add fault input tests

src/mathString.test.ts

@@ -1,3 +1,4 @@
+import { checkInput } from './checkPhrase';
 import solve from './mathString';
 import {
   selectMultiplicationPhrase,
@@ -21,7 +22,12 @@ const input: string[] = [
   '-1+3*((4+4*(3+4))+(3*(-1)*-2)/4)+3-5',
   '1*2/4*6+4*3'
 ];
-
+const faultInput = [
+  '1**1*1***2',
+  '1//3/3/////4',
+  '1....2+1.2+1...2',
+  '1+(2+2+2+3+(3)'
+];
 describe('test Regex for inputs', () => {
   it('select numbers', () => {
     expect(selectNumbers(input[0])).toEqual(['1', '+11', '+9', '-11e23']);
@@ -57,3 +63,25 @@ describe('solve phrases math', () => {
     expect(solve(input[4])).toBe('2');
   });
 });
+describe('detect fault input', () => {
+  it('throw error if use more than one * operator in one place', () => {
+    expect(() => {
+      checkInput(faultInput[0]);
+    }).toThrow();
+  });
+  it('throw error if use more than one / operator in one place', () => {
+    expect(() => {
+      checkInput(faultInput[1]);
+    }).toThrow();
+  });
+  it('throw error if use more than one . in one place', () => {
+    expect(() => {
+      checkInput(faultInput[2]);
+    }).toThrow();
+  });
+  it('throw error if use not equal parenthesses', () => {
+    expect(() => {
+      checkInput(faultInput[3]);
+    }).toThrow();
+  });
+});

src/solveModules.ts

@@ -87,8 +87,6 @@ export const solveSummationOrSubtraction = (phrase: string) => {
     ''
   );
   const result =
-    mathOperator && mathOperator == mathSigns.subtraction
-      ? +num1 - +num2
-      : +num1 + +num2;
+    mathOperator == mathSigns.subtraction ? +num1 - +num2 : +num1 + +num2;
   return result >= 0 ? `+${result.toString()}` : result.toString();
 };