test: added checks for command existence before running nat tests

Author: emmacasolin

package-lock.json

@@ -137,6 +137,7 @@
     "node-gyp-build": "4.4.0",
     "pkg": "5.6.0",
     "prettier": "^2.6.2",
+    "shelljs": "^0.8.5",
     "shx": "^0.3.4",
     "ts-jest": "^27.0.5",
     "ts-node": "^10.4.0",

package.json

@@ -2,12 +2,17 @@ import os from 'os';
 import path from 'path';
 import fs from 'fs';
 import process from 'process';
+import shell from 'shelljs';
 import Logger, { LogLevel, StreamHandler } from '@matrixai/logger';
 import * as testNatUtils from './utils';
 import { describeIf } from '../utils';
 
 describeIf(
-  process.platform === 'linux',
+  process.platform === 'linux' &&
+    shell.which('ip') &&
+    shell.which('iptables') &&
+    shell.which('nsenter') &&
+    shell.which('unshare'),
   'endpoint dependent NAT traversal',
   () => {
     const logger = new Logger('EDM NAT test', LogLevel.WARN, [

tests/nat/endpointDependentNAT.test.ts

@@ -2,12 +2,17 @@ import os from 'os';
 import path from 'path';
 import fs from 'fs';
 import process from 'process';
+import shell from 'shelljs';
 import Logger, { LogLevel, StreamHandler } from '@matrixai/logger';
 import * as testNatUtils from './utils';
 import { describeIf } from '../utils';
 
 describeIf(
-  process.platform === 'linux',
+  process.platform === 'linux' &&
+    shell.which('ip') &&
+    shell.which('iptables') &&
+    shell.which('nsenter') &&
+    shell.which('unshare'),
   'endpoint independent NAT traversal',
   () => {
     const logger = new Logger('EIM NAT test', LogLevel.WARN, [