chore: add unitToPlanck tests

w3ux · Oct 31, 2024 · 9e9c17a · 9e9c17a
1 parent 373f925
commit 9e9c17a
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Showing 2 changed files with 20 additions and 3 deletions.
diff --git a/library/utils/src/unit.ts b/library/utils/src/unit.ts
@@ -77,9 +77,16 @@ export const unitToPlanck = (
 
     // Process the fractional part if it exists
     if (fractionalPart) {
-      // Scale the fractional part by padding to the full number of decimal places
-      const paddedFractional = fractionalPart.padEnd(units, "0");
-      const fractionalValue = BigInt(paddedFractional);
+      let fractionalValue: bigint;
+
+      if (fractionalPart.length > units) {
+        // If fractional part exceeds units, truncate it
+        fractionalValue = BigInt(fractionalPart.slice(0, units));
+      } else {
+        // Otherwise, pad the fractional part to match units
+        fractionalValue = BigInt(fractionalPart.padEnd(units, "0"));
+      }
+
       bigIntValue += fractionalValue;
     }
 

diff --git a/library/utils/tests/unit.test.ts b/library/utils/tests/unit.test.ts
@@ -64,6 +64,16 @@ describe("unitToPlanck", () => {
     expect(result).toEqual(10000000n);
   });
 
+  test("Invalid when units are smaller than decimals - returns zero.", () => {
+    const result = fn.unitToPlanck("0.0001", 3);
+    expect(result).toEqual(0n);
+  });
+
+  test("Valid when unit value is decimals + 1.", () => {
+    const result = fn.unitToPlanck("0.0001", 4);
+    expect(result).toEqual(1n);
+  });
+
   test("should return valid planck value for a string input", () => {
     const result = fn.unitToPlanck("5", 6);
     expect(result).toEqual(5000000n);