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nodemanager_test.go
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package flattenhtml_test
import (
"bytes"
"context"
"strings"
"testing"
"github.com/seinshah/flattenhtml"
"github.com/stretchr/testify/require"
"golang.org/x/net/html"
)
func TestNewNodeManager(t *testing.T) {
t.Parallel()
sampleHTML := "<html><head></head><body></body></html>"
testCases := []struct {
name string
result func() (*flattenhtml.NodeManager, error)
wantErr bool
}{
{
name: "new node manager from html.Node",
result: func() (*flattenhtml.NodeManager, error) {
sampleTree, err := html.Parse(strings.NewReader(sampleHTML))
if err != nil {
return nil, err
}
return flattenhtml.NewNodeManager(sampleTree), nil
},
},
{
name: "new node manager from reader",
result: func() (*flattenhtml.NodeManager, error) {
return flattenhtml.NewNodeManagerFromReader(strings.NewReader(sampleHTML))
},
},
{
name: "new node manager from url",
result: func() (*flattenhtml.NodeManager, error) {
return flattenhtml.NewNodeManagerFromURL(context.Background(), "https://google.com")
},
},
{
name: "non-existing url",
result: func() (*flattenhtml.NodeManager, error) {
return flattenhtml.NewNodeManagerFromURL(context.Background(), "https://test.non-existing")
},
wantErr: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
resp, err := tc.result()
if tc.wantErr {
require.Error(t, err)
return
}
require.NoError(t, err)
require.NotNil(t, resp)
})
}
}
func TestNodeManager_Parse(t *testing.T) {
t.Parallel()
sampleHTML := "<html><head></head><body></body></html>"
testCases := []struct {
name string
flattener []flattenhtml.Flattener
// expectedCallbacks is the expected number of times the callback
// method of each flattener is called. exclude html tag from the count.
expectedCallbacks []int
wantErr bool
errType error
}{
{
name: "parse with no flattener",
flattener: nil,
wantErr: true,
errType: flattenhtml.ErrNoFlattener,
},
{
name: "parse with one flattener that trigger error",
flattener: []flattenhtml.Flattener{&sampleFlattener{withErr: true}},
wantErr: true,
errType: errSample,
},
{
name: "parse with one flattener",
flattener: []flattenhtml.Flattener{&sampleFlattener{}},
expectedCallbacks: []int{4},
},
{
name: "parse with two flatteners and one of them trigger error",
flattener: []flattenhtml.Flattener{&sampleFlattener{}, &sampleFlattener{withErr: true}},
wantErr: true,
errType: errSample,
},
{
name: "parse with two flatteners",
flattener: []flattenhtml.Flattener{&sampleFlattener{}, &sampleFlattener{}},
expectedCallbacks: []int{4, 4},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
resp, err := flattenhtml.NewNodeManagerFromReader(strings.NewReader(sampleHTML))
require.NoError(t, err)
mc, err := resp.Parse(tc.flattener...)
if tc.wantErr {
require.Error(t, err)
if tc.errType != nil {
require.IsType(t, tc.errType, err)
}
return
}
require.NoError(t, err)
require.NotNil(t, mc)
for index, f := range tc.flattener {
require.Equal(t, tc.expectedCallbacks[index], f.Len())
}
})
}
}
func TestNodeManager_Render(t *testing.T) {
t.Parallel()
sampleHTML := "<html><head></head><body></body></html>"
testCases := []struct {
name string
expected string
wantErr bool
errType error
}{
{
name: "successful render",
expected: sampleHTML,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
resp, err := flattenhtml.NewNodeManagerFromReader(strings.NewReader(sampleHTML))
require.NoError(t, err)
mc, err := resp.Parse(&sampleFlattener{})
require.NoError(t, err)
require.NotNil(t, mc)
rendered := bytes.Buffer{}
err = resp.Render(&rendered)
if tc.wantErr {
require.Error(t, err)
if tc.errType != nil {
require.IsType(t, tc.errType, err)
}
return
}
require.NoError(t, err)
require.Equal(t, tc.expected, rendered.String())
})
}
}