1 files changed, 65 insertions, 0 deletions
diff --git a/packages/instant/test/util/maybe_big_number.test.ts b/packages/instant/test/util/maybe_big_number.test.ts
new file mode 100644
index 000000000..508e8aaf0
--- /dev/null
+++ b/packages/instant/test/util/maybe_big_number.test.ts
@@ -0,0 +1,65 @@
+import { BigNumber } from '@0x/utils';
+
+import { maybeBigNumberUtil } from '../../src/util/maybe_big_number';
+
+const BIG_NUMBER_1 = new BigNumber('10.1');
+const BIG_NUMBER_2 = new BigNumber('10.1');
+const BIG_NUMBER_3 = new BigNumber('11.1');
+
+describe('maybeBigNumberUtil', () => {
+    describe('stringToMaybeBigNumber', () => {
+        it('should return undefined if stringValue is NaN', () => {
+            expect(maybeBigNumberUtil.stringToMaybeBigNumber('NaN')).toEqual(undefined);
+        });
+        it('should return bignumber constructed with stringValue', () => {
+            const bn = maybeBigNumberUtil.stringToMaybeBigNumber('10.1');
+            if (!!bn) {
+                expect(bn.toString()).toEqual('10.1');
+            }
+        });
+        it('should return undefined if stringValue is not valid (i.e not numeric)', () => {
+            expect(maybeBigNumberUtil.stringToMaybeBigNumber('test')).toEqual(undefined);
+        });
+    });
+
+    describe('areMaybeBigNumbersEqual', () => {
+        it('should return true if val1 and val2 are equivalent BigNumber values', () => {
+            expect(maybeBigNumberUtil.areMaybeBigNumbersEqual(BIG_NUMBER_1, BIG_NUMBER_2)).toEqual(true);
+        });
+        it('should return true if val1 and val2 are both undefined', () => {
+            expect(maybeBigNumberUtil.areMaybeBigNumbersEqual(undefined, undefined)).toEqual(true);
+        });
+        it('should return false if either one val1 or val2 is undefined', () => {
+            expect(maybeBigNumberUtil.areMaybeBigNumbersEqual(BIG_NUMBER_1, undefined)).toEqual(false);
+        });
+        it('should return false if val1 and val2 are equivalent values BigNumber', () => {
+            expect(maybeBigNumberUtil.areMaybeBigNumbersEqual(BIG_NUMBER_1, BIG_NUMBER_3)).toEqual(false);
+        });
+    });
+
+    // this doesn't test coercing a pre v8.0.0 version of big number to desired version
+    describe('toMaybeBigNumber', () => {
+        it('should return BigNumber (>=v8.0.0) constructed with value if type is string', () => {
+            const bn = maybeBigNumberUtil.toMaybeBigNumber('10.1');
+            if (!!bn) {
+                expect(bn.toString()).toEqual('10.1');
+            }
+        });
+        it('should return undefined if value is NaN', () => {
+            expect(maybeBigNumberUtil.toMaybeBigNumber('NaN')).toEqual(undefined);
+        });
+        it('should return undefined if value as string is not valid (i.e not numeric)', () => {
+            expect(maybeBigNumberUtil.toMaybeBigNumber('test')).toEqual(undefined);
+        });
+        it('should return undefined if value as string is not valid (i.e not numeric)', () => {
+            expect(maybeBigNumberUtil.toMaybeBigNumber('test')).toEqual(undefined);
+        });
+        it('should return BigNumber (>=v8.0.0) when passed a value as BigNumber (>=v8.0.0)', () => {
+            const bn = maybeBigNumberUtil.toMaybeBigNumber(BIG_NUMBER_1);
+            expect(BigNumber.isBigNumber(bn)).toEqual(true);
+        });
+        it('should return undefined if value is not BigNumber or string', () => {
+            expect(maybeBigNumberUtil.toMaybeBigNumber(true)).toEqual(undefined);
+        });
+    });
+});