tests: add assert helper for supporting node 10.x

src/tests/backend/assert-legacy.js

@@ -0,0 +1,48 @@
+'use strict';
+// support for older node versions (<12)
+const assert = require('assert');
+
+const internalMatch = (string, regexp, message, fn) => {
+  if (!regexp.test) {
+    throw new Error('regexp parameter is not a RegExp');
+  }
+  if (typeof string !== 'string') {
+    throw new Error('string parameter is not a string');
+  }
+  const match = fn.name === 'match';
+
+  const result = string.match(regexp);
+  if (match && !result) {
+    if (message) {
+      throw message;
+    } else {
+      throw new Error(`${string} does not match regex ${regexp}`);
+    }
+  }
+  if (!match && result) {
+    if (message) {
+      throw message;
+    } else {
+      throw new Error(`${string} does match regex ${regexp}`);
+    }
+  }
+};
+
+
+if (!assert.match) {
+  const match = (string, regexp, message) => {
+    internalMatch(string, regexp, message, match);
+  };
+  assert.match = match;
+}
+if (!assert.strict.match) assert.strict.match = assert.match;
+
+if (!assert.doesNotMatch) {
+  const doesNotMatch = (string, regexp, message) => {
+    internalMatch(string, regexp, message, doesNotMatch);
+  };
+  assert.doesNotMatch = doesNotMatch;
+}
+if (!assert.strict.doesNotMatch) assert.strict.doesNotMatch = assert.doesNotMatch;
+
+module.exports = assert;