table_driven_doughnuts_box_individual__subtests.go

package doughnuts_box

import (
    "testing"

    "github.com/stretchr/testify/assert"
    "github.com/stretchr/testify/require"
)

func TestPackDoughnutsBoxSubtests(t *testing.T) {
    t.Run("It fills the box with tasty doughnuts", func(t *testing.T) {
        // Arrange
        items := []string{"Sri Lankan Cinnamon Sugar", "Matcha Tea", "Home Made Raspberry Jam", "Lime & Coconut (ve)"}
        box := newDoughnutsBox(4)

        // Act
        numOfDoughnutsInTheBox, err := box.pack(items)

        // Assert
        require.NoError(t, err)
        assert.Equal(t, numOfDoughnutsInTheBox, 4)
    })
    t.Run("It fails to fill the box with too many doughnuts", func(t *testing.T) {
        // Arrange
        items := []string{"Sri Lankan Cinnamon Sugar", "Matcha Tea", "Home Made Raspberry Jam", "Lime & Coconut (ve)", "Lime & Coconut (ve)"}
        box := newDoughnutsBox(4)

        // Act
        numOfDoughnutsInTheBox, err := box.pack(items)

        // Assert
        require.Error(t, err)
        assert.Equal(t, "failed to put 5 doughnuts in the box, it's only has 4 doughnuts capacity", err.Error())
        assert.Equal(t, 0, numOfDoughnutsInTheBox)
    })
    t.Run("It fails to put a giant chocolate cookie into the box", func(t *testing.T) {
        // Arrange
        items := []string{"Sri Lankan Cinnamon Sugar", "Giant Chocolate Cookie"}
        box := newDoughnutsBox(4)

        // Act
        numOfDoughnutsInTheBox, err := box.pack(items)

        // Assert
        require.Error(t, err)
        assert.Equal(t, "the following items cannot be placed into the box: [Giant Chocolate Cookie]", err.Error())
        assert.Equal(t, 1, numOfDoughnutsInTheBox)
    })
}