always run tests with locale en_US, no matter of system settings

src/test/java/net/hostsharing/test/LocaleUnitTest.java

@@ -0,0 +1,17 @@
+package net.hostsharing.test;
+
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+import java.util.Locale;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class LocaleUnitTest {
+
+    @Test
+    void testsAreUsingEnUsUtf8Locale() {
+        assertThat(Locale.getDefault()).isEqualTo(new Locale("en", "US"));
+        assertThat(new BigDecimal("64.00").toString()).isEqualTo("64.00");
+    }
+}