add more tests for checking preproc. type

Author: tompascall

__tests__/index.spec.js

@@ -126,9 +126,9 @@ describe('js-to-styles-vars-loader', () => {
             const [ moduleData, stylesContent ] = operator.divideContent(content);
             const modulePath = operator.getModulePath(moduleData);
             const varData = operator.getVarData(modulePath, context);
-            const vars = operator.transformToStyleVars(varData);
+            const vars = operator.transformToStyleVars({ type: 'less', varData });
 
-            expect(operator.mergeVarsToContent(content, context)).toEqual(vars + stylesContent);
+            expect(operator.mergeVarsToContent(content, context, 'less')).toEqual(vars + stylesContent);
         });
 
         it('gives back content as is if there is no requre', () => {
@@ -176,5 +176,13 @@ describe('js-to-styles-vars-loader', () => {
             operator.transformToStyleVars({ type: 'less', varData: {} });
             expect(operator.transformToLessVars).toHaveBeenCalled();
         });
+
+        it('throws error is type is unknown', () => {
+            const caller = () => {
+                operator.transformToStyleVars({ type: 'unknown' });
+            };
+
+            expect(caller).toThrow();
+        });
     });
 });

index.js

@@ -63,6 +63,8 @@ const operator = {
                 return this.transformToSassVars(varData);
             case 'less':
                 return this.transformToLessVars(varData);
+            default:
+                throw Error(`Unknown preprocessor type: ${type}`);
 
         }
     },