anyOf discriminator found but none of the alternatives match

src/error-handlers/anyOf.js

@@ -151,9 +151,38 @@ const anyOfErrorHandler = async (normalizedErrors, instance, localization) => {
           }
           // Discriminator identified, but none of the alternatives match
           if (discriminatedAlternatives.length === 0) {
-            // TODO: For now, it will use the schema description strategy
-          }
+            let discriminatorErrorFound = false;
+            for (const discriminatorLocation of discriminator) {
+              /** @type Set<string> */
+              const messageSet = new Set();
+              let matchesAny = false;
+              for (const alternative of allAlternatives) {
+                if (discriminatorLocation in alternative) {
+                  const errorObjects = await getErrors({ [discriminatorLocation]: alternative[discriminatorLocation] }, instance, localization);
+                  if (errorObjects.length === 0) {
+                    matchesAny = true;
+                    break;
+                  }
+                  for (const errorObject of errorObjects) {
+                    messageSet.add(errorObject.message);
+                  }
+                }
+              }
 
+              if (!matchesAny) {
+                discriminatorErrorFound = true;
+                errors.push({
+                  message: localization.getAnyOfBulletsErrorMessage([...messageSet]),
+                  instanceLocation: discriminatorLocation,
+                  schemaLocation
+                });
+              }
+            }
+
+            if (discriminatorErrorFound) {
+              continue;
+            }
+          }
           // Last resort, select the alternative with the most properties matching the instance
           const instanceProperties = new Set(Instance.values(instance).map((node) => Instance.uri(node)));
           let maxMatches = -1;

src/keyword-error-message.test.js

@@ -976,7 +976,7 @@ describe("Error messages", async () => {
     ]);
   });
 
-  test.skip("anyOf - discriminator with no matches", async () => {
+  test("anyOf - discriminator with no matches", async () => {
     registerSchema({
       $schema: "https://json-schema.org/draft/2020-12/schema",
       anyOf: [
@@ -1019,6 +1019,10 @@ describe("Error messages", async () => {
           absoluteKeywordLocation: `https://example.com/main#/anyOf/1/properties/type/const`,
           instanceLocation: "#/type"
         },
+        {
+          absoluteKeywordLocation: `https://example.com/main#/anyOf/1/properties/box/type`,
+          instanceLocation: "#/box"
+        },
         {
           absoluteKeywordLocation: `https://example.com/main#/anyOf`,
           instanceLocation: "#"
@@ -1032,7 +1036,10 @@ describe("Error messages", async () => {
       {
         schemaLocation: `https://example.com/main#/anyOf`,
         instanceLocation: "#/type",
-        message: `Invalid value. Expected "a", "b". Found "d".`
+        message: localization.getAnyOfBulletsErrorMessage([
+          localization.getConstErrorMessage("a"),
+          localization.getConstErrorMessage("b")
+        ])
       }
     ]);
   });