Use BigDecimal for budget inside the Quota

- To allow budgets below $1/hour we change the internal representation of budget
  to a decimal number.  Some interfaces that assume integers are kept to keep the
  API stable.

- Created a nicer method .unlimited() instead of .empt() to better show semantics.

- Added some serialisation tests to make sure we support integers and decimals.

1 files changed, 41 insertions, 0 deletions

diff --git a/config-model-api/src/test/java/com/yahoo/config/model/api/QuotaTest.java b/config-model-api/src/test/java/com/yahoo/config/model/api/QuotaTest.java
new file mode 100644
index 00000000000..83d4ffbbe72
--- /dev/null
+++ b/config-model-api/src/test/java/com/yahoo/config/model/api/QuotaTest.java
@@ -0,0 +1,41 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.config.model.api;
+
+import com.yahoo.slime.SlimeUtils;
+import org.junit.Test;
+
+
+import java.math.BigDecimal;
+
+import static org.junit.Assert.assertEquals;
+
+public class QuotaTest {
+
+    @Test
+    public void test_serialization_with_integers() {
+        var json = "{\"budget\": 123}";
+        var slime = SlimeUtils.jsonToSlime(json);
+        var quota = Quota.fromSlime(slime.get());
+        assertEquals((Integer) 123, quota.budget().get());
+        assertEquals(123, quota.budgetAsDecimal().get().intValueExact());
+    }
+
+    @Test
+    public void test_serialization_with_floats() {
+        var json = "{\"budget\": 123.4}";
+        var slime = SlimeUtils.jsonToSlime(json);
+        var quota = Quota.fromSlime(slime.get());
+        assertEquals((Integer) 123, quota.budget().get());
+        assertEquals(123.4, quota.budgetAsDecimal().get().doubleValue(), 0.01);
+    }
+
+    @Test
+    public void test_serialization_with_string() {
+        var json = "{\"budget\": \"123.4\"}";
+        var slime = SlimeUtils.jsonToSlime(json);
+        var quota = Quota.fromSlime(slime.get());
+        assertEquals((Integer) 123, quota.budget().get());
+        assertEquals(new BigDecimal("123.4"), quota.budgetAsDecimal().get());
+    }
+
+}