Let the user choose a custom db name (#83)

* Let the user choose a custom db name

Fixes #74

* Hardcode MongoDB image version

This works around a breaking change in the latest image which isn't
compatible with Testcontainers.

See testcontainers/testcontainers-java#5774

src/main/docs/guide/modules-mongodb.adoc

@@ -1,3 +1,5 @@
 MongoDB support will automatically start a https://www.mongodb.com[MongoDB container] and provide the value of the `mongodb.uri` property.
 
 The default image can be overwritten by setting the `test-resources.containers.mongodb.image-name` property.
+
+The default database name can be overwritten by setting the `test-resources.containers.mongodb.db-name` property.

test-resources-mongodb/src/main/java/io/micronaut/testresources/mongodb/MongoDBTestResourceProvider.java

@@ -31,7 +31,11 @@
 public class MongoDBTestResourceProvider extends AbstractTestContainersProvider<MongoDBContainer> {
 
     public static final String MONGODB_SERVER_URI = "mongodb.uri";
-    public static final String DEFAULT_IMAGE = "mongo";
+    public static final String DEFAULT_IMAGE = "mongo:5";
+    public static final String SIMPLE_NAME = "mongodb";
+    public static final String DB_NAME = "containers." + SIMPLE_NAME + ".db-name";
+
+    private String dbName;
 
     @Override
     public List<String> getResolvableProperties(Map<String, Collection<String>> propertyEntries, Map<String, Object> testResourcesConfig) {
@@ -40,7 +44,7 @@ public List<String> getResolvableProperties(Map<String, Collection<String>> prop
 
     @Override
     protected String getSimpleName() {
-        return "mongodb";
+        return SIMPLE_NAME;
     }
 
     @Override
@@ -50,12 +54,17 @@ protected String getDefaultImageName() {
 
     @Override
     protected MongoDBContainer createContainer(DockerImageName imageName, Map<String, Object> requestedProperties, Map<String, Object> testResourcesConfiguration) {
+        Object configuredDbName = testResourcesConfiguration.get(DB_NAME);
+        if (configuredDbName != null) {
+            this.dbName = configuredDbName.toString();
+        }
         return new MongoDBContainer(imageName);
     }
 
     @Override
     protected Optional<String> resolveProperty(String propertyName, MongoDBContainer container) {
-        return Optional.of(container.getReplicaSetUrl());
+        String url = dbName == null ? container.getReplicaSetUrl() : container.getReplicaSetUrl(dbName);
+        return Optional.of(url);
     }
 
     @Override

test-resources-mongodb/src/test/groovy/io/micronaut/testresources/mongodb/CustomDbNameMongoDBTest.groovy

@@ -0,0 +1,31 @@
+package io.micronaut.testresources.mongodb
+
+import io.micronaut.context.annotation.Value
+import io.micronaut.test.extensions.spock.annotation.MicronautTest
+import jakarta.inject.Inject
+
+@MicronautTest(environments = ["test", "custom-db-name"])
+class CustomDbNameMongoDBTest extends AbstractMongoDBSpec {
+
+    @Inject
+    BookRepository bookRepository
+
+    @Value("\${mongodb.uri}")
+    String mongodbUri
+
+    def "automatically starts a MongoDB container"() {
+        given:
+        def book = new Book(title: "Micronaut for Spring developers")
+        bookRepository.save(book)
+
+        when:
+        def books = bookRepository.findAll()
+
+        then:
+        books.size() == 1
+
+        and:
+        mongodbUri.endsWith "/custom-db-name"
+    }
+
+}

test-resources-mongodb/src/test/resources/application-custom-db-name.yml

@@ -0,0 +1,4 @@
+test-resources:
+  containers:
+    mongodb:
+      db-name: custom-db-name