diff --git a/build/.mocha.unittests.js.opts b/build/.mocha.unittests.js.opts
new file mode 100644
index 000000000000..314f85a1d3a9
--- /dev/null
+++ b/build/.mocha.unittests.js.opts
@@ -0,0 +1,8 @@
+--require source-map-support/register
+--require out/test/unittests.js
+--reporter mocha-multi-reporters
+--reporter-options configFile=build/.mocha-multi-reporters.config
+--ui tdd
+--recursive
+--colors
+./out/test/**/*.unit.test.js 
\ No newline at end of file
diff --git a/build/.mocha.unittests.ts.opts b/build/.mocha.unittests.ts.opts
new file mode 100644
index 000000000000..f6672aed1db6
--- /dev/null
+++ b/build/.mocha.unittests.ts.opts
@@ -0,0 +1,8 @@
+--require ts-node/register
+--require out/test/unittests.js
+--reporter mocha-multi-reporters
+--reporter-options configFile=build/.mocha-multi-reporters.config
+--ui tdd
+--recursive
+--colors
+./src/test/**/*.unit.test.ts
\ No newline at end of file
diff --git a/build/.nycrc b/build/.nycrc
new file mode 100644
index 000000000000..c174fccfae18
--- /dev/null
+++ b/build/.nycrc
@@ -0,0 +1,10 @@
+{
+    "extends": "@istanbuljs/nyc-config-typescript",
+    "all": true,
+    "reporter": ["lcov", "html", "text", "text-summary", "cobertura"],
+    "include": [
+        "src/client/**/*.ts", "src/test/**/*.js",
+        "src/datascience-ui/**/*.ts", "src/datascience-ui/**/*.js"
+    ],
+    "exclude": ["src/test/**/*.ts", "src/test/**/*.js"]
+}
\ No newline at end of file
diff --git a/build/ci/templates/test_phases.yml b/build/ci/templates/test_phases.yml
index 0fe88668b727..2cade83866c7 100644
--- a/build/ci/templates/test_phases.yml
+++ b/build/ci/templates/test_phases.yml
@@ -145,15 +145,15 @@ steps:
   # This will only run if the string 'testUnitTests' exists in variable `TestsToRun`
   #
   # Example command line (windows pwsh):
-  # > npm run test:unittests
+  # > npm run test:unittests:cover
   - bash: |
-      npm run test:unittests
-    displayName: 'run test:unittest'
+      npm run test:unittests:cover
+    displayName: 'run test:unittests'
     condition: and(succeeded(), contains(variables['TestsToRun'], 'testUnitTests'))
 
   # Upload the test results to Azure DevOps to facilitate test reporting in their UX.
   - task: PublishTestResults@2
-    displayName: 'Publish test:unittest results'
+    displayName: 'Publish test:unittests results'
     condition: contains(variables['TestsToRun'], 'testUnitTests')
     inputs:
       testResultsFiles: '$(MOCHA_FILE)'
@@ -161,6 +161,15 @@ steps:
       buildPlatform: '$(Agent.Os)-Py$(pythonVersion)'
       buildConfiguration: 'UnitTests'
 
+  # Publish Code Coverage Results
+  - task: PublishCodeCoverageResults@1
+    displayName: 'Publish test:unittests coverage results'
+    condition: contains(variables['TestsToRun'], 'testUnitTests')
+    inputs:
+      codeCoverageTool: 'cobertura'
+      summaryFileLocation: "$(System.DefaultWorkingDirectory)/coverage/cobertura-coverage.xml"
+      reportDirectory: "$(System.DefaultWorkingDirectory)/coverage"
+
   # Install the requirements for the Python or the system tests. This includes the supporting libs that
   # we ship in our extension such as PTVSD and Jedi.
   #
diff --git a/news/3 Code Health/4472.md b/news/3 Code Health/4472.md
new file mode 100644
index 000000000000..7c9113a93bed
--- /dev/null
+++ b/news/3 Code Health/4472.md	
@@ -0,0 +1 @@
+Add code coverage reporting.
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 48564aa5f2d6..c4d3d25931cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1362,6 +1362,12 @@
                 "through2": "^2.0.3"
             }
         },
+        "@istanbuljs/nyc-config-typescript": {
+            "version": "0.1.3",
+            "resolved": "https://registry.npmjs.org/@istanbuljs/nyc-config-typescript/-/nyc-config-typescript-0.1.3.tgz",
+            "integrity": "sha512-EzRFg92bRSD1W/zeuNkeGwph0nkWf+pP2l/lYW4/5hav7RjKKBN5kV1Ix7Tvi0CMu3pC4Wi/U7rNisiJMR3ORg==",
+            "dev": true
+        },
         "@jupyterlab/coreutils": {
             "version": "2.2.1",
             "resolved": "https://registry.npmjs.org/@jupyterlab/coreutils/-/coreutils-2.2.1.tgz",
@@ -1691,15 +1697,6 @@
             "integrity": "sha1-AFLBNvUkgAJCjjY4s33ko5gYZB0=",
             "dev": true
         },
-        "@types/commander": {
-            "version": "2.12.2",
-            "resolved": "https://registry.npmjs.org/@types/commander/-/commander-2.12.2.tgz",
-            "integrity": "sha512-0QEFiR8ljcHp9bAbWxecjVRuAMr16ivPiGOw6KFQBVrVd0RQIcM3xKdRisH2EDWgVWujiYtHwhSkSUoAAGzH7Q==",
-            "dev": true,
-            "requires": {
-                "commander": "*"
-            }
-        },
         "@types/copy-webpack-plugin": {
             "version": "4.4.2",
             "resolved": "https://registry.npmjs.org/@types/copy-webpack-plugin/-/copy-webpack-plugin-4.4.2.tgz",
@@ -2617,6 +2614,15 @@
                 "buffer-equal": "^1.0.0"
             }
         },
+        "append-transform": {
+            "version": "1.0.0",
+            "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+            "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
+            "dev": true,
+            "requires": {
+                "default-require-extensions": "^2.0.0"
+            }
+        },
         "applicationinsights": {
             "version": "1.0.6",
             "resolved": "https://registry.npmjs.org/applicationinsights/-/applicationinsights-1.0.6.tgz",
@@ -2654,6 +2660,12 @@
                 "readable-stream": "^2.0.6"
             }
         },
+        "arg": {
+            "version": "4.1.0",
+            "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.0.tgz",
+            "integrity": "sha512-ZWc51jO3qegGkVh8Hwpv636EkbesNV5ZNQPCtRa+0qytRYPEs9IYT9qITY9buezqUH5uqyzlWLcufrzU2rffdg==",
+            "dev": true
+        },
         "argparse": {
             "version": "1.0.10",
             "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -2662,12 +2674,6 @@
                 "sprintf-js": "~1.0.2"
             }
         },
-        "argv": {
-            "version": "0.0.2",
-            "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
-            "integrity": "sha1-7L0W+JSbFXGDcRsb2jNPN4QBhas=",
-            "dev": true
-        },
         "arr-diff": {
             "version": "4.0.0",
             "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -3919,6 +3925,42 @@
                 }
             }
         },
+        "caching-transform": {
+            "version": "3.0.2",
+            "resolved": "https://registry.npmjs.org/caching-transform/-/caching-transform-3.0.2.tgz",
+            "integrity": "sha512-Mtgcv3lh3U0zRii/6qVgQODdPA4G3zhG+jtbCWj39RXuUFTMzH0vcdMtaJS1jPowd+It2Pqr6y3NJMQqOqCE2w==",
+            "dev": true,
+            "requires": {
+                "hasha": "^3.0.0",
+                "make-dir": "^2.0.0",
+                "package-hash": "^3.0.0",
+                "write-file-atomic": "^2.4.2"
+            },
+            "dependencies": {
+                "make-dir": {
+                    "version": "2.1.0",
+                    "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
+                    "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
+                    "dev": true,
+                    "requires": {
+                        "pify": "^4.0.1",
+                        "semver": "^5.6.0"
+                    }
+                },
+                "pify": {
+                    "version": "4.0.1",
+                    "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+                    "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+                    "dev": true
+                },
+                "semver": {
+                    "version": "5.7.0",
+                    "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+                    "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+                    "dev": true
+                }
+            }
+        },
         "callsite": {
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/callsite/-/callsite-1.0.0.tgz",
@@ -4926,17 +4968,6 @@
             "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
             "dev": true
         },
-        "codecov": {
-            "version": "3.0.2",
-            "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.0.2.tgz",
-            "integrity": "sha512-9ljtIROIjPIUmMRqO+XuDITDoV8xRrZmA0jcEq6p2hg2+wY9wGmLfreAZGIL72IzUfdEDZaU8+Vjidg1fBQ8GQ==",
-            "dev": true,
-            "requires": {
-                "argv": "0.0.2",
-                "request": "^2.81.0",
-                "urlgrey": "0.4.4"
-            }
-        },
         "collapse-white-space": {
             "version": "1.0.4",
             "resolved": "https://registry.npmjs.org/collapse-white-space/-/collapse-white-space-1.0.4.tgz",
@@ -5034,9 +5065,9 @@
             "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag=="
         },
         "commandpost": {
-            "version": "1.3.0",
-            "resolved": "https://registry.npmjs.org/commandpost/-/commandpost-1.3.0.tgz",
-            "integrity": "sha512-T62tyrmYTkaRDbV2z1k2yXTyxk0cFptXYwo1cUbnfHtp7ThLgQ9/90jG1Ym5WLZgFhvOTaHA5VSARWJ9URpLDw==",
+            "version": "1.4.0",
+            "resolved": "https://registry.npmjs.org/commandpost/-/commandpost-1.4.0.tgz",
+            "integrity": "sha512-aE2Y4MTFJ870NuB/+2z1cXBhSBBzRydVVjzhFC4gtenEhpnj15yu0qptWGJsO9YGrcPZ3ezX8AWb1VA391MKpQ==",
             "dev": true
         },
         "comment-json": {
@@ -5283,6 +5314,43 @@
                 }
             }
         },
+        "cp-file": {
+            "version": "6.2.0",
+            "resolved": "https://registry.npmjs.org/cp-file/-/cp-file-6.2.0.tgz",
+            "integrity": "sha512-fmvV4caBnofhPe8kOcitBwSn2f39QLjnAnGq3gO9dfd75mUytzKNZB1hde6QHunW2Rt+OwuBOMc3i1tNElbszA==",
+            "dev": true,
+            "requires": {
+                "graceful-fs": "^4.1.2",
+                "make-dir": "^2.0.0",
+                "nested-error-stacks": "^2.0.0",
+                "pify": "^4.0.1",
+                "safe-buffer": "^5.0.1"
+            },
+            "dependencies": {
+                "make-dir": {
+                    "version": "2.1.0",
+                    "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
+                    "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
+                    "dev": true,
+                    "requires": {
+                        "pify": "^4.0.1",
+                        "semver": "^5.6.0"
+                    }
+                },
+                "pify": {
+                    "version": "4.0.1",
+                    "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+                    "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+                    "dev": true
+                },
+                "semver": {
+                    "version": "5.7.0",
+                    "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+                    "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+                    "dev": true
+                }
+            }
+        },
         "create-ecdh": {
             "version": "4.0.3",
             "resolved": "https://registry.npmjs.org/create-ecdh/-/create-ecdh-4.0.3.tgz",
@@ -6020,6 +6088,15 @@
                 }
             }
         },
+        "default-require-extensions": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/default-require-extensions/-/default-require-extensions-2.0.0.tgz",
+            "integrity": "sha1-9fj7sYp9bVCyH2QfZJ67Uiz+JPc=",
+            "dev": true,
+            "requires": {
+                "strip-bom": "^3.0.0"
+            }
+        },
         "default-resolution": {
             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/default-resolution/-/default-resolution-2.0.0.tgz",
@@ -6431,6 +6508,42 @@
                 "jsbn": "~0.1.0"
             }
         },
+        "editorconfig": {
+            "version": "0.15.3",
+            "resolved": "https://registry.npmjs.org/editorconfig/-/editorconfig-0.15.3.tgz",
+            "integrity": "sha512-M9wIMFx96vq0R4F+gRpY3o2exzb8hEj/n9S8unZtHSvYjibBp/iMufSzvmOcV/laG0ZtuTVGtiJggPOSW2r93g==",
+            "dev": true,
+            "requires": {
+                "commander": "^2.19.0",
+                "lru-cache": "^4.1.5",
+                "semver": "^5.6.0",
+                "sigmund": "^1.0.1"
+            },
+            "dependencies": {
+                "commander": {
+                    "version": "2.20.0",
+                    "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
+                    "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+                    "dev": true
+                },
+                "lru-cache": {
+                    "version": "4.1.5",
+                    "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.5.tgz",
+                    "integrity": "sha512-sWZlbEP2OsHNkXrMl5GYk/jKk70MBng6UU4YI/qGDYbgf6YbP4EvmqISbXCoJiRKs+1bSpFHVgQxvJ17F2li5g==",
+                    "dev": true,
+                    "requires": {
+                        "pseudomap": "^1.0.2",
+                        "yallist": "^2.1.2"
+                    }
+                },
+                "semver": {
+                    "version": "5.7.0",
+                    "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+                    "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+                    "dev": true
+                }
+            }
+        },
         "ee-first": {
             "version": "1.1.1",
             "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
@@ -6653,6 +6766,12 @@
                 "next-tick": "1"
             }
         },
+        "es6-error": {
+            "version": "4.1.1",
+            "resolved": "https://registry.npmjs.org/es6-error/-/es6-error-4.1.1.tgz",
+            "integrity": "sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==",
+            "dev": true
+        },
         "es6-iterator": {
             "version": "2.0.3",
             "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
@@ -7556,6 +7675,28 @@
             "resolved": "https://registry.npmjs.org/foreach/-/foreach-2.0.5.tgz",
             "integrity": "sha1-C+4AUBiusmDQo6865ljdATbsG5k="
         },
+        "foreground-child": {
+            "version": "1.5.6",
+            "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-1.5.6.tgz",
+            "integrity": "sha1-T9ca0t/elnibmApcCilZN8svXOk=",
+            "dev": true,
+            "requires": {
+                "cross-spawn": "^4",
+                "signal-exit": "^3.0.0"
+            },
+            "dependencies": {
+                "cross-spawn": {
+                    "version": "4.0.2",
+                    "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-4.0.2.tgz",
+                    "integrity": "sha1-e5JHYhwjrf3ThWAEqCPL45dCTUE=",
+                    "dev": true,
+                    "requires": {
+                        "lru-cache": "^4.0.1",
+                        "which": "^1.2.9"
+                    }
+                }
+            }
+        },
         "forever-agent": {
             "version": "0.6.1",
             "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
@@ -9030,6 +9171,32 @@
                 "duplexer": "^0.1.1"
             }
         },
+        "handlebars": {
+            "version": "4.1.2",
+            "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.1.2.tgz",
+            "integrity": "sha512-nvfrjqvt9xQ8Z/w0ijewdD/vvWDTOweBUm96NTr66Wfvo1mJenBLwcYmPs3TIBP5ruzYGD7Hx/DaM9RmhroGPw==",
+            "dev": true,
+            "requires": {
+                "neo-async": "^2.6.0",
+                "optimist": "^0.6.1",
+                "source-map": "^0.6.1",
+                "uglify-js": "^3.1.4"
+            },
+            "dependencies": {
+                "neo-async": {
+                    "version": "2.6.1",
+                    "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.1.tgz",
+                    "integrity": "sha512-iyam8fBuCUpWeKPGpaNMetEocMt364qkCsfL9JuhjXX6dRnguRVOfk2GZaDpPjcOKiiXCPINZC1GczQ7iTq3Zw==",
+                    "dev": true
+                },
+                "source-map": {
+                    "version": "0.6.1",
+                    "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+                    "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+                    "dev": true
+                }
+            }
+        },
         "har-schema": {
             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
@@ -9060,6 +9227,12 @@
                 "ansi-regex": "^2.0.0"
             }
         },
+        "has-flag": {
+            "version": "3.0.0",
+            "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+            "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+            "dev": true
+        },
         "has-symbol-support-x": {
             "version": "1.4.2",
             "resolved": "https://registry.npmjs.org/has-symbol-support-x/-/has-symbol-support-x-1.4.2.tgz",
@@ -9137,6 +9310,15 @@
                 "minimalistic-assert": "^1.0.1"
             }
         },
+        "hasha": {
+            "version": "3.0.0",
+            "resolved": "https://registry.npmjs.org/hasha/-/hasha-3.0.0.tgz",
+            "integrity": "sha1-UqMvq4Vp1BymmmH/GiFPjrfIvTk=",
+            "dev": true,
+            "requires": {
+                "is-stream": "^1.0.1"
+            }
+        },
         "he": {
             "version": "1.1.1",
             "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
@@ -10178,108 +10360,362 @@
             "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
             "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo="
         },
-        "isurl": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/isurl/-/isurl-1.0.0.tgz",
-            "integrity": "sha512-1P/yWsxPlDtn7QeRD+ULKQPaIaN6yF368GZ2vDfv0AL0NwpStafjWCDDdn0k8wgFMWpVAqG7oJhxHnlud42i9w==",
-            "dev": true,
-            "requires": {
-                "has-to-string-tag-x": "^1.2.0",
-                "is-object": "^1.0.1"
-            }
-        },
-        "jquery": {
-            "version": "3.4.1",
-            "resolved": "https://registry.npmjs.org/jquery/-/jquery-3.4.1.tgz",
-            "integrity": "sha512-36+AdBzCL+y6qjw5Tx7HgzeGCzC81MDDgaUP8ld2zhx58HdqXGoBd+tHdrBMiyjGQs0Hxs/MLZTu/eHNJJuWPw=="
-        },
-        "jquery-ui": {
-            "version": "1.12.1",
-            "resolved": "https://registry.npmjs.org/jquery-ui/-/jquery-ui-1.12.1.tgz",
-            "integrity": "sha1-vLQEXI3QU5wTS8FIjN0+dop6nlE="
-        },
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+            "integrity": "sha1-CXALflB0Mpc5Mw5TXFqQ+2eFFzA=",
+            "dev": true,
+            "requires": {
+                "es6-error": "^4.0.1"
+            }
+        },
         "remark-parse": {
             "version": "5.0.0",
             "resolved": "https://registry.npmjs.org/remark-parse/-/remark-parse-5.0.0.tgz",
@@ -15196,9 +15958,9 @@
             }
         },
         "source-map-support": {
-            "version": "0.5.9",
-            "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.9.tgz",
-            "integrity": "sha512-gR6Rw4MvUlYy83vP0vxoVNzM6t8MUXqNuRsuBmBHQDu1Fh6X015FrLdgoDKcNdkwGubozq0P4N0Q37UyFVr1EA==",
+            "version": "0.5.12",
+            "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.12.tgz",
+            "integrity": "sha512-4h2Pbvyy15EE02G+JOZpUCmqWJuqrs+sEkzewTm++BPi7Hvn/HwcqLAcNxYAyI0x13CpPPn+kMjl+hplXMHITQ==",
             "dev": true,
             "requires": {
                 "buffer-from": "^1.0.0",
@@ -15225,6 +15987,20 @@
             "integrity": "sha512-dSO0DDYUahUt/0/pD/Is3VIm5TGJjludZ0HVymmhYF6eNA53PVLhnUk0znSYbH8IYBuJdCE+1luR22jNLMaQdw==",
             "dev": true
         },
+        "spawn-wrap": {
+            "version": "1.4.2",
+            "resolved": "https://registry.npmjs.org/spawn-wrap/-/spawn-wrap-1.4.2.tgz",
+            "integrity": "sha512-vMwR3OmmDhnxCVxM8M+xO/FtIp6Ju/mNaDfCMMW7FDcLRTPFWUswec4LXJHTJE2hwTI9O0YBfygu4DalFl7Ylg==",
+            "dev": true,
+            "requires": {
+                "foreground-child": "^1.5.6",
+                "mkdirp": "^0.5.0",
+                "os-homedir": "^1.0.1",
+                "rimraf": "^2.6.2",
+                "signal-exit": "^3.0.2",
+                "which": "^1.3.0"
+            }
+        },
         "spdx-correct": {
             "version": "3.0.0",
             "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.0.0.tgz",
@@ -16131,6 +16907,117 @@
                 }
             }
         },
+        "test-exclude": {
+            "version": "5.2.3",
+            "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
+            "integrity": "sha512-M+oxtseCFO3EDtAaGH7iiej3CBkzXqFMbzqYAACdzKui4eZA+pq3tZEwChvOdNfa7xxy8BfbmgJSIr43cC/+2g==",
+            "dev": true,
+            "requires": {
+                "glob": "^7.1.3",
+                "minimatch": "^3.0.4",
+                "read-pkg-up": "^4.0.0",
+                "require-main-filename": "^2.0.0"
+            },
+            "dependencies": {
+                "find-up": {
+                    "version": "3.0.0",
+                    "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+                    "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+                    "dev": true,
+                    "requires": {
+                        "locate-path": "^3.0.0"
+                    }
+                },
+                "glob": {
+                    "version": "7.1.4",
+                    "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.4.tgz",
+                    "integrity": "sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==",
+                    "dev": true,
+                    "requires": {
+                        "fs.realpath": "^1.0.0",
+                        "inflight": "^1.0.4",
+                        "inherits": "2",
+                        "minimatch": "^3.0.4",
+                        "once": "^1.3.0",
+                        "path-is-absolute": "^1.0.0"
+                    }
+                },
+                "load-json-file": {
+                    "version": "4.0.0",
+                    "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-4.0.0.tgz",
+                    "integrity": "sha1-L19Fq5HjMhYjT9U62rZo607AmTs=",
+                    "dev": true,
+                    "requires": {
+                        "graceful-fs": "^4.1.2",
+                        "parse-json": "^4.0.0",
+                        "pify": "^3.0.0",
+                        "strip-bom": "^3.0.0"
+                    }
+                },
+                "locate-path": {
+                    "version": "3.0.0",
+                    "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+                    "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+                    "dev": true,
+                    "requires": {
+                        "p-locate": "^3.0.0",
+                        "path-exists": "^3.0.0"
+                    }
+                },
+                "parse-json": {
+                    "version": "4.0.0",
+                    "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-4.0.0.tgz",
+                    "integrity": "sha1-vjX1Qlvh9/bHRxhPmKeIy5lHfuA=",
+                    "dev": true,
+                    "requires": {
+                        "error-ex": "^1.3.1",
+                        "json-parse-better-errors": "^1.0.1"
+                    }
+                },
+                "path-exists": {
+                    "version": "3.0.0",
+                    "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+                    "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+                    "dev": true
+                },
+                "path-type": {
+                    "version": "3.0.0",
+                    "resolved": "https://registry.npmjs.org/path-type/-/path-type-3.0.0.tgz",
+                    "integrity": "sha512-T2ZUsdZFHgA3u4e5PfPbjd7HDDpxPnQb5jN0SrDsjNSuVXHJqtwTnWqG0B1jZrgmJ/7lj1EmVIByWt1gxGkWvg==",
+                    "dev": true,
+                    "requires": {
+                        "pify": "^3.0.0"
+                    }
+                },
+                "read-pkg": {
+                    "version": "3.0.0",
+                    "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-3.0.0.tgz",
+                    "integrity": "sha1-nLxoaXj+5l0WwA4rGcI3/Pbjg4k=",
+                    "dev": true,
+                    "requires": {
+                        "load-json-file": "^4.0.0",
+                        "normalize-package-data": "^2.3.2",
+                        "path-type": "^3.0.0"
+                    }
+                },
+                "read-pkg-up": {
+                    "version": "4.0.0",
+                    "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-4.0.0.tgz",
+                    "integrity": "sha512-6etQSH7nJGsK0RbG/2TeDzZFa8shjQ1um+SwQQ5cwKy0dhSXdOncEhb1CPpvQG4h7FyOV6EB6YlV0yJvZQNAkA==",
+                    "dev": true,
+                    "requires": {
+                        "find-up": "^3.0.0",
+                        "read-pkg": "^3.0.0"
+                    }
+                },
+                "require-main-filename": {
+                    "version": "2.0.0",
+                    "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+                    "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+                    "dev": true
+                }
+            }
+        },
         "text-hex": {
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/text-hex/-/text-hex-1.0.0.tgz",
@@ -16508,6 +17395,27 @@
                 "lodash": "^4.17.5"
             }
         },
+        "ts-node": {
+            "version": "8.3.0",
+            "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-8.3.0.tgz",
+            "integrity": "sha512-dyNS/RqyVTDcmNM4NIBAeDMpsAdaQ+ojdf0GOLqE6nwJOgzEkdRNzJywhDfwnuvB10oa6NLVG1rUJQCpRN7qoQ==",
+            "dev": true,
+            "requires": {
+                "arg": "^4.1.0",
+                "diff": "^4.0.1",
+                "make-error": "^1.1.1",
+                "source-map-support": "^0.5.6",
+                "yn": "^3.0.0"
+            },
+            "dependencies": {
+                "diff": {
+                    "version": "4.0.1",
+                    "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.1.tgz",
+                    "integrity": "sha512-s2+XdvhPCOF01LRQBC8hf4vhbVmI2CGS5aZnxLJlT5FtdhPCDFq80q++zK2KlrVorVDdL5BOGZ/VfLrVtYNF+Q==",
+                    "dev": true
+                }
+            }
+        },
         "tsconfig-paths": {
             "version": "3.7.0",
             "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.7.0.tgz",
@@ -16820,39 +17728,13 @@
             "integrity": "sha1-VY/tpzfHZaYQtzfu+7F3Xum8jas="
         },
         "typescript-formatter": {
-            "version": "7.2.0",
-            "resolved": "https://registry.npmjs.org/typescript-formatter/-/typescript-formatter-7.2.0.tgz",
-            "integrity": "sha512-A16UqkHtkQOF340cf21LJXchcftyBTPqNOAmP1J8Plu2m3Q8o+2fAYwgFjLXMKP6ooSPjDoOS6z8j9q+1nEnXg==",
+            "version": "7.2.2",
+            "resolved": "https://registry.npmjs.org/typescript-formatter/-/typescript-formatter-7.2.2.tgz",
+            "integrity": "sha512-V7vfI9XArVhriOTYHPzMU2WUnm5IMdu9X/CPxs8mIMGxmTBFpDABlbkBka64PZJ9/xgQeRpK8KzzAG4MPzxBDQ==",
             "dev": true,
             "requires": {
                 "commandpost": "^1.0.0",
                 "editorconfig": "^0.15.0"
-            },
-            "dependencies": {
-                "editorconfig": {
-                    "version": "0.15.0",
-                    "resolved": "https://registry.npmjs.org/editorconfig/-/editorconfig-0.15.0.tgz",
-                    "integrity": "sha512-j7JBoj/bpNzvoTQylfRZSc85MlLNKWQiq5y6gwKhmqD2h1eZ+tH4AXbkhEJD468gjDna/XMx2YtSkCxBRX9OGg==",
-                    "dev": true,
-                    "requires": {
-                        "@types/commander": "^2.11.0",
-                        "@types/semver": "^5.4.0",
-                        "commander": "^2.11.0",
-                        "lru-cache": "^4.1.1",
-                        "semver": "^5.4.1",
-                        "sigmund": "^1.0.1"
-                    }
-                },
-                "lru-cache": {
-                    "version": "4.1.3",
-                    "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.3.tgz",
-                    "integrity": "sha512-fFEhvcgzuIoJVUF8fYr5KR0YqxD238zgObTps31YdADwPPAp82a4M8TrckkWyx7ekNlf9aBcVn81cFwwXngrJA==",
-                    "dev": true,
-                    "requires": {
-                        "pseudomap": "^1.0.2",
-                        "yallist": "^2.1.2"
-                    }
-                }
             }
         },
         "ua-parser-js": {
@@ -16867,6 +17749,33 @@
             "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA==",
             "dev": true
         },
+        "uglify-js": {
+            "version": "3.6.0",
+            "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
+            "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
+            "dev": true,
+            "optional": true,
+            "requires": {
+                "commander": "~2.20.0",
+                "source-map": "~0.6.1"
+            },
+            "dependencies": {
+                "commander": {
+                    "version": "2.20.0",
+                    "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
+                    "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+                    "dev": true,
+                    "optional": true
+                },
+                "source-map": {
+                    "version": "0.6.1",
+                    "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+                    "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+                    "dev": true,
+                    "optional": true
+                }
+            }
+        },
         "uint64be": {
             "version": "1.0.1",
             "resolved": "https://registry.npmjs.org/uint64be/-/uint64be-1.0.1.tgz",
@@ -17373,12 +18282,6 @@
             "integrity": "sha1-FQWgOiiaSMvXpDTvuu7FBV9WM6k=",
             "dev": true
         },
-        "urlgrey": {
-            "version": "0.4.4",
-            "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-0.4.4.tgz",
-            "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
-            "dev": true
-        },
         "use": {
             "version": "3.1.0",
             "resolved": "https://registry.npmjs.org/use/-/use-3.1.0.tgz",
@@ -18667,6 +19570,17 @@
             "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
             "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
         },
+        "write-file-atomic": {
+            "version": "2.4.3",
+            "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.3.tgz",
+            "integrity": "sha512-GaETH5wwsX+GcnzhPgKcKjJ6M2Cq3/iZp1WyY/X1CSqrW+jVNM9Y7D8EC2sM4ZG/V8wZlSniJnCKWPmBYAucRQ==",
+            "dev": true,
+            "requires": {
+                "graceful-fs": "^4.1.11",
+                "imurmurhash": "^0.1.4",
+                "signal-exit": "^3.0.2"
+            }
+        },
         "ws": {
             "version": "6.2.1",
             "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
@@ -18940,6 +19854,12 @@
                 "buffer-crc32": "~0.2.3"
             }
         },
+        "yn": {
+            "version": "3.1.0",
+            "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
+            "integrity": "sha512-kKfnnYkbTfrAdd0xICNFw7Atm8nKpLcLv9AZGEt+kczL/WQVai4e2V6ZN8U/O+iI6WrNuJjNNOyu4zfhl9D3Hg==",
+            "dev": true
+        },
         "zone.js": {
             "version": "0.7.6",
             "resolved": "https://registry.npmjs.org/zone.js/-/zone.js-0.7.6.tgz",
diff --git a/package.json b/package.json
index 3fec8a14ed6a..6978e374122d 100644
--- a/package.json
+++ b/package.json
@@ -2181,8 +2181,8 @@
         "compile-webviews-verbose": "npx webpack --config webpack.datascience-ui.config.js",
         "postinstall": "node ./node_modules/vscode/bin/install && node ./build/ci/postInstall.js",
         "test": "node ./out/test/standardTest.js && node ./out/test/multiRootTest.js",
-        "test:unittests": "mocha --require source-map-support/register --opts ./build/.mocha.unittests.opts",
-        "test:unittests:cover": "npm run test:unittests",
+        "test:unittests": "mocha --opts ./build/.mocha.unittests.js.opts",
+        "test:unittests:cover": "nyc --nycrc-path build/.nycrc mocha --opts ./build/.mocha.unittests.ts.opts",
         "test:functional": "mocha --require source-map-support/register --opts ./build/.mocha.functional.opts",
         "test:functional:cover": "npm run test:functional",
         "testDebugger": "node ./out/test/testBootstrap.js ./out/test/debuggerTest.js",
@@ -2263,6 +2263,7 @@
         "@babel/preset-env": "^7.1.0",
         "@babel/preset-react": "^7.0.0",
         "@babel/register": "^7.4.4",
+        "@istanbuljs/nyc-config-typescript": "^0.1.3",
         "@nteract/plotly": "^1.47.1",
         "@nteract/transform-dataresource": "^4.3.5",
         "@nteract/transform-geojson": "^3.2.3",
@@ -2326,7 +2327,6 @@
         "chai": "^4.1.2",
         "chai-arrays": "^2.0.0",
         "chai-as-promised": "^7.1.1",
-        "codecov": "^3.0.0",
         "colors": "^1.2.1",
         "copy-webpack-plugin": "^4.6.0",
         "cross-spawn": "^6.0.5",
@@ -2362,6 +2362,7 @@
         "monaco-editor-webpack-plugin": "^1.7.0",
         "node-has-native-dependencies": "^1.0.2",
         "node-html-parser": "^1.1.13",
+        "nyc": "^14.1.1",
         "raw-loader": "^0.5.1",
         "react": "^16.5.2",
         "react-data-grid": "^6.0.2-0",
@@ -2375,6 +2376,7 @@
         "sass-loader": "^7.1.0",
         "shortid": "^2.2.8",
         "sinon": "^7.3.2",
+        "source-map-support": "^0.5.12",
         "style-loader": "^0.23.1",
         "styled-jsx": "^3.1.0",
         "svg-inline-loader": "^0.8.0",
@@ -2383,6 +2385,7 @@
         "transform-loader": "^0.2.4",
         "ts-loader": "^5.3.0",
         "ts-mockito": "^2.3.1",
+        "ts-node": "^8.3.0",
         "tsconfig-paths-webpack-plugin": "^3.2.0",
         "tslint-eslint-rules": "^5.1.0",
         "tslint-microsoft-contrib": "^5.0.3",
diff --git a/src/test/common/platform/filesystem.unit.test.ts b/src/test/common/platform/filesystem.unit.test.ts
index 6202f1fe394d..04fd6f62a01a 100644
--- a/src/test/common/platform/filesystem.unit.test.ts
+++ b/src/test/common/platform/filesystem.unit.test.ts
@@ -81,7 +81,8 @@ suite('FileSystem', () => {
         expect(fileContents).to.be.equal(dataToAppend);
     });
     test('Test searching for files', async () => {
-        const files = await fileSystem.search(path.join(__dirname, '*.js'));
+        const searchPattern = `${path.basename(__filename, __filename.substring(__filename.length - 3))}.*`;
+        const files = await fileSystem.search(path.join(__dirname, searchPattern));
         expect(files).to.be.array();
         expect(files.length).to.be.at.least(1);
         const expectedFileName = __filename.replace(/\\/g, '/');