In class code for recycler

37-what-to-test/recycler-js/recycler.test.js

@@ -21,10 +21,65 @@ test('getRandomJunk returns a string', () => {
 });
 
 test('getRandomJunk returns an array of number length when given a number', () => {
-  // fill this in
+  //arrange
+  let num = 3;
+  //act
+  let junk = getRandomJunk(num);
+  //assert
+  expect(junk.length).toEqual(3);
+});
+
+test('getRandomJunk returns an empty array when given a string as an argument', () => {
+  let junk = getRandomJunk("foo");
+  expect(junk).toEqual([]);
 });
 
 test('isCompostable returns true if item in food array', () => {
   // expect(isCompostable('Moldy Bread')).toEqual(true);
   expect(isCompostable('Moldy Bread')).toBeTruthy();
 });
+
+test('isCompostable returns false when item is not in food array', () => {
+  expect(isCompostable('Something Else')).toBeFalsy();
+})
+
+test('isRecyclable returns true if item in plastic array', () => {
+  expect(isRecyclable('Soda Bottle')).toBeTruthy();
+});
+
+test('isRecyclable returns true if item in paper array', () => {
+  expect(isRecyclable('Newspaper')).toBeTruthy();
+});
+
+test('isRecyclable returns true if item in metal array', () => {
+  expect(isRecyclable('Soda Can')).toBeTruthy();
+});
+
+test('isRecyclable returns true if item in glass array', () => {
+  expect(isRecyclable('Glass Bottle')).toBeTruthy();
+});
+
+test('isRecyclable returns false if item is something else', () => {
+  expect(isRecyclable('Black Plastic')).toBeFalsy();
+});
+
+test('emptyMaterial returns starting material values', () => {
+  //arrange
+  //act
+  let material = emptyMaterial();
+  //assert
+  expect(material).toEqual({
+    garbage: 0, compost: 0, metal: 0, glass: 0, paper: 0, plastic: 0
+  });
+});
+
+test('emptyMaterial updates material variable to initial value', () => {
+  //arrange
+  toss(["Old Shoes", "Black Plastic"]);
+  //act
+  emptyMaterial();
+  //assert
+  expect(getMaterial()).toEqual({
+    garbage: 0, compost: 0, metal: 0, glass: 0, paper: 0, plastic: 0
+  });
+});

37-what-to-test/recycler-js/rules.md

@@ -0,0 +1,3 @@
+- Test the public interface (ie. functions being exported)
+- Test for return values and updates to state (ie. side effects, or updates to variables)
+- Test all possible outcomes (ie. if statements)