improve coverage

Author: make-github-pseudonymous-again

test/src/integer/parse_stringify_negative_base_10.js

@@ -0,0 +1,25 @@
+import test from 'ava' ;
+
+import { parse , stringify } from '../../../src' ;
+
+const numbers = [
+	'0' ,
+	'1' ,
+	'209802830232092830823' ,
+	'8237893478979874398743987489372039820947309874890209382098407' ,
+	'9023803289238028329081829018039820380283092380298039283092803928039820' ,
+	'-1' ,
+	'-209802830232092830823' ,
+	'-8237893478979874398743987489372039820947309874890209382098407' ,
+	'-9023803289238028329081829018039820380283092380298039283092803928039820' ,
+] ;
+
+function macro ( t , number ) {
+	const parsed = parse(number, 10, -1) ;
+	const unparsed = stringify(parsed.opposite()) ;
+	t.is( unparsed , number ) ;
+}
+
+macro.title = ( _ , number ) => `stringify(parse(${number})) == ${number}` ;
+
+for ( const number of numbers ) test( macro , number ) ;