Compare thumbnail files instead of stringifying them

src/org/labkey/test/TestFileUtils.java

@@ -64,8 +64,6 @@
 import java.nio.file.Paths;
 import java.nio.file.SimpleFileVisitor;
 import java.nio.file.attribute.BasicFileAttributes;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
 import java.security.Security;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -122,21 +120,6 @@ public static String getFileContents(Path path)
         }
     }
 
-    /**
-     * Compute MD5 hash for the given file. Useful checking file equivalence.
-     */
-    public static String getMD5Hash(Path path)
-    {
-        try
-        {
-            return new String(MessageDigest.getInstance("MD5").digest(Files.readAllBytes(path)), StandardCharsets.UTF_8);
-        }
-        catch (IOException | NoSuchAlgorithmException fail)
-        {
-            throw new RuntimeException(fail);
-        }
-    }
-
     public static String getStreamContentsAsString(InputStream is) throws IOException
     {
         return StringUtils.join(IOUtils.readLines(is, Charset.defaultCharset()).toArray(), System.lineSeparator());
@@ -372,10 +355,46 @@ public static File getTestTempDir()
         return new File(buildDir, "testTemp");
     }
 
-    public static File ensureTestTempDir() throws IOException
+    /**
+     * Creates a directory under the 'testTemp' directory: 'build/testTemp/[children]'
+     * @param children will be appended to the testTemp path
+     * @return A file pointer to the specified directory. The directory will exist
+     * @throws IOException if the directories were not created
+     */
+    public static File ensureTestTempDir(String... children) throws IOException
     {
         File file = getTestTempDir();
+        for (String child : children)
+        {
+            file = new File(file, child);
+        }
+
         FileUtils.forceMkdir(file);
+
+        return file;
+    }
+
+    /**
+     * Creates a directory under the 'testTemp' directory to contain the specified file. 'build/testTemp[/children]/lastChild'
+     * @param children will be appended to the testTemp path to construct the desired file's path
+     * @return A file pointer to the specified file. The file's parents will exist but the file might not
+     * @throws IOException if the parent directories were not created
+     */
+    public static File ensureTestTempFile(String... children) throws IOException
+    {
+        File file = getTestTempDir();
+
+        for (String child : children)
+        {
+            file = new File(file, child);
+        }
+
+        if (file.toString().length() == getTestTempDir().toString().length())
+        {
+            throw new IllegalArgumentException("No valid children were provided: " + Arrays.toString(children));
+        }
+        FileUtils.forceMkdirParent(file);
+
         return file;
     }
 

src/org/labkey/test/tests/FileAttachmentColumnTest.java

@@ -553,9 +553,9 @@ private void validateSampleData(String sampleType, String folderPath, List<File>
                  {
                      // verify fie download behavior
                      File downloadedFile = doAndWaitForDownload(() -> optionalFileLink.get().click());
-                     checker().wrapAssertion(() -> Assertions.assertThat(TestFileUtils.getMD5Hash(downloadedFile.toPath()))
+                     checker().wrapAssertion(() -> Assertions.assertThat(downloadedFile)
                              .as("expect the downloaded file to be the expected file")
-                             .isEqualTo(TestFileUtils.getMD5Hash(file.toPath())));   // guard against renames like file2.xyz
+                             .hasSameBinaryContentAs(file));   // guard against renames like file2.xyz
                  }
             }
         }
@@ -579,9 +579,9 @@ private void validateAssayRun(String assayName, String folderPath, String runNam
         if (optionalFileLink.isPresent())
         {
             var file = doAndWaitForDownload(()-> optionalFileLink.get().click());
-            checker().wrapAssertion(()-> Assertions.assertThat(TestFileUtils.getMD5Hash(file.toPath()))
+            checker().wrapAssertion(()-> Assertions.assertThat(file)
                     .as("expect the downloaded file to have equivalent content")
-                    .isEqualTo(TestFileUtils.getMD5Hash(runFile.toPath())));
+                    .hasSameBinaryContentAs(runFile));
         }
 
         var resultsPage = runsPage.clickAssayIdLink(runName);
@@ -647,9 +647,9 @@ private void validateDatasetData(String datasetName, String folderPath, List<Fil
                 {
                     // verify fie download behavior
                     File downloadedFile = doAndWaitForDownload(() -> optionalFileLink.get().click());
-                    checker().wrapAssertion(() -> Assertions.assertThat(TestFileUtils.getMD5Hash(downloadedFile.toPath()))
+                    checker().wrapAssertion(() -> Assertions.assertThat(downloadedFile)
                             .as("expect the downloaded file to be the expected file")
-                            .isEqualTo(TestFileUtils.getMD5Hash(file.toPath())));   // guard against renames like file2.xyz
+                            .hasSameBinaryContentAs(file));   // guard against renames like file2.xyz
                 }
             }
         }

src/org/labkey/test/tests/SimpleModuleTest.java

@@ -16,8 +16,8 @@
 package org.labkey.test.tests;
 
 import org.apache.commons.lang3.StringUtils;
-import org.apache.commons.text.similarity.LevenshteinDistance;
 import org.apache.hc.core5.http.HttpStatus;
+import org.assertj.core.api.Assertions;
 import org.intellij.lang.annotations.Language;
 import org.jetbrains.annotations.Nullable;
 import org.junit.Assert;
@@ -62,6 +62,7 @@
 import org.labkey.test.util.Maps;
 import org.labkey.test.util.PortalHelper;
 import org.labkey.test.util.RReportHelper;
+import org.labkey.test.util.SimpleHttpRequest;
 import org.labkey.test.util.TestLogger;
 import org.labkey.test.util.WikiHelper;
 import org.labkey.test.util.ext4cmp.Ext4FieldRef;
@@ -1125,7 +1126,7 @@ private void doTestQueryViews()
     }
 
     @LogMethod
-    private void doTestReports()
+    private void doTestReports() throws IOException
     {
         RReportHelper _rReportHelper = new RReportHelper(this);
         WikiHelper wikiHelper = new WikiHelper(this);
@@ -1177,7 +1178,7 @@ private void doTestReports()
     }
 
     @LogMethod
-    private void doTestReportThumbnails()
+    private void doTestReportThumbnails() throws IOException
     {
         goToProjectHome();
         log("Verify custom module report thumbnail images");
@@ -1187,14 +1188,13 @@ private void doTestReportThumbnails()
     }
 
     @LogMethod
-    private void doTestReportIcon()
+    private void doTestReportIcon() throws IOException
     {
         log("Verify custom module report icon image");
         setFormElement(Locator.xpath("//table[contains(@class, 'dataset-search')]//input"), KNITR_PEOPLE);
         waitForElementToDisappear(Locator.tag("tr").withClass("x4-grid-row").containing(WANT_TO_BE_COOL).notHidden());
 
         File expectedIconFile = TestFileUtils.getSampleData(THUMBNAIL_FOLDER + KNITR_PEOPLE + ICON_FILENAME);
-        String expectedIcon = TestFileUtils.getFileContents(expectedIconFile);
 
         WebElement img = waitForElement(Locator.tag("img").withClass("dataview-icon").withoutClass("x4-tree-icon-parent").notHidden());
         String backgroundImage = StringUtils.trimToEmpty(img.getCssValue("background-image"));
@@ -1204,12 +1204,10 @@ private void doTestReportIcon()
             Assert.fail("Module report icon style is not as expected: " + img.getDomAttribute("style"));
         }
         String iconUrl = matcher.group(1);
-        String iconData = WebTestHelper.getHttpResponse(iconUrl).getResponseBody();
+        File downloadedIcon = new SimpleHttpRequest(iconUrl).getResponseAsFile(TestFileUtils.ensureTestTempFile(KNITR_PEOPLE + ICON_FILENAME));
 
-        int lengthToCompare = 3000;
-        int diff = LevenshteinDistance.getDefaultInstance().apply(expectedIcon.substring(0, lengthToCompare), iconData.substring(0, lengthToCompare));
-        assertTrue("Module report icon is not as expected, diff is " + diff, expectedIcon.equals(iconData) ||
-                diff  <= lengthToCompare * 0.03); // Might be slightly different due to indentations, etc
+        Assertions.assertThat(downloadedIcon).as("Module report icon is not as expected")
+                .hasSameBinaryContentAs(expectedIconFile);
     }
 
     @LogMethod
@@ -1222,20 +1220,18 @@ private void doTestReportCreatedDate()
     }
 
     @LogMethod
-    private void verifyReportThumbnail(@LoggedParam String reportTitle)
+    private void verifyReportThumbnail(@LoggedParam String reportTitle) throws IOException
     {
         File expectedThumbnailFile = TestFileUtils.getSampleData(THUMBNAIL_FOLDER + reportTitle + THUMBNAIL_FILENAME);
-        String expectedThumbnail = TestFileUtils.getFileContents(expectedThumbnailFile);
 
         WebElement reportLink = waitForElement(Locator.xpath("//a[text()='" + reportTitle + "']"));
         mouseOver(reportLink);
         WebElement thumbnail = waitForElement(Locator.xpath("//div[@class='thumbnail']/img").notHidden());
-        String thumbnailData = WebTestHelper.getHttpResponse(thumbnail.getDomProperty("src")).getResponseBody();
+        File downloadedThumbnail = new SimpleHttpRequest(thumbnail.getDomProperty("src"))
+                .getResponseAsFile(TestFileUtils.ensureTestTempFile(reportTitle + THUMBNAIL_FILENAME));
 
-        int lengthToCompare = 5000;
-        int diff = LevenshteinDistance.getDefaultInstance().apply(expectedThumbnail.substring(0, lengthToCompare), thumbnailData.substring(0, lengthToCompare));
-        assertTrue("Module report thumbnail is not as expected, diff is " + diff, expectedThumbnail.equals(thumbnailData) ||
-                diff  <= lengthToCompare * 0.03); // Might be slightly different due to indentations, etc
+        Assertions.assertThat(downloadedThumbnail).as("Module report thumbnail is not as expected")
+                .hasSameBinaryContentAs(expectedThumbnailFile);
     }
 
     @LogMethod

src/org/labkey/test/util/SimpleHttpRequest.java

@@ -19,6 +19,7 @@
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.labkey.remoteapi.Connection;
+import org.labkey.test.TestFileUtils;
 import org.openqa.selenium.Cookie;
 import org.openqa.selenium.WebDriver;
 
@@ -219,16 +220,21 @@ else if (responseFilename != null && fileName.contains("."))
         }
     }
 
+    public File getResponseAsFile() throws IOException
+    {
+        return getResponseAsFile(TestFileUtils.ensureTestTempDir());
+    }
+
     private void useCopiedSession(HttpURLConnection con)
     {
         StringBuilder cookieString = new StringBuilder();
-        for (Map.Entry cookie : _cookies.entrySet())
+        for (Map.Entry<String, String> cookie : _cookies.entrySet())
         {
             if (cookie.getKey().equals(Connection.X_LABKEY_CSRF))
-                con.setRequestProperty((String)cookie.getKey(), (String)cookie.getValue());
+                con.setRequestProperty(cookie.getKey(), cookie.getValue());
 
             if (cookie.getKey().equals(Connection.JSESSIONID))
-                con.setRequestProperty((String)cookie.getKey(), (String)cookie.getValue());
+                con.setRequestProperty(cookie.getKey(), cookie.getValue());
 
             if (!cookieString.isEmpty())
                 cookieString.append("; ");