JSON static file test

Test we correctly load a JSON static file. This test will fail if we try
to parse the JSON as YAML.

core/src/test/java/io/smallrye/openapi/api/SmallRyeOpenAPIBuilderTest.java

@@ -38,6 +38,31 @@ void testStaticFileLoadedFromClasspath() throws Exception {
         OpenAPI model = result.model();
         assertEquals("Loaded from the class path", model.getInfo().getTitle());
     }
+
+    @Test
+    void testStaticJsonFileLoadedFromClasspath() throws Exception {
+        URL loaderRoot = getClass()
+                .getClassLoader()
+                .getResource("classloaderjson/META-INF/openapi.json")
+                .toURI()
+                .resolve("..")
+                .toURL();
+
+        ClassLoader custom = new URLClassLoader(
+                new URL[] { loaderRoot },
+                Thread.currentThread().getContextClassLoader());
+
+        SmallRyeOpenAPI result = SmallRyeOpenAPI.builder()
+                .withApplicationClassLoader(custom)
+                .enableModelReader(false)
+                .enableStandardFilter(false)
+                .enableAnnotationScan(false)
+                .enableStandardStaticFiles(true)
+                .build();
+
+        OpenAPI model = result.model();
+        assertEquals("Loaded from the class path", model.getInfo().getTitle());
+    }
 
     @Test
     void testInvalidTypesInStaticFileDropped() {

core/src/test/resources/classloaderjson/META-INF/openapi.json

@@ -0,0 +1,9 @@
+{
+	"openapi": "3.1.0",
+	"info": {
+		"title": "Loaded from the class path",
+		"description": "This document uses tabs so that it doesn't parse as YAML",
+		"version": "1.0.0"
+	},
+	"paths": {}
+}