1 files changed, 38 insertions, 0 deletions
diff --git a/lib/wallet/types-test.ts b/lib/wallet/types-test.ts
new file mode 100644
index 000000000..3ebb1a5db
--- /dev/null
+++ b/lib/wallet/types-test.ts
@@ -0,0 +1,38 @@
+import {test, TestLib} from "testlib/talertest";
+import {Amounts} from "./types";
+import * as types from "./types";
+
+let amt = (value: number, fraction: number, currency: string): types.AmountJson => ({value, fraction, currency});
+
+test("amount addition (simple)", (t: TestLib) => {
+  let a1 = amt(1,0,"EUR");
+  let a2 = amt(1,0,"EUR");
+  let a3 = amt(2,0,"EUR");
+  t.assert(0 == types.Amounts.cmp(Amounts.add(a1, a2).amount, a3));
+  t.pass();
+});
+
+test("amount addition (saturation)", (t: TestLib) => {
+  let a1 = amt(1,0,"EUR");
+  let res = Amounts.add(Amounts.getMaxAmount("EUR"), a1);
+  t.assert(res.saturated);
+  t.pass();
+});
+
+test("amount subtraction (simple)", (t: TestLib) => {
+  let a1 = amt(2,5,"EUR");
+  let a2 = amt(1,0,"EUR");
+  let a3 = amt(1,5,"EUR");
+  t.assert(0 == types.Amounts.cmp(Amounts.sub(a1, a2).amount, a3));
+  t.pass();
+});
+
+test("amount subtraction (saturation)", (t: TestLib) => {
+  let a1 = amt(0,0,"EUR");
+  let a2 = amt(1,0,"EUR");
+  let res = Amounts.sub(a1, a2);
+  t.assert(res.saturated);
+  res = Amounts.sub(a1, a1);
+  t.assert(!res.saturated);
+  t.pass();
+});