False price formatting (#113)

False price formatting

piwik-sdk/src/main/java/org/piwik/sdk/tools/CurrencyFormatter.java

@@ -9,13 +9,15 @@
 
 import android.support.annotation.Nullable;
 
-import java.text.DecimalFormat;
+import java.text.NumberFormat;
+import java.util.Locale;
 
 public class CurrencyFormatter {
     @Nullable
     public static String priceString(@Nullable Integer cents) {
         if (cents == null) return null;
-        DecimalFormat form = new DecimalFormat("0.00");
-        return form.format(cents / 100.);
+        NumberFormat numberFormat = NumberFormat.getNumberInstance(Locale.US);
+        numberFormat.setMinimumFractionDigits(2);
+        return numberFormat.format(cents / 100.);
     }
 }

piwik-sdk/src/test/java/org/piwik/sdk/tools/CurrencyFormatterTest.java

@@ -0,0 +1,28 @@
+package org.piwik.sdk.tools;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.piwik.sdk.testhelper.FullEnvTestRunner;
+import org.robolectric.annotation.Config;
+
+import static org.junit.Assert.assertEquals;
+
+@Config(emulateSdk = 18, manifest = Config.NONE)
+@RunWith(FullEnvTestRunner.class)
+public class CurrencyFormatterTest {
+
+    @Test
+    public void testCurrencyFormat() throws Exception {
+        String currency = CurrencyFormatter.priceString(1000);
+        assertEquals("10.00", currency);
+
+        currency = CurrencyFormatter.priceString(3950);
+        assertEquals("39.50", currency);
+
+        currency = CurrencyFormatter.priceString(1);
+        assertEquals("0.01", currency);
+
+        currency = CurrencyFormatter.priceString(25034);
+        assertEquals("250.34", currency);
+    }
+}