fix formatting tests

src/__tests__/format.ts

+import BigInteger from 'bignumber.js'
+
 import { FlexibleFormat, FormatSignificantOptions, FormatFixedOptions } from '../types'
-import { formatSignificant, formatFixed } from '../format'
-import { FIXED_UNDERFLOW_BEHAVIOR } from '../constants'
+import { formatSignificant, formatSignificantDecimals, formatFixed, formatFixedDecimals } from '../format'
+import { FIXED_UNDERFLOW_BEHAVIOR, ROUNDING_MODE } from '../constants'
 
 function constructFormatSignificantOptions(
   significantDigits: number,
+  roundingMode: BigInteger.RoundingMode = ROUNDING_MODE,
   forceIntegerSignificance: boolean = false,
   format: FlexibleFormat = false
 ): FormatSignificantOptions {
   return {
     significantDigits,
+    roundingMode,
     forceIntegerSignificance,
     format
   }
@@ -16,15 +20,17 @@ function constructFormatSignificantOptions(
 
 function constructFormatFixedOptions(
   decimalPlaces: number,
+  roundingMode: BigInteger.RoundingMode = ROUNDING_MODE,
   dropTrailingZeros: boolean = true,
-  format: FlexibleFormat = false,
-  underflowBehavior: FIXED_UNDERFLOW_BEHAVIOR = FIXED_UNDERFLOW_BEHAVIOR.ONE_DIGIT
+  underflowBehavior: FIXED_UNDERFLOW_BEHAVIOR = FIXED_UNDERFLOW_BEHAVIOR.ONE_DIGIT,
+  format: FlexibleFormat = false
 ): FormatFixedOptions {
   return {
     decimalPlaces,
+    roundingMode,
     dropTrailingZeros,
-    format,
-    underflowBehavior
+    underflowBehavior,
+    format
   }
 }
 
@@ -33,6 +39,11 @@ describe('formatSignificant', (): void => {
     const formatted = formatSignificant('1.234', constructFormatSignificantOptions(2))
     expect(formatted).toBe('1.2')
   })
+
+  test('decimal', (): void => {
+    const formatted = formatSignificantDecimals('1234', 3, constructFormatSignificantOptions(2))
+    expect(formatted).toBe('1.2')
+  })
 })
 
 describe('formatFixed', (): void => {
@@ -40,4 +51,9 @@ describe('formatFixed', (): void => {
     const formatted = formatFixed('1.234', constructFormatFixedOptions(1))
     expect(formatted).toBe('1.2')
   })
+
+  test('regular', (): void => {
+    const formatted = formatFixedDecimals('1234', 3, constructFormatFixedOptions(1))
+    expect(formatted).toBe('1.2')
+  })
 })