e2e: add end-to-end test framework

Set up a Cucumber (TypeScript) test framework in the 'test/e2e' directory.
This commit contains only the infrastructure needed to write and run the
tests; the tests themselves will be added in future commits.

Signed-off-by: Victoria Dye <vdye@github.com>

Author: vdye

.gitignore

@@ -3,3 +3,4 @@
 /bin/
 /_dist/
 /_docs/
+node_modules/

.vscode/settings.json

@@ -1,4 +1,5 @@
 {
+    // File formatting
     "[markdown]": {
         "editor.detectIndentation": false,
         "editor.insertSpaces": false,
@@ -35,5 +36,13 @@
         "prerm": "shellscript",
         "postinstall": "shellscript",
         "Makefile": "makefile"
-    }
+    },
+
+    // Cucumber settings
+    "cucumber.features": [
+        "test/e2e/features/**/*.feature",
+    ],
+    "cucumber.glue": [
+        "test/e2e/features/**/*.ts"
+    ],
 }

test/e2e/cucumber.js

@@ -0,0 +1,11 @@
+module.exports = {
+  default: {
+    requireModule: ['ts-node/register'],
+    require: ['features/**/*.ts'],
+    publishQuiet: true,
+    format: ['progress'],
+    formatOptions: {
+      snippetInterface: 'async-await'
+    },
+  }
+}