github.com/bazelbuild/rules_webtesting@v0.2.0/go/screenshotter/screenshotter_test.go (about)

     1  // Copyright 2017 Google Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package screenshotter
    16  
    17  import (
    18  	"fmt"
    19  	"image/png"
    20  	"io/ioutil"
    21  	"log"
    22  	"net/http"
    23  	"os"
    24  	"path/filepath"
    25  	"testing"
    26  
    27  	"github.com/bazelbuild/rules_webtesting/go/bazel"
    28  	"github.com/bazelbuild/rules_webtesting/go/portpicker"
    29  	"github.com/bazelbuild/rules_webtesting/go/webtest"
    30  	"github.com/tebeka/selenium"
    31  )
    32  
    33  var testpage = ""
    34  
    35  func TestMain(m *testing.M) {
    36  	port, err := portpicker.PickUnusedPort()
    37  	if err != nil {
    38  		log.Fatal(err)
    39  	}
    40  
    41  	dir, err := bazel.Runfile("testdata/")
    42  	if err != nil {
    43  		log.Fatal(err)
    44  	}
    45  
    46  	go func() {
    47  		log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), http.FileServer(http.Dir(dir))))
    48  	}()
    49  
    50  	testpage = fmt.Sprintf("http://localhost:%d/testpage.html", port)
    51  
    52  	os.Exit(m.Run())
    53  }
    54  
    55  func TestOfElement(t *testing.T) {
    56  	driver, err := webtest.NewWebDriverSession(selenium.Capabilities{})
    57  	if err != nil {
    58  		t.Fatal(err)
    59  	}
    60  
    61  	defer driver.Quit()
    62  
    63  	shotter, err := New(driver)
    64  
    65  	if err := driver.Get(testpage); err != nil {
    66  		t.Fatal(err)
    67  	}
    68  
    69  	el, err := driver.FindElement(selenium.ByTagName, "input")
    70  	if err != nil {
    71  		t.Fatal(err)
    72  	}
    73  
    74  	img, err := shotter.Of(el).TakeScreenshot()
    75  
    76  	if err != nil {
    77  		t.Fatal(err)
    78  	}
    79  
    80  	tmpDir, err := bazel.NewTmpDir("crop_test")
    81  	if err != nil {
    82  		t.Fatal(err)
    83  	}
    84  
    85  	outPath := filepath.Join(tmpDir, "of-element.png")
    86  
    87  	log.Printf("Output file: %q", outPath)
    88  
    89  	if err := ioutil.WriteFile(outPath, img, 0660); err != nil {
    90  		t.Fatal(err)
    91  	}
    92  
    93  	check, err := os.Open(outPath)
    94  	if err != nil {
    95  		t.Fatal(err)
    96  	}
    97  	defer check.Close()
    98  
    99  	config, err := png.DecodeConfig(check)
   100  	if err != nil {
   101  		t.Fatal(err)
   102  	}
   103  
   104  	if config.Width != 200 || config.Height != 200 {
   105  		t.Fatalf("got size == %d, %d, expected 200, 200", config.Width, config.Height)
   106  	}
   107  }
   108  
   109  func TestExcluding(t *testing.T) {
   110  	driver, err := webtest.NewWebDriverSession(selenium.Capabilities{})
   111  	if err != nil {
   112  		t.Fatal(err)
   113  	}
   114  
   115  	defer driver.Quit()
   116  
   117  	shotter, err := New(driver)
   118  
   119  	if err := driver.Get(testpage); err != nil {
   120  		t.Fatal(err)
   121  	}
   122  
   123  	outer, err := driver.FindElement(selenium.ByID, "outer-div")
   124  	if err != nil {
   125  		t.Fatal(err)
   126  	}
   127  
   128  	ex1, err := driver.FindElement(selenium.ByID, "inner-div1")
   129  	if err != nil {
   130  		t.Fatal(err)
   131  	}
   132  
   133  	ex2, err := driver.FindElement(selenium.ByID, "b")
   134  	if err != nil {
   135  		t.Fatal(err)
   136  	}
   137  
   138  	img, err := shotter.Of(outer).Excluding(ex1).Excluding(ex2).TakeScreenshot()
   139  
   140  	if err != nil {
   141  		t.Fatal(err)
   142  	}
   143  
   144  	tmpDir, err := bazel.NewTmpDir("exclude-element")
   145  	if err != nil {
   146  		t.Fatal(err)
   147  	}
   148  
   149  	outPath := filepath.Join(tmpDir, "cropped.png")
   150  
   151  	log.Printf("Output file: %q", outPath)
   152  
   153  	if err := ioutil.WriteFile(outPath, img, 0660); err != nil {
   154  		t.Fatal(err)
   155  	}
   156  }