
+++ b/package.json
@@ -86,6 +86,7 @@
     "browserify": "^16.5.0",
     "browserify-package-json": "^1.0.1",
     "chai": "^4.2.0",
+    "climem": "^1.0.3",
     "coffee-script": "^1.12.7",
     "coveralls": "^3.0.11",
     "cross-env": "^6.0.3",
diff --git a/test/node-unit/worker.spec.js b/test/node-unit/worker.spec.js
index 7de8b0cb1d..f84013e1f0 100644
--- a/test/node-unit/worker.spec.js
+++ b/test/node-unit/worker.spec.js
@@ -9,12 +9,17 @@ const WORKER_PATH = require.resolve('../../lib/worker.js');
 
 describe('worker', function() {
   let worker;
-  let workerpoolWorker;
   let sandbox;
+  let stubs;
 
   beforeEach(function() {
     sandbox = createSandbox();
-    workerpoolWorker = sandbox.stub();
+    stubs = {
+      workerpool: {
+        isMainThread: false,
+        worker: sandbox.stub()
+      }
+    };
     sandbox.spy(process, 'removeAllListeners');
   });
 
@@ -24,7 +29,7 @@ describe('worker', function() {
         rewiremock.proxy(WORKER_PATH, {
           workerpool: {
             isMainThread: true,
-            worker: workerpoolWorker
+            worker: stubs.workerpool.worker
           }
         });
       }, 'to throw');
@@ -32,41 +37,40 @@ describe('worker', function() {
   });
 
   describe('when run as worker process', function() {
-    class MockMocha {}
-    let serializer;
-    let runHelpers;
+    let mocha;
 
     beforeEach(function() {
-      MockMocha.prototype.addFile = sandbox.stub().returnsThis();
-      MockMocha.prototype.loadFilesAsync = sandbox.stub();
-      MockMocha.prototype.run = sandbox.stub();
-      MockMocha.interfaces = {
-        bdd: sandbox.stub()
+      mocha = {
+        addFile: sandbox.stub().returnsThis(),
+        loadFilesAsync: sandbox.stub().resolves(),
+        run: sandbox.stub().callsArgAsync(0),
+        unloadFiles: sandbox.stub().returnsThis()
       };
+      stubs.Mocha = Object.assign(sandbox.stub().returns(mocha), {
+        bdd: sandbox.stub(),
+        interfaces: {}
+      });
 
-      serializer = {
+      stubs.serializer = {
         serialize: sandbox.stub()
       };
 
-      runHelpers = {
+      stubs.runHelpers = {
         handleRequires: sandbox.stub(),
         validatePlugin: sandbox.stub(),
         loadRootHooks: sandbox.stub().resolves()
       };
 
       worker = rewiremock.proxy(WORKER_PATH, {
-        workerpool: {
-          isMainThread: false,
-          worker: workerpoolWorker
-        },
-        '../../lib/mocha': MockMocha,
-        '../../lib/serializer': serializer,
-        '../../lib/cli/run-helpers': runHelpers
+        workerpool: stubs.workerpool,
+        '../../lib/mocha': stubs.Mocha,
+        '../../lib/serializer': stubs.serializer,
+        '../../lib/cli/run-helpers': stubs.runHelpers
       });
     });
 
     it('should register itself with workerpool', function() {
-      expect(workerpoolWorker, 'to have a call satisfying', [
+      expect(stubs.workerpool.worker, 'to have a call satisfying', [
         {run: worker.run}
       ]);
     });
@@ -95,7 +99,7 @@ describe('worker', function() {
 
         describe('when the file at "filepath" argument is unloadable', function() {
           it('should reject', async function() {
-            MockMocha.prototype.loadFilesAsync.rejects();
+            mocha.loadFilesAsync.rejects();
             return expect(
               () => worker.run('some-non-existent-file.js'),
               'to be rejected'
@@ -108,8 +112,8 @@ describe('worker', function() {
           beforeEach(function() {
             result = SerializableWorkerResult.create();
 
-            MockMocha.prototype.loadFilesAsync.resolves();
-            MockMocha.prototype.run.yields(result);
+            mocha.loadFilesAsync.resolves();
+            mocha.run.yields(result);
           });
 
           it('should handle "--require"', async function() {
@@ -117,25 +121,27 @@ describe('worker', function() {
               'some-file.js',
               serializeJavascript({require: 'foo'})
             );
-            expect(runHelpers.handleRequires, 'to have a call satisfying', [
-              'foo'
-            ]).and('was called once');
+            expect(
+              stubs.runHelpers.handleRequires,
+              'to have a call satisfying',
+              ['foo']
+            ).and('was called once');
           });
 
           it('should handle "--ui"', async function() {
             const argv = {foo: 'bar'};
             await worker.run('some-file.js', serializeJavascript(argv));
 
-            expect(runHelpers.validatePlugin, 'to have a call satisfying', [
-              argv,
-              'ui',
-              MockMocha.interfaces
-            ]).and('was called once');
+            expect(
+              stubs.runHelpers.validatePlugin,
+              'to have a call satisfying',
+              [argv, 'ui', stubs.Mocha.interfaces]
+            ).and('was called once');
           });
 
           it('should call Mocha#run', async function() {
             await worker.run('some-file.js');
-            expect(MockMocha.prototype.run, 'was called once');
+            expect(mocha.run, 'was called once');
           });
 
           it('should remove all uncaughtException listeners', async function() {
@@ -147,7 +153,7 @@ describe('worker', function() {
 
           describe('when serialization succeeds', function() {
             beforeEach(function() {
-              serializer.serialize.returnsArg(0);
+              stubs.serializer.serialize.returnsArg(0);
             });
 
             it('should resolve with a SerializedWorkerResult', async function() {
@@ -161,7 +167,7 @@ describe('worker', function() {
 
           describe('when serialization fails', function() {
             beforeEach(function() {
-              serializer.serialize.throws();
+              stubs.serializer.serialize.throws();
             });
 
             it('should reject', async function() {
@@ -174,7 +180,7 @@ describe('worker', function() {
               await worker.run('some-file.js');
               await worker.run('some-other-file.js');
 
-              expect(runHelpers, 'to satisfy', {
+              expect(stubs.runHelpers, 'to satisfy', {
                 handleRequires: expect.it('was called once'),
                 validatePlugin: expect.it('was called once')
               });
diff --git a/test/unit/hook-timeout.spec.js b/test/unit/hook-timeout.spec.js
index 8c1b1f4735..12d9bdc1a3 100644
--- a/test/unit/hook-timeout.spec.js
+++ b/test/unit/hook-timeout.spec.js
@@ -1,9 +1,11 @@
 'use strict';
 
-before(function(done) {
-  setTimeout(done, 100);
-});
+describe('hook timeout', function() {
+  before(function(done) {
+    setTimeout(done, 100);
+  });
 
-it('should work', function(done) {
-  done();
+  it('should work', function(done) {
+    done();
+  });
 });