From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Sat, 23 Jul 2022 21:24:13 +0000 (+0200)
Subject: ✅ Add JUnit Rule to override locales during tests
X-Git-Url: https://git.pterodactylus.net/?p=Sone.git;a=commitdiff_plain;h=b3c31725b779d0287fff79728227556751f837f2

✅ Add JUnit Rule to override locales during tests

Some tests fail when run with a non-English locale. This was found by debbiedub (see https://github.com/Bombe/Sone/pull/23) but their proposed solution was not quite to my liking.

This TestRule will store the JVM’s current default locale and set a custom locale before running a test. After the test the previous locale will be restored, in order not to mess up any other tests.
---

diff --git a/src/test/kotlin/net/pterodactylus/sone/test/OverrideLocale.kt b/src/test/kotlin/net/pterodactylus/sone/test/OverrideLocale.kt
new file mode 100644
index 0000000..c4b4b0d
--- /dev/null
+++ b/src/test/kotlin/net/pterodactylus/sone/test/OverrideLocale.kt
@@ -0,0 +1,24 @@
+package net.pterodactylus.sone.test
+
+import org.junit.rules.ExternalResource
+import java.util.Locale
+
+/**
+ * JUnit [test rule][org.junit.rules.TestRule] that overrides the
+ * [JVM’s default locale][Locale.getDefault] for the duration of a test,
+ * restoring it to its previous value after the test.
+ */
+class OverrideLocale(private val locale: Locale) : ExternalResource() {
+
+	override fun before() {
+		previousLocale = Locale.getDefault()
+		Locale.setDefault(locale)
+	}
+
+	override fun after() {
+		Locale.setDefault(previousLocale)
+	}
+
+	private var previousLocale: Locale? = null
+
+}