[taler-wallet-kotlin] branch master updated: Fix Amount multiplication with zero and add more multiplication tests

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torsten-grote pushed a commit to branch master
in repository wallet-kotlin.

The following commit(s) were added to refs/heads/master by this push:
     new 9befa8d  Fix Amount multiplication with zero and add more 
multiplication tests
9befa8d is described below

commit 9befa8db8317758ad9e5dad5e7698efff76f1a71
Author: Torsten Grote <t@grobox.de>
AuthorDate: Thu Jul 16 10:18:19 2020 -0300

    Fix Amount multiplication with zero and add more multiplication tests
---
 src/commonMain/kotlin/net/taler/wallet/kotlin/Amount.kt     | 2 ++
 src/commonTest/kotlin/net/taler/wallet/kotlin/AmountTest.kt | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/src/commonMain/kotlin/net/taler/wallet/kotlin/Amount.kt 
b/src/commonMain/kotlin/net/taler/wallet/kotlin/Amount.kt
index 87c147d..2d39bb3 100644
--- a/src/commonMain/kotlin/net/taler/wallet/kotlin/Amount.kt
+++ b/src/commonMain/kotlin/net/taler/wallet/kotlin/Amount.kt
@@ -151,6 +151,8 @@ data class Amount(
     }
 
     operator fun times(factor: Int): Amount {
+        // TODO consider replacing with a faster implementation
+        if (factor == 0) return zero(currency)
         var result = this
         for (i in 1 until factor) result += this
         return result
diff --git a/src/commonTest/kotlin/net/taler/wallet/kotlin/AmountTest.kt 
b/src/commonTest/kotlin/net/taler/wallet/kotlin/AmountTest.kt
index 578874d..08ee618 100644
--- a/src/commonTest/kotlin/net/taler/wallet/kotlin/AmountTest.kt
+++ b/src/commonTest/kotlin/net/taler/wallet/kotlin/AmountTest.kt
@@ -152,6 +152,12 @@ class AmountTest {
             Amount.fromJSONString("EUR:4.5"),
             Amount.fromJSONString("EUR:1.5") * 3
         )
+        assertEquals(Amount.fromJSONString("EUR:0"), 
Amount.fromJSONString("EUR:1.11") * 0)
+        assertEquals(Amount.fromJSONString("EUR:1.11"), 
Amount.fromJSONString("EUR:1.11") * 1)
+        assertEquals(Amount.fromJSONString("EUR:2.22"), 
Amount.fromJSONString("EUR:1.11") * 2)
+        assertEquals(Amount.fromJSONString("EUR:3.33"), 
Amount.fromJSONString("EUR:1.11") * 3)
+        assertEquals(Amount.fromJSONString("EUR:4.44"), 
Amount.fromJSONString("EUR:1.11") * 4)
+        assertEquals(Amount.fromJSONString("EUR:5.55"), 
Amount.fromJSONString("EUR:1.11") * 5)
         assertEquals(
             Amount.fromJSONString("EUR:1500000000.00000003"),
             Amount.fromJSONString("EUR:500000000.00000001") * 3

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