diff --git a/onyxia-api/src/test/java/fr/insee/onyxia/api/services/JsonSchemaResolutionServiceTest.java b/onyxia-api/src/test/java/fr/insee/onyxia/api/services/JsonSchemaResolutionServiceTest.java
new file mode 100644
index 00000000..9aa751e4
--- /dev/null
+++ b/onyxia-api/src/test/java/fr/insee/onyxia/api/services/JsonSchemaResolutionServiceTest.java
@@ -0,0 +1,133 @@
+package fr.insee.onyxia.api.services;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+import tools.jackson.databind.JsonNode;
+import tools.jackson.databind.ObjectMapper;
+
+/**
+ * The schema registries are filled by a {@code @PostConstruct} method: these tests go through the
+ * Spring context so that they fail if that lifecycle callback is not invoked (e.g. when it is
+ * annotated with {@code javax.annotation.PostConstruct}, which Spring 7 ignores).
+ */
+@SpringBootTest(
+        classes = {
+            JsonSchemaResolutionService.class,
+            JsonSchemaRegistryService.class,
+            JsonSchemaProfileRegistryService.class
+        })
+class JsonSchemaResolutionServiceTest {
+
+    @TempDir static Path profileDirectory;
+
+    @DynamicPropertySource
+    static void profileSchemaDirectory(DynamicPropertyRegistry registry) throws IOException {
+        Files.writeString(
+                profileDirectory.resolve("default"),
+                """
+                {"type": "object", "properties": {"email": {"type": "string"}}}
+                """);
+        registry.add("profile.schema.directory", profileDirectory::toString);
+    }
+
+    private final ObjectMapper mapper = new ObjectMapper();
+
+    @Autowired JsonSchemaResolutionService resolutionService;
+
+    @Autowired JsonSchemaRegistryService registryService;
+
+    @Autowired JsonSchemaProfileRegistryService profileRegistryService;
+
+    @Test
+    void registryLoadsBundledSchemas() {
+        assertFalse(registryService.listSchemas().isEmpty());
+        assertNotNull(registryService.getSchema(List.of(), "ide/resources.json"));
+        assertNotNull(registryService.getSchema(List.of(), "nodeSelector.json"));
+    }
+
+    @Test
+    void overwriteSchemaWithIsReplacedByTheRegistrySchema() {
+        JsonNode schema =
+                mapper.readTree(
+                        """
+                        {
+                          "type": "object",
+                          "properties": {
+                            "resources": {
+                              "type": "object",
+                              "x-onyxia": {"overwriteSchemaWith": "ide/resources.json"}
+                            },
+                            "nodeSelector": {
+                              "type": "object",
+                              "x-onyxia": {"overwriteSchemaWith": "nodeSelector.json"}
+                            }
+                          }
+                        }
+                        """);
+
+        JsonNode resolved = resolutionService.resolveReferences(schema, List.of());
+
+        JsonNode resources = resolved.at("/properties/resources");
+        assertEquals("Resources", resources.path("title").asString());
+        assertTrue(resources.at("/properties/requests/properties/cpu").isObject());
+        assertTrue(resources.at("/x-onyxia/overwriteSchemaWith").isMissingNode());
+
+        JsonNode nodeSelector = resolved.at("/properties/nodeSelector");
+        assertEquals("Node Selector", nodeSelector.path("title").asString());
+        assertEquals(
+                "region.nodeSelector",
+                nodeSelector.at("/x-onyxia/overwriteDefaultWith").asString());
+    }
+
+    @Test
+    void internalReferencesAreResolved() {
+        JsonNode schema =
+                mapper.readTree(
+                        """
+                        {
+                          "definitions": {"port": {"type": "integer", "default": 8080}},
+                          "properties": {"port": {"$ref": "#/definitions/port"}}
+                        }
+                        """);
+
+        JsonNode port =
+                resolutionService.resolveReferences(schema, List.of()).at("/properties/port");
+
+        assertEquals(8080, port.path("default").asInt());
+        assertTrue(port.path("$ref").isMissingNode());
+    }
+
+    @Test
+    void resolutionDoesNotMutateTheChartSchema() {
+        JsonNode schema =
+                mapper.readTree(
+                        """
+                        {"properties": {"resources": {"x-onyxia": {"overwriteSchemaWith": "ide/resources.json"}}}}
+                        """);
+        JsonNode original = schema.deepCopy();
+
+        resolutionService.resolveReferences(schema, List.of());
+
+        assertEquals(original, schema);
+    }
+
+    @Test
+    void profileRegistryLoadsDefaultProfileSchema() {
+        JsonNode profile = profileRegistryService.getProfileSchema();
+        assertNotNull(profile);
+        assertEquals("string", profile.at("/properties/email/type").asString());
+    }
+}