feat: create template class

Signed-off-by: Otavio Santana <[email protected]>

core/src/main/java/expert/os/harperdb/Server.java

@@ -84,6 +84,11 @@ public CreateTableBuilder createTable(String schema){
         return new CreateTableBuilder(schema, this);
     }
 
+    public Template template(String database){
+        Objects.requireNonNull(database, "database is required");
+        return new Template(database, this);
+    }
+
     boolean executeTableCreation(CreateTable operation) {
         HttpRequest request = createRequest()
                 .POST(ofByteArray(INSTANCE.writeValueAsBytes(operation)))

core/src/main/java/expert/os/harperdb/Template.java

@@ -0,0 +1,11 @@
+package expert.os.harperdb;
+
+public final class Template {
+    private final String database;
+    private final Server server;
+    Template(String database, Server server) {
+
+        this.database = database;
+        this.server = server;
+    }
+}

core/src/test/java/expert/os/harperdb/ServerTest.java

@@ -71,6 +71,21 @@ void shouldCreateTable() {
         });
     }
 
+    @Test
+    void shouldReturnNPEWhenTemplateIsNull() {
+        Server server = getServer();
+
+        Assertions.assertThrows(NullPointerException.class, () -> server.template(null));
+    }
+
+    @Test
+    void shouldCreateTemplate() {
+        Server server = getServer();
+
+        SoftAssertions.assertSoftly(softly -> {
+            softly.assertThat(server.template("test")).isNotNull();
+        });
+    }
 
     private Server getServer() {
         return ServerBuilder.of(container.host())