PR to update the golden samples test to only run on migrated samples (#44471)

Author: jairmyree

sdk/tools/azure-openrewrite/pom.xml

@@ -223,7 +223,6 @@
               <suppressionsLocation>${project.basedir}/../../../eng/code-quality-reports/src/main/resources/checkstyle/checkstyle-suppressions.xml</suppressionsLocation>
               <headerLocation>${project.basedir}/../../../eng/code-quality-reports/src/main/resources/checkstyle/java.header</headerLocation>
               <propertyExpansion>samedir=</propertyExpansion>
-              <encoding>UTF-8</encoding>
               <consoleOutput>true</consoleOutput>
               <includeTestSourceDirectory>true</includeTestSourceDirectory>
               <linkXRef>true</linkXRef>

sdk/tools/azure-openrewrite/src/test/java/com/azure/openrewrite/migration/FullSampleMigrationTest.java

@@ -28,7 +28,7 @@ public class FullSampleMigrationTest implements RewriteTest {
 
     static final String GOLDEN_IMAGE = "v2";
     static final String ORIGINAL_IMAGE = "v1";
-
+    static final String RECIPE_NAME = "com.azure.openrewrite.migrateToVNext";
     static final String[] DISABLED_DIRS = {
         "src/test/resources/migrationExamples/azure-storage-blob/"
     };
@@ -67,13 +67,13 @@ static Stream<Path> gatherAllRegularFiles(Path sampleDir) throws IOException {
 
     @Override
     public void defaults(RecipeSpec spec) {
-        spec.recipeFromResources("com.azure.openrewrite.migrateToVNext")
+        System.out.printf("Active recipe: %s\n", RECIPE_NAME);
+        spec.recipeFromResources(RECIPE_NAME)
             .typeValidationOptions(TypeValidation.none());
     }
 
 
 
-
     @ParameterizedTest
     @MethodSource("sampleDirectories")
     public void testGoldenImage(Path sampleDir) throws Exception {
@@ -98,14 +98,20 @@ public void testGoldenImage(Path sampleDir) throws Exception {
     public void assertFullMigration(Map<String,String> fileMap) throws IOException {
         List<SourceSpecs> sourceSpecs = new ArrayList<SourceSpecs>();
         for (Map.Entry<String,String> entry : fileMap.entrySet()) {
+
             String before = Files.readAllLines(Paths.get(entry.getKey()))
                 .stream()
                 .reduce("", (a, b) -> a + b + "\n");
 
             String after = Files.readAllLines(Paths.get(entry.getValue()))
                 .stream()
                 .reduce("", (a, b) -> a + b + "\n");
-            sourceSpecs.add(java(before, after));
+            if (!before.equals(after)) {
+                sourceSpecs.add(java(before, after));
+            }
+        }
+        if (sourceSpecs.isEmpty()) {
+            Assumptions.abort("Migration samples are identical. No migration detected.");
         }
         rewriteRun(
             sourceSpecs.toArray(new SourceSpecs[sourceSpecs.size()])