Update an example test (downloading and verifying files)

Author: mdmintz

examples/test_download_files.py

@@ -1,3 +1,4 @@
+import math
 from seleniumbase import BaseCase
 
 
@@ -8,8 +9,45 @@ def test_download_files(self):
         pkg_header = self.get_text("h1.package-header__name")
         pkg_name = pkg_header.replace(" ", "-")
         whl_file = pkg_name + "-py2.py3-none-any.whl"
-        self.click('div#files a[href$="%s"]' % whl_file)
-        self.assert_downloaded_file(whl_file)
         tar_gz_file = pkg_name + ".tar.gz"
+
+        # Click the links to download the files
+        self.click('div#files a[href$="%s"]' % whl_file)
         self.click('div#files a[href$="%s"]' % tar_gz_file)
+
+        # Verify that the downloaded files appear in the [Downloads Folder]
+        # (This only guarantees that the exact file name is in the folder.)
+        # (This does not guarantee that the downloaded files are complete.)
+        # (Later, we'll check that the files were downloaded successfully.)
+        self.assert_downloaded_file(whl_file)
         self.assert_downloaded_file(tar_gz_file)
+
+        self.sleep(1)  # Add more time to make sure downloads have completed
+
+        # Get the actual size of the downloaded files (in bytes)
+        whl_path = self.get_path_of_downloaded_file(whl_file)
+        with open(whl_path, 'rb') as f:
+            whl_file_bytes = len(f.read())
+        print("\n%s | Download = %s bytes." % (whl_file, whl_file_bytes))
+        tar_gz_path = self.get_path_of_downloaded_file(tar_gz_file)
+        with open(tar_gz_path, 'rb') as f:
+            tar_gz_file_bytes = len(f.read())
+        print("%s | Download = %s bytes." % (tar_gz_file, tar_gz_file_bytes))
+
+        # Check to make sure the downloaded files are not empty or too small
+        self.assert_true(whl_file_bytes > 5000)
+        self.assert_true(tar_gz_file_bytes > 5000)
+
+        # Get file sizes in kB to compare actual values with displayed values
+        whl_file_kb = whl_file_bytes / 1000.0
+        whl_line = self.get_text("tbody tr:nth-of-type(1) th")
+        whl_displayed_kb = float(whl_line.split("(")[1].split(" ")[0])
+        tar_gz_file_kb = tar_gz_file_bytes / 1000.0
+        tar_gz_line = self.get_text("tbody tr:nth-of-type(2) th")
+        tar_gz_displayed_kb = float(tar_gz_line.split("(")[1].split(" ")[0])
+
+        # Verify downloaded files are the correct size (account for rounding)
+        self.assert_true(abs(
+            math.floor(whl_file_kb) - math.floor(whl_displayed_kb)) < 2)
+        self.assert_true(abs(
+            math.floor(tar_gz_file_kb) - math.floor(tar_gz_displayed_kb)) < 2)