Rename test methods and YAML files to include issue ID #865

Co-authored-by: DrSatyr <8143518+DrSatyr@users.noreply.github.com>

Author: Copilot

core/src/test/java/org/openapitools/openapidiff/core/output/HtmlRenderTest.java

@@ -21,23 +21,25 @@ public void renderDoesNotFailWhenPropertyHasBeenRemoved() {
   }
 
   @Test
-  public void renderDoesNotFailWhenSchemaIsNullButExampleChanged() {
+  public void issue865_renderDoesNotFailWhenSchemaIsNullButExampleChanged() {
     HtmlRender render = new HtmlRender();
     ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
     OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
     ChangedOpenApi diff =
-        OpenApiCompare.fromLocations("null_schema_issue_1.yaml", "null_schema_issue_2.yaml");
+        OpenApiCompare.fromLocations(
+            "issue-865-null-schema-1.yaml", "issue-865-null-schema-2.yaml");
     render.render(diff, outputStreamWriter);
     assertThat(outputStream.toString()).isNotBlank();
   }
 
   @Test
-  public void renderWithShowAllChangesDoesNotFailWhenSchemaIsNullButExampleChanged() {
+  public void issue865_renderWithShowAllChangesDoesNotFailWhenSchemaIsNullButExampleChanged() {
     HtmlRender render = new HtmlRender(true);
     ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
     OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
     ChangedOpenApi diff =
-        OpenApiCompare.fromLocations("null_schema_issue_1.yaml", "null_schema_issue_2.yaml");
+        OpenApiCompare.fromLocations(
+            "issue-865-null-schema-1.yaml", "issue-865-null-schema-2.yaml");
     render.render(diff, outputStreamWriter);
     assertThat(outputStream.toString()).isNotBlank();
   }