diff --git a/test/amount-test.js b/test/amount-test.js
index 48ff2843..efdf7ca7 100644
--- a/test/amount-test.js
+++ b/test/amount-test.js
@@ -18,8 +18,22 @@ describe('Amount', function() {
   });
   describe('from_number', function() {
     it('Number 1', function() {
-      // TODO: ask for validation of this change when submitting the pull request
-      assert.strictEqual(Amount.from_number(1).to_text_full(), '1/XRP/rrrrrrrrrrrrrrrrrrrrBZbvji');
+      assert.strictEqual(Amount.from_number(1).to_text_full(), '1/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
+    });
+    it('Number 2', function() {
+      assert.strictEqual(Amount.from_number(2).to_text_full(), '2/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
+    });
+    it('Multiply 2 "1" with 3 "1", by product_human', function () {
+      assert.strictEqual(Amount.from_number(2).product_human(Amount.from_number(3)).to_text_full(), '6/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
+    });
+    it('Multiply 3 USD with 3 "1"', function () {
+      assert.strictEqual(Amount.from_json('3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_number(3)).to_text_full(), '9/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
+    });
+    it('Multiply -1 "1" with 3 USD', function () {
+      assert.strictEqual(Amount.from_number(-1).multiply(Amount.from_json('3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full(), '-3/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
+    });
+    it('Multiply -1 "1" with 3 USD, by product_human', function () {
+      assert.strictEqual(Amount.from_number(-1).product_human(Amount.from_json('3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full(), '-3/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
     });
   });
   describe('text_full_rewrite', function() {