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package main
import (
"io"
"os"
"testing"
"github.com/stretchr/testify/require"
)
func Test_NewImage(t *testing.T) {
requestedWidth := 50
testFile := "../../testdata/image.png"
r, err := os.Open(testFile)
require.NoError(t, err)
badTestFile := "../../testdata/audio.mp3"
br, err := os.Open(badTestFile)
require.NoError(t, err)
type args struct {
requestedWidth int
r io.Reader
}
tests := []struct {
name string
args args
wantW string
wantErrStr string
}{
{
name: "Bad requestedWidth",
args: args{requestedWidth: -1},
wantErrStr: "requestedWidth needs to be > 0",
},
{
name: "Bad r",
args: args{requestedWidth: requestedWidth, r: br},
wantErrStr: "decode: image: unknown format",
},
{
name: "Good",
args: args{requestedWidth: requestedWidth, r: r},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
img, err := NewImage(tt.args.requestedWidth, tt.args.r)
if tt.wantErrStr != "" {
require.ErrorContains(t, err, tt.wantErrStr)
} else {
require.Equal(t, requestedWidth, img.RequestedWidth)
require.NotNil(t, img.Source)
}
})
}
}
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