fix(numberFilter): numbers rounding to zero shouldn't be negative

Closes #10278

Author: pkozlowski-opensource

src/ng/filter/filters.js

@@ -150,7 +150,6 @@ function formatNumber(number, pattern, groupSep, decimalSep, fractionSize) {
   if (numStr.indexOf('e') !== -1) {
     var match = numStr.match(/([\d\.]+)e(-?)(\d+)/);
     if (match && match[2] == '-' && match[3] > fractionSize + 1) {
-      numStr = '0';
       number = 0;
     } else {
       formatedText = numStr;
@@ -171,10 +170,6 @@ function formatNumber(number, pattern, groupSep, decimalSep, fractionSize) {
     // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
     number = +(Math.round(+(number.toString() + 'e' + fractionSize)).toString() + 'e' + -fractionSize);
 
-    if (number === 0) {
-      isNegative = false;
-    }
-
     var fraction = ('' + number).split(DECIMAL_SEP);
     var whole = fraction[0];
     fraction = fraction[1] || '';
@@ -207,12 +202,16 @@ function formatNumber(number, pattern, groupSep, decimalSep, fractionSize) {
 
     if (fractionSize && fractionSize !== "0") formatedText += decimalSep + fraction.substr(0, fractionSize);
   } else {
-
-    if (fractionSize > 0 && number > -1 && number < 1) {
+    if (fractionSize > 0 && number < 1) {
       formatedText = number.toFixed(fractionSize);
+      number = parseFloat(formatedText);
     }
   }
 
+  if (number === 0) {
+    isNegative = false;
+  }
+
   parts.push(isNegative ? pattern.negPre : pattern.posPre,
              formatedText,
              isNegative ? pattern.negSuf : pattern.posSuf);

test/ng/filter/filtersSpec.js

@@ -85,8 +85,10 @@ describe('filters', function() {
     });
 
     it('should format numbers that round to zero as nonnegative', function() {
-      var num = formatNumber(-0.01, pattern, ',', '.', 1);
-      expect(num).toBe('0.0');
+      expect(formatNumber(-0.01, pattern, ',', '.', 1)).toBe('0.0');
+      expect(formatNumber(-1e-10, pattern, ',', '.', 1)).toBe('0.0');
+      expect(formatNumber(-0.0001, pattern, ',', '.', 3)).toBe('0.000');
+      expect(formatNumber(-0.0000001, pattern, ',', '.', 6)).toBe('0.000000');
     });
   });
 
@@ -195,10 +197,12 @@ describe('filters', function() {
       expect(number(1e-50, 0)).toEqual('0');
       expect(number(1e-6, 6)).toEqual('0.000001');
       expect(number(1e-7, 6)).toEqual('0.000000');
+      expect(number(9e-7, 6)).toEqual('0.000001');
 
       expect(number(-1e-50, 0)).toEqual('0');
       expect(number(-1e-6, 6)).toEqual('-0.000001');
-      expect(number(-1e-7, 6)).toEqual('-0.000000');
+      expect(number(-1e-7, 6)).toEqual('0.000000');
+      expect(number(-1e-8, 9)).toEqual('-0.000000010');
     });
   });