JUnits JUnits JUnits, so many JUnits (#3537)

# Description of Changes

Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: pixeebot[bot] <104101892+pixeebot[bot]@users.noreply.github.com>

src/main/java/stirling/software/SPDF/EE/EEAppConfig.java

@@ -61,6 +61,7 @@ public class EEAppConfig {
     }
 
     // TODO: Remove post migration
+    @SuppressWarnings("deprecation")
     public void migrateEnterpriseSettingsToPremium(ApplicationProperties applicationProperties) {
         EnterpriseEdition enterpriseEdition = applicationProperties.getEnterpriseEdition();
         Premium premium = applicationProperties.getPremium();

src/main/java/stirling/software/SPDF/controller/api/converters/ConvertMarkdownToPdf.java

@@ -47,7 +47,8 @@ public class ConvertMarkdownToPdf {
             description =
                     "This endpoint takes a Markdown file input, converts it to HTML, and then to"
                             + " PDF format. Input:MARKDOWN Output:PDF Type:SISO")
-    public ResponseEntity<byte[]> markdownToPdf(@ModelAttribute GeneralFile generalFile) throws Exception {
+    public ResponseEntity<byte[]> markdownToPdf(@ModelAttribute GeneralFile generalFile)
+            throws Exception {
         MultipartFile fileInput = generalFile.getFileInput();
 
         if (fileInput == null) {

src/main/java/stirling/software/SPDF/controller/api/misc/CompressController.java

@@ -626,32 +626,32 @@ public class CompressController {
 
     // Scale factors for different optimization levels
     private double getScaleFactorForLevel(int optimizeLevel) {
-    	return switch (optimizeLevel) {
-        case 3 -> 0.85;
-        case 4 -> 0.75;
-        case 5 -> 0.65;
-        case 6 -> 0.55;
-        case 7 -> 0.45;
-        case 8 -> 0.35;
-        case 9 -> 0.25;
-        case 10 -> 0.15;
-        default -> 1.0;
-    };
+        return switch (optimizeLevel) {
+            case 3 -> 0.85;
+            case 4 -> 0.75;
+            case 5 -> 0.65;
+            case 6 -> 0.55;
+            case 7 -> 0.45;
+            case 8 -> 0.35;
+            case 9 -> 0.25;
+            case 10 -> 0.15;
+            default -> 1.0;
+        };
     }
 
     // JPEG quality for different optimization levels
     private float getJpegQualityForLevel(int optimizeLevel) {
-    	return switch (optimizeLevel) {
-        case 3 -> 0.85f;
-        case 4 -> 0.80f;
-        case 5 -> 0.75f;
-        case 6 -> 0.70f;
-        case 7 -> 0.60f;
-        case 8 -> 0.50f;
-        case 9 -> 0.35f;
-        case 10 -> 0.2f;
-        default -> 0.7f;
-    };
+        return switch (optimizeLevel) {
+            case 3 -> 0.85f;
+            case 4 -> 0.80f;
+            case 5 -> 0.75f;
+            case 6 -> 0.70f;
+            case 7 -> 0.60f;
+            case 8 -> 0.50f;
+            case 9 -> 0.35f;
+            case 10 -> 0.2f;
+            default -> 0.7f;
+        };
     }
 
     @PostMapping(consumes = "multipart/form-data", value = "/compress-pdf")

src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java

@@ -146,8 +146,8 @@ public class CertSignController {
             summary = "Sign PDF with a Digital Certificate",
             description =
                     "This endpoint accepts a PDF file, a digital certificate and related"
-                        + " information to sign the PDF. It then returns the digitally signed PDF"
-                        + " file. Input:PDF Output:PDF Type:SISO")
+                            + " information to sign the PDF. It then returns the digitally signed PDF"
+                            + " file. Input:PDF Output:PDF Type:SISO")
     public ResponseEntity<byte[]> signPDFWithCert(@ModelAttribute SignPDFWithCertRequest request)
             throws Exception {
         MultipartFile pdf = request.getFileInput();

src/main/java/stirling/software/SPDF/controller/api/security/GetInfoOnPDF.java

@@ -622,8 +622,8 @@ public class GetInfoOnPDF {
         permissionsNode.put("Document Assembly", getPermissionState(ap.canAssembleDocument()));
         permissionsNode.put("Extracting Content", getPermissionState(ap.canExtractContent()));
         permissionsNode.put(
-            "Extracting for accessibility",
-            getPermissionState(ap.canExtractForAccessibility()));
+                "Extracting for accessibility",
+                getPermissionState(ap.canExtractForAccessibility()));
         permissionsNode.put("Form Filling", getPermissionState(ap.canFillInForm()));
         permissionsNode.put("Modifying", getPermissionState(ap.canModify()));
         permissionsNode.put("Modifying annotations", getPermissionState(ap.canModifyAnnotations()));

src/main/java/stirling/software/SPDF/service/LanguageService.java

@@ -28,8 +28,7 @@ public class LanguageService {
 
     public Set<String> getSupportedLanguages() {
         try {
-            Resource[] resources =
-                    resourcePatternResolver.getResources("classpath*:messages_*.properties");
+            Resource[] resources = getResourcesFromPattern("classpath*:messages_*.properties");
 
             return Arrays.stream(resources)
                     .map(Resource::getFilename)
@@ -54,4 +53,9 @@ public class LanguageService {
             return new HashSet<>();
         }
     }
+
+    // Protected method to allow overriding in tests
+    protected Resource[] getResourcesFromPattern(String pattern) throws IOException {
+        return resourcePatternResolver.getResources(pattern);
+    }
 }