[POS Orders] Hide lines with zero value

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/woopos/orders/WooPosOrdersViewModel.kt

@@ -625,10 +625,10 @@ class WooPosOrdersViewModel @Inject constructor(
 
         return OrderDetailsViewState.Computed.Details.TotalsBreakdown(
             products = formatPrice(order.productsTotal),
-            discount = order.discountTotal.takeIf { it != BigDecimal.ZERO }?.let { "-${formatPrice(it)}" },
+            discount = order.discountTotal.takeIf { !it.isZero() }?.let { "-${formatPrice(it)}" },
             discountCode = discountCode,
             taxes = formatPrice(order.totalTax),
-            shipping = order.shippingTotal.takeIf { it != BigDecimal.ZERO }?.let { formatPrice(it) },
+            shipping = order.shippingTotal.takeIf { !it.isZero() }?.let { formatPrice(it) },
             refunds = refundInfo.refundAmounts,
             netPayment = netPayment
         )
@@ -648,3 +648,5 @@ private fun Order.Status.localizedLabel(resourceProvider: ResourceProvider, loca
         Order.Status.Refunded -> resourceProvider.getString(R.string.woopos_orders_status_refunded)
     }
 }
+
+private fun BigDecimal.isZero() = this.compareTo(BigDecimal.ZERO) == 0

WooCommerce/src/main/res/values/strings.xml

@@ -3826,8 +3826,8 @@
     <string name="woopos_orders_details_totals_title">Totals</string>
     <string name="woopos_orders_details_qty_unit_price_format">%1$d x %2$s</string>
     <string name="woopos_orders_details_breakdown_products_label">Products</string>
-    <string name="woopos_orders_details_breakdown_discount_label">Discount</string>
-    <string name="woopos_orders_details_breakdown_discount_with_code_label">Discount (%1$s)</string>
+    <string name="woopos_orders_details_breakdown_discount_label">Discount total</string>
+    <string name="woopos_orders_details_breakdown_discount_with_code_label">Discount total (%1$s)</string>
     <string name="woopos_orders_details_breakdown_taxes_label">Taxes</string>
     <string name="woopos_orders_details_breakdown_shipping_label">Shipping</string>
     <string name="woopos_orders_details_total_label">Total</string>

WooCommerce/src/test/kotlin/com/woocommerce/android/ui/woopos/orders/WooPosOrdersViewModelTest.kt

@@ -844,4 +844,57 @@ class WooPosOrdersViewModelTest {
         // THEN
         verify(ordersAnalyticsTracker).trackOrdersListSearchResultsFetched(any())
     }
+
+    @Test
+    fun `given order with zero discount and zero shipping, when mapped, then discount and shipping are absent`() = runTest {
+        // GIVEN
+        val base = order(1)
+        val withZeros = base.copy(
+            discountTotal = BigDecimal("0.00"),
+            shippingTotal = BigDecimal("0.00")
+        )
+
+        // WHEN
+        whenever(dataSource.loadOrders()).thenReturn(
+            flow { emit(LoadOrdersResult.SuccessRemote(ordersMap(withZeros))) }
+        )
+
+        viewModel = createViewModel()
+        advanceUntilIdle()
+
+        // THEN
+        val content = viewModel.state.value as WooPosOrdersState.Content
+        val breakdown = content.selectedDetails.breakdown
+        assertThat(breakdown.discount).isNull()
+        assertThat(breakdown.shipping).isNull()
+    }
+
+    @Test
+    fun `given order with non-zero discount and shipping, when mapped, then discount and shipping are formatted`() = runTest {
+        // GIVEN
+        val base = order(2)
+        val withValues = base.copy(
+            discountTotal = BigDecimal("3.50"),
+            shippingTotal = BigDecimal("4.00")
+        )
+
+        // WHEN
+        runBlocking {
+            whenever(formatPrice.invoke(BigDecimal("3.50"))).thenReturn("$3.50")
+            whenever(formatPrice.invoke(BigDecimal("4.00"))).thenReturn("$4.00")
+        }
+
+        whenever(dataSource.loadOrders()).thenReturn(
+            flow { emit(LoadOrdersResult.SuccessRemote(ordersMap(withValues))) }
+        )
+
+        viewModel = createViewModel()
+        advanceUntilIdle()
+
+        // THEN
+        val content = viewModel.state.value as WooPosOrdersState.Content
+        val breakdown = content.selectedDetails.breakdown
+        assertThat(breakdown.discount).isEqualTo("-$3.50")
+        assertThat(breakdown.shipping).isEqualTo("$4.00")
+    }
 }