7 day r value decimal place issue (EXPOSUREAPP-4751) #2216

* Fix issue of cutting off decimal place .00 in statistics cards

* Fix number formatting issue when decimal value is 3

* Fix number formatting issue for values below zero

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/statistics/util/StatisticsNumberValueFormatter.kt

@@ -22,7 +22,8 @@ fun formatStatisticalValue(
 
     return when (decimals) {
         in Int.MIN_VALUE..0 -> DecimalFormat("#,###", DecimalFormatSymbols(locale))
-        1 -> DecimalFormat("#,###.0", DecimalFormatSymbols(locale))
-        else -> DecimalFormat("#,###.##", DecimalFormatSymbols(locale))
+        1 -> DecimalFormat("#,##0.0", DecimalFormatSymbols(locale))
+        2 -> DecimalFormat("#,##0.00", DecimalFormatSymbols(locale))
+        else -> DecimalFormat("#,##0.000", DecimalFormatSymbols(locale))
     }.format(value)
 }

Corona-Warn-App/src/test/java/de/rki/coronawarnapp/statistics/util/StatisticsNumberValueFormatterTest.kt

@@ -56,6 +56,11 @@ internal class StatisticsNumberValueFormatterTest {
             Arguments.of(12.3456, 2, Locale.GERMANY, "12,35"),
 
             Arguments.of(1.0036, 1, Locale.GERMANY, "1,0"),
+            Arguments.of(1.0036, 2, Locale.GERMANY, "1,00"),
+            Arguments.of(1.0, 3, Locale.GERMANY, "1,000"),
+
+            Arguments.of(0.94, 1, Locale.GERMANY, "0,9"),
+            Arguments.of(0.95, 2, Locale.GERMANY, "0,95"),
 
             Arguments.of(12.3456, 1, Locale.UK, "12.3"),