Test for formatISO in Asia/Kolkata TZ

scripts/test/formatISO.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# The script runs formatISO in a non%60 timezone offset
+#
+# It's a part of the test process.
+
+set -ex
+
+export PATH="$(yarn bin):$PATH"
+export NODE_ENV=test
+
+env TZ=Asia/Kolkata babel-node ./test/formatISO/india.js

scripts/test/travis.sh

@@ -24,6 +24,7 @@ then
   yarn test --single-run
 
   ./scripts/test/dst.sh
+  ./scripts/test/formatISO.sh
 
   prebuild
   ./scripts/test/tz.sh

test/formatISO/india.js

@@ -0,0 +1,13 @@
+import formatISO from '../../src/formatISO'
+import assert from 'assert'
+
+if (process.env.TZ !== 'Asia/Kolkata')
+  throw new Error('The test must be run with TZ=Asia/Kolkata')
+
+if (parseInt(process.version.match(/^v(\d+)\./)[1]) < 10)
+  throw new Error('The test must be run on Node.js version >= 10')
+
+assert.equal(
+  formatISO(new Date(1986, 3, 4, 10, 33, 1)),
+  '1986-04-04T10:33:01+05:30'
+)