diff --git a/.github/workflows/quality-monitor.yml b/.github/workflows/quality-monitor.yml
index e9bf58e2..b398fac7 100644
--- a/.github/workflows/quality-monitor.yml
+++ b/.github/workflows/quality-monitor.yml
@@ -95,7 +95,8 @@ jobs:
                   "tools": [
                     {
                       "id": "revapi",
-                      "sourcePath": "src/main/java"
+                      "sourcePath": "src/main/java",
+                      "pattern": "**/target/revapi-result.json"
                     }
                   ]
                 },
diff --git a/pom.xml b/pom.xml
index c0cce756..8e2a48af 100644
--- a/pom.xml
+++ b/pom.xml
@@ -981,6 +981,16 @@
               <attachments>
                 <vetted>ok</vetted>
               </attachments>
+              <differences>
+                <item>
+                  <ignore>true</ignore>
+                  <regex>true</regex>
+                  <code>java.method.visibilityIncreased</code>
+                  <classSimpleName>PackageDetectorFactory</classSimpleName>
+                  <methodName>createPackageDetectors</methodName>
+                  <justification>Not used yet</justification>
+                </item>
+              </differences>
             </revapi.differences>
             <revapi.versions>
               <enabled>true</enabled>
diff --git a/src/main/java/edu/hm/hafner/util/CSharpNamespaceDetector.java b/src/main/java/edu/hm/hafner/util/CSharpNamespaceDetector.java
index 6b2eb2a6..370ec5f9 100644
--- a/src/main/java/edu/hm/hafner/util/CSharpNamespaceDetector.java
+++ b/src/main/java/edu/hm/hafner/util/CSharpNamespaceDetector.java
@@ -2,6 +2,8 @@
 
 import java.util.regex.Pattern;
 
+import edu.hm.hafner.util.PackageDetectorFactory.FileSystemFacade;
+
 /**
  * Detects the namespace of a C# workspace file.
  *
diff --git a/src/main/java/edu/hm/hafner/util/JavaPackageDetector.java b/src/main/java/edu/hm/hafner/util/JavaPackageDetector.java
index 66a09af2..5ba82168 100644
--- a/src/main/java/edu/hm/hafner/util/JavaPackageDetector.java
+++ b/src/main/java/edu/hm/hafner/util/JavaPackageDetector.java
@@ -2,6 +2,8 @@
 
 import java.util.regex.Pattern;
 
+import edu.hm.hafner.util.PackageDetectorFactory.FileSystemFacade;
+
 /**
  * Detects the package name of a Java file.
  *
diff --git a/src/main/java/edu/hm/hafner/util/KotlinPackageDetector.java b/src/main/java/edu/hm/hafner/util/KotlinPackageDetector.java
index 45f4222c..4fd7abcb 100644
--- a/src/main/java/edu/hm/hafner/util/KotlinPackageDetector.java
+++ b/src/main/java/edu/hm/hafner/util/KotlinPackageDetector.java
@@ -2,6 +2,8 @@
 
 import java.util.regex.Pattern;
 
+import edu.hm.hafner.util.PackageDetectorFactory.FileSystemFacade;
+
 /**
  * Detects the package name of a Kotlin file.
  *
diff --git a/src/main/java/edu/hm/hafner/util/PackageDetector.java b/src/main/java/edu/hm/hafner/util/PackageDetector.java
index af0cbd0c..a5650cf6 100644
--- a/src/main/java/edu/hm/hafner/util/PackageDetector.java
+++ b/src/main/java/edu/hm/hafner/util/PackageDetector.java
@@ -5,9 +5,7 @@
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.Charset;
-import java.nio.file.Files;
 import java.nio.file.InvalidPathException;
-import java.nio.file.Paths;
 import java.util.Optional;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -15,7 +13,7 @@
 
 import org.apache.commons.io.input.BOMInputStream;
 
-import com.google.errorprone.annotations.MustBeClosed;
+import edu.hm.hafner.util.PackageDetectorFactory.FileSystemFacade;
 
 /**
  * Base class for package detectors.
@@ -96,15 +94,4 @@ private Optional<String> detectPackageName(final Stream<String> lines) {
      * @return {@code true} if the classifier accepts the specified file for processing.
      */
     abstract boolean accepts(String fileName);
-
-    /**
-     * Facade for file system operations. May be replaced by stubs in test cases.
-     */
-    @VisibleForTesting
-    static class FileSystemFacade {
-        @MustBeClosed
-        InputStream openFile(final String fileName) throws IOException, InvalidPathException {
-            return Files.newInputStream(Paths.get(fileName));
-        }
-    }
 }
diff --git a/src/main/java/edu/hm/hafner/util/PackageDetectorFactory.java b/src/main/java/edu/hm/hafner/util/PackageDetectorFactory.java
index d5499543..b9f33a4b 100644
--- a/src/main/java/edu/hm/hafner/util/PackageDetectorFactory.java
+++ b/src/main/java/edu/hm/hafner/util/PackageDetectorFactory.java
@@ -1,6 +1,12 @@
 package edu.hm.hafner.util;
 
-import edu.hm.hafner.util.PackageDetector.FileSystemFacade;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Paths;
+
+import com.google.errorprone.annotations.MustBeClosed;
 
 /**
  * Factory to create package detectors.
@@ -17,8 +23,16 @@ public static PackageDetectorRunner createPackageDetectors() {
         return createPackageDetectors(new FileSystemFacade());
     }
 
+    /**
+     * Creates a new package detector runner that uses the detectors for Java, Kotlin, and C#.
+     *
+     * @param facade
+     *         the file system facade to use
+     *
+     * @return the package detector runner
+     */
     @VisibleForTesting
-    static PackageDetectorRunner createPackageDetectors(final FileSystemFacade facade) {
+    public static PackageDetectorRunner createPackageDetectors(final FileSystemFacade facade) {
         return new PackageDetectorRunner(
                 new JavaPackageDetector(facade),
                 new KotlinPackageDetector(facade),
@@ -28,4 +42,27 @@ static PackageDetectorRunner createPackageDetectors(final FileSystemFacade facad
     private PackageDetectorFactory() {
         // prevents instantiation
     }
+
+    /**
+     * Facade for file system operations. May be replaced by stubs in test cases.
+     */
+    @VisibleForTesting
+    public static class FileSystemFacade {
+        /**
+         * Opens the specified file.
+         *
+         * @param fileName
+         *         the name of the file to open
+         *
+         * @return the input stream to read the file
+         * @throws IOException
+         *         if the file could not be opened
+         * @throws InvalidPathException
+         *         the file name is invalid
+         */
+        @MustBeClosed
+        public InputStream openFile(final String fileName) throws IOException, InvalidPathException {
+            return Files.newInputStream(Paths.get(fileName));
+        }
+    }
 }
diff --git a/src/test/java/edu/hm/hafner/util/PackageDetectorRunnerTest.java b/src/test/java/edu/hm/hafner/util/PackageDetectorRunnerTest.java
index 73619377..a8b02773 100644
--- a/src/test/java/edu/hm/hafner/util/PackageDetectorRunnerTest.java
+++ b/src/test/java/edu/hm/hafner/util/PackageDetectorRunnerTest.java
@@ -10,7 +10,7 @@
 import org.junit.jupiter.params.provider.CsvSource;
 import org.junit.jupiter.params.provider.ValueSource;
 
-import edu.hm.hafner.util.PackageDetector.FileSystemFacade;
+import edu.hm.hafner.util.PackageDetectorFactory.FileSystemFacade;
 
 import static org.assertj.core.api.Assertions.*;
 import static org.mockito.Mockito.*;