[Core] Fix locale in DefaultSummaryPrinter

The `Stats` would use `Locale.getDefault()` resulting in different test
output by the `DefaultSummaryPrinter` when used in a locale with a
different decimal separator (e.g: France). Fixing the locale to US in
the test should avoid this problem.

Closes: #2010

Author: mpkorstanje

core/src/main/java/io/cucumber/core/plugin/DefaultSummaryPrinter.java

@@ -11,21 +11,22 @@
 import java.io.PrintStream;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Set;
 
 public final class DefaultSummaryPrinter implements SummaryPrinter, ColorAware, ConcurrentEventListener {
 
     private final Set<String> snippets = new LinkedHashSet<>();
-    private final Stats stats = new Stats();
-
+    private final Stats stats;
     private final PrintStream out;
 
     public DefaultSummaryPrinter() {
-        this(System.out);
+        this(System.out, Locale.getDefault());
     }
 
-    DefaultSummaryPrinter(OutputStream out) {
+    DefaultSummaryPrinter(OutputStream out, Locale locale) {
         this.out = new PrintStream(out);
+        this.stats = new Stats(locale);
     }
 
     @Override

core/src/main/java/io/cucumber/core/plugin/Stats.java

@@ -40,10 +40,6 @@ class Stats implements ConcurrentEventListener, ColorAware {
     private Duration totalDuration = Duration.ZERO;
     private Formats formats = new AnsiFormats();
 
-    Stats() {
-        this(Locale.getDefault());
-    }
-
     Stats(Locale locale) {
         this.locale = locale;
     }

core/src/test/java/io/cucumber/core/plugin/DefaultSummaryPrinterTest.java

@@ -11,6 +11,7 @@
 import java.net.URI;
 import java.time.Clock;
 import java.time.ZoneId;
+import java.util.Locale;
 import java.util.UUID;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
@@ -22,7 +23,7 @@
 class DefaultSummaryPrinterTest {
 
     private final ByteArrayOutputStream out = new ByteArrayOutputStream();
-    private final DefaultSummaryPrinter summaryPrinter = new DefaultSummaryPrinter(out);
+    private final DefaultSummaryPrinter summaryPrinter = new DefaultSummaryPrinter(out, Locale.US);
     private final EventBus bus = new TimeServiceEventBus(
         Clock.fixed(ofEpochSecond(0), ZoneId.of("UTC")),
         UUID::randomUUID);