diff --git a/src/calculator.spec.ts b/src/calculator.spec.ts
index f8dede2..c77a9ae 100644
--- a/src/calculator.spec.ts
+++ b/src/calculator.spec.ts
@@ -24,14 +24,14 @@ describe('Calulator: no starting value', () => {
     expect(calc.total).toEqual(13);
   })
 
-  // it('can perform subtraction', () => {
-  //   calc.minus(1)
-  //   expect(calc.total).toEqual(-1);
-  //   calc.minus(2)
-  //   expect(calc.total).toEqual(-3);
-  //   calc.minus(3)
-  //   expect(calc.total).toEqual(-6);
-  // })
+  it('can perform subtraction', () => {
+    calc.minus(1)
+    expect(calc.total).toEqual(-1);
+    calc.minus(2)
+    expect(calc.total).toEqual(-3);
+    calc.minus(3)
+    expect(calc.total).toEqual(-6);
+  })
 });
 
 describe('Calulator: starting value 99', () => {
diff --git a/src/calculator.ts b/src/calculator.ts
index 420213b..425be5b 100644
--- a/src/calculator.ts
+++ b/src/calculator.ts
@@ -1,9 +1,16 @@
+function test(foo) {
+  if(foo === 'bar') return true
+  return false
+}
+
 export default class Calculator {
   private value = 0;
   private calcMode = ""
   constructor(scientificMode = false, value = 0) {
     this.value = value
 
+    test('biz')
+
     if(scientificMode) {
       this.calcMode = "science!"
     } else if(scientificMode && this.value > 0) {