diff --git a/editors/code/package-lock.json b/editors/code/package-lock.json
index 56cac1b494..5ffd8b0bd0 100644
--- a/editors/code/package-lock.json
+++ b/editors/code/package-lock.json
@@ -24,6 +24,29 @@
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-            "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-            "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
-            "dev": true
-        },
-        "verror": {
-            "version": "1.10.0",
-            "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
-            "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-            "dev": true,
-            "requires": {
-                "assert-plus": "^1.0.0",
-                "core-util-is": "1.0.2",
-                "extsprintf": "^1.2.0"
-            }
-        },
         "vsce": {
             "version": "1.66.0",
             "resolved": "https://registry.npmjs.org/vsce/-/vsce-1.66.0.tgz",
@@ -1288,21 +1413,6 @@
                 "yazl": "^2.2.2"
             }
         },
-        "vscode": {
-            "version": "1.1.35",
-            "resolved": "https://registry.npmjs.org/vscode/-/vscode-1.1.35.tgz",
-            "integrity": "sha512-xPnxzQU40LOS2yPyzWW+WKpTV6qA3z16TcgpZ9O38UWLA157Zz4GxUx5H7Gd07pxzw0GqvusbF4D+5GBgNxvEQ==",
-            "dev": true,
-            "requires": {
-                "glob": "^7.1.2",
-                "mocha": "^5.2.0",
-                "request": "^2.88.0",
-                "semver": "^5.4.1",
-                "source-map-support": "^0.5.0",
-                "url-parse": "^1.4.4",
-                "vscode-test": "^0.4.1"
-            }
-        },
         "vscode-jsonrpc": {
             "version": "4.1.0-next.2",
             "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-4.1.0-next.2.tgz",
@@ -1332,13 +1442,85 @@
             "integrity": "sha512-2JkrMWWUi2rlVLSo9OFR2PIGUzdiowEM8NgNYiwLKnXTjpwpjjIrJbNNxDik7Rv4oo9KtikcFQZKXbrKilL/MQ=="
         },
         "vscode-test": {
-            "version": "0.4.3",
-            "resolved": "https://registry.npmjs.org/vscode-test/-/vscode-test-0.4.3.tgz",
-            "integrity": "sha512-EkMGqBSefZH2MgW65nY05rdRSko15uvzq4VAPM5jVmwYuFQKE7eikKXNJDRxL+OITXHB6pI+a3XqqD32Y3KC5w==",
+            "version": "1.2.0",
+            "resolved": "https://registry.npmjs.org/vscode-test/-/vscode-test-1.2.0.tgz",
+            "integrity": "sha512-aowqgc8gZe0eflzVUXsBjBrlsJ8eC35kfgfSEeHu9PKA1vQKm/3rVK43TlbxGue8hKtZBElNAJ5QuYklR/vLJA==",
             "dev": true,
             "requires": {
                 "http-proxy-agent": "^2.1.0",
-                "https-proxy-agent": "^2.2.1"
+                "https-proxy-agent": "^2.2.1",
+                "rimraf": "^2.6.3"
+            }
+        },
+        "which": {
+            "version": "1.3.1",
+            "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+            "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+            "dev": true,
+            "requires": {
+                "isexe": "^2.0.0"
+            }
+        },
+        "which-module": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+            "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+            "dev": true
+        },
+        "wide-align": {
+            "version": "1.1.3",
+            "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+            "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+            "dev": true,
+            "requires": {
+                "string-width": "^1.0.2 || 2"
+            }
+        },
+        "wrap-ansi": {
+            "version": "2.1.0",
+            "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+            "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+            "dev": true,
+            "requires": {
+                "string-width": "^1.0.1",
+                "strip-ansi": "^3.0.1"
+            },
+            "dependencies": {
+                "ansi-regex": {
+                    "version": "2.1.1",
+                    "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+                    "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+                    "dev": true
+                },
+                "is-fullwidth-code-point": {
+                    "version": "1.0.0",
+                    "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+                    "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+                    "dev": true,
+                    "requires": {
+                        "number-is-nan": "^1.0.0"
+                    }
+                },
+                "string-width": {
+                    "version": "1.0.2",
+                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+                    "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+                    "dev": true,
+                    "requires": {
+                        "code-point-at": "^1.0.0",
+                        "is-fullwidth-code-point": "^1.0.0",
+                        "strip-ansi": "^3.0.0"
+                    }
+                },
+                "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"
+                    }
+                }
             }
         },
         "wrappy": {
@@ -1347,6 +1529,124 @@
             "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
             "dev": true
         },
+        "y18n": {
+            "version": "4.0.0",
+            "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+            "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+            "dev": true
+        },
+        "yargs": {
+            "version": "13.2.2",
+            "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
+            "integrity": "sha512-WyEoxgyTD3w5XRpAQNYUB9ycVH/PQrToaTXdYXRdOXvEy1l19br+VJsc0vcO8PTGg5ro/l/GY7F/JMEBmI0BxA==",
+            "dev": true,
+            "requires": {
+                "cliui": "^4.0.0",
+                "find-up": "^3.0.0",
+                "get-caller-file": "^2.0.1",
+                "os-locale": "^3.1.0",
+                "require-directory": "^2.1.1",
+                "require-main-filename": "^2.0.0",
+                "set-blocking": "^2.0.0",
+                "string-width": "^3.0.0",
+                "which-module": "^2.0.0",
+                "y18n": "^4.0.0",
+                "yargs-parser": "^13.0.0"
+            },
+            "dependencies": {
+                "ansi-regex": {
+                    "version": "4.1.0",
+                    "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+                    "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+                    "dev": true
+                },
+                "string-width": {
+                    "version": "3.1.0",
+                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+                    "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+                    "dev": true,
+                    "requires": {
+                        "emoji-regex": "^7.0.1",
+                        "is-fullwidth-code-point": "^2.0.0",
+                        "strip-ansi": "^5.1.0"
+                    }
+                },
+                "strip-ansi": {
+                    "version": "5.2.0",
+                    "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+                    "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+                    "dev": true,
+                    "requires": {
+                        "ansi-regex": "^4.1.0"
+                    }
+                }
+            }
+        },
+        "yargs-parser": {
+            "version": "13.0.0",
+            "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
+            "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
+            "dev": true,
+            "requires": {
+                "camelcase": "^5.0.0",
+                "decamelize": "^1.2.0"
+            }
+        },
+        "yargs-unparser": {
+            "version": "1.5.0",
+            "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
+            "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
+            "dev": true,
+            "requires": {
+                "flat": "^4.1.0",
+                "lodash": "^4.17.11",
+                "yargs": "^12.0.5"
+            },
+            "dependencies": {
+                "get-caller-file": {
+                    "version": "1.0.3",
+                    "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+                    "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+                    "dev": true
+                },
+                "require-main-filename": {
+                    "version": "1.0.1",
+                    "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+                    "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+                    "dev": true
+                },
+                "yargs": {
+                    "version": "12.0.5",
+                    "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+                    "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+                    "dev": true,
+                    "requires": {
+                        "cliui": "^4.0.0",
+                        "decamelize": "^1.2.0",
+                        "find-up": "^3.0.0",
+                        "get-caller-file": "^1.0.1",
+                        "os-locale": "^3.0.0",
+                        "require-directory": "^2.1.1",
+                        "require-main-filename": "^1.0.1",
+                        "set-blocking": "^2.0.0",
+                        "string-width": "^2.0.0",
+                        "which-module": "^2.0.0",
+                        "y18n": "^3.2.1 || ^4.0.0",
+                        "yargs-parser": "^11.1.1"
+                    }
+                },
+                "yargs-parser": {
+                    "version": "11.1.1",
+                    "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+                    "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+                    "dev": true,
+                    "requires": {
+                        "camelcase": "^5.0.0",
+                        "decamelize": "^1.2.0"
+                    }
+                }
+            }
+        },
         "yauzl": {
             "version": "2.10.0",
             "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
diff --git a/editors/code/package.json b/editors/code/package.json
index 95ec6cff6f..e2bc72f325 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -13,18 +13,17 @@
         "Other"
     ],
     "engines": {
-        "vscode": "^1.33.0"
+        "vscode": "^1.36.0"
     },
     "scripts": {
         "vscode:prepublish": "npm run compile",
         "package": "vsce package",
         "compile": "tsc -p ./ && shx cp src/utils/terminateProcess.sh out/utils/terminateProcess.sh",
         "watch": "tsc -watch -p ./",
-        "postinstall": "node ./node_modules/vscode/bin/install",
         "fix": "prettier **/*.{json,ts} --write && tslint --project . --fix",
         "lint": "tslint --project .",
-        "test": "node node_modules/vscode/bin/test",
         "prettier": "prettier **/*.{json,ts}",
+        "test": "node ./out/test/runTest.js",
         "travis": "npm run compile && npm run test && npm run lint && npm run prettier -- --write && git diff --exit-code"
     },
     "prettier": {
@@ -39,13 +38,17 @@
         "@types/mocha": "^5.2.7",
         "@types/node": "^10.14.13",
         "@types/seedrandom": "^2.4.28",
+        "@types/glob": "^7.1.1",
+        "@types/vscode": "^1.36.0",
+        "glob": "^7.1.4",
+        "mocha": "^6.2.0",
         "prettier": "^1.18.2",
         "shx": "^0.3.1",
         "tslint": "^5.18.0",
         "tslint-config-prettier": "^1.18.0",
         "typescript": "^3.5.3",
         "vsce": "^1.66.0",
-        "vscode": "^1.1.35"
+        "vscode-test": "^1.2.0"
     },
     "activationEvents": [
         "onLanguage:rust",
diff --git a/editors/code/src/test/index.ts b/editors/code/src/test/index.ts
deleted file mode 100644
index 6e565c254a..0000000000
--- a/editors/code/src/test/index.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-//
-// PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING
-//
-// This file is providing the test runner to use when running extension tests.
-// By default the test runner in use is Mocha based.
-//
-// You can provide your own test runner if you want to override it by exporting
-// a function run(testRoot: string, clb: (error:Error) => void) that the extension
-// host can call to run the tests. The test runner is expected to use console.log
-// to report the results back to the caller. When the tests are finished, return
-// a possible error to the callback or null if none.
-
-import * as testRunner from 'vscode/lib/testrunner';
-
-// You can directly control Mocha options by uncommenting the following lines
-// See https://github.com/mochajs/mocha/wiki/Using-mocha-programmatically#set-options for more info
-testRunner.configure({
-    ui: 'bdd', // the TDD UI is being used in extension.test.ts (suite, test, etc.)
-    useColors: true // colored output from test results
-});
-
-module.exports = testRunner;
diff --git a/editors/code/src/test/runTest.ts b/editors/code/src/test/runTest.ts
new file mode 100644
index 0000000000..d880d47df7
--- /dev/null
+++ b/editors/code/src/test/runTest.ts
@@ -0,0 +1,22 @@
+import * as path from 'path';
+
+import { runTests } from 'vscode-test';
+
+async function main() {
+    try {
+        // The folder containing the Extension Manifest package.json
+        // Passed to `--extensionDevelopmentPath`
+        const extensionDevelopmentPath = path.resolve(__dirname, '../../');
+
+        // The path to the extension test runner script
+        // Passed to --extensionTestsPath
+        const extensionTestsPath = path.resolve(__dirname, './utils/index');
+
+        // Download VS Code, unzip it and run the integration test
+        await runTests({ extensionDevelopmentPath, extensionTestsPath });
+    } catch (err) {
+        process.exit(1);
+    }
+}
+
+main();
diff --git a/editors/code/src/test/utils/index.ts b/editors/code/src/test/utils/index.ts
new file mode 100644
index 0000000000..16715a286c
--- /dev/null
+++ b/editors/code/src/test/utils/index.ts
@@ -0,0 +1,49 @@
+//
+// PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING
+//
+// This file is providing the test runner to use when running extension tests.
+// By default the test runner in use is Mocha based.
+//
+// You can provide your own test runner if you want to override it by exporting
+// a function run(testRoot: string, clb: (error:Error) => void) that the extension
+// host can call to run the tests. The test runner is expected to use console.log
+// to report the results back to the caller. When the tests are finished, return
+// a possible error to the callback or null if none.
+
+import * as glob from 'glob';
+import * as Mocha from 'mocha';
+import * as path from 'path';
+
+export function run(): Promise<void> {
+    // Create the mocha test
+    const mocha = new Mocha({
+        ui: 'bdd'
+    });
+    mocha.useColors(true);
+
+    const testsRoot = __dirname;
+
+    return new Promise((c, e) => {
+        glob('**/**.test.js', { cwd: testsRoot }, (err, files) => {
+            if (err) {
+                return e(err);
+            }
+
+            // Add files to the test suite
+            files.forEach(f => mocha.addFile(path.resolve(testsRoot, f)));
+
+            try {
+                // Run the mocha test
+                mocha.run(failures => {
+                    if (failures > 0) {
+                        e(new Error(`${failures} tests failed.`));
+                    } else {
+                        c();
+                    }
+                });
+            } catch (err) {
+                e(err);
+            }
+        });
+    });
+}
diff --git a/editors/code/src/utils/diagnostics/rust.ts b/editors/code/src/utils/diagnostics/rust.ts
index bfb494a3a5..1fb1f7b6dc 100644
--- a/editors/code/src/utils/diagnostics/rust.ts
+++ b/editors/code/src/utils/diagnostics/rust.ts
@@ -64,7 +64,7 @@ function mapLevelToSeverity(s: string): vscode.DiagnosticSeverity {
  * Converts a Rust span to a VsCode location
  */
 function mapSpanToLocation(span: RustDiagnosticSpan): vscode.Location {
-    const fileName = path.join(vscode.workspace.rootPath!, span.file_name);
+    const fileName = path.join(vscode.workspace.rootPath || '', span.file_name);
     const fileUri = vscode.Uri.file(fileName);
 
     const range = new vscode.Range(