1 files changed, 31 insertions, 0 deletions
diff --git a/date-fns/test/formatRFC3339/poland.js b/date-fns/test/formatRFC3339/poland.js
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+++ b/date-fns/test/formatRFC3339/poland.js
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+import formatRFC3339 from '../../src/formatRFC3339'
+import assert from 'assert'
+
+/**
+ * Europe/Warsaw (Poland) is regular full-hours timezone
+ */
+if (process.env.TZ !== 'Europe/Warsaw')
+  throw new Error(
+    'The test must be run with TZ=Europe/Warsaw (UTC+02:00 or UTC+01:00)'
+  )
+
+if (parseInt(process.version.match(/^v(\d+)\./)[1]) < 10)
+  throw new Error('The test must be run on Node.js version >= 10')
+
+// Old date
+assert.equal(
+  formatRFC3339(new Date(1986, 3, 4, 10, 33, 1)),
+  '1986-04-04T10:33:01+02:00'
+)
+
+// Standard time (Warsaw have +01:00)
+assert.equal(
+  formatRFC3339(new Date(2020, 0, 23, 5, 0, 54)),
+  '2020-01-23T05:00:54+01:00'
+)
+
+// Summer time (Warsaw have +02:00)
+assert.equal(
+  formatRFC3339(new Date(2020, 6, 30, 20, 59, 1)),
+  '2020-07-30T20:59:01+02:00'
+)