add helper method dropDatabase

src/database.ts

@@ -3,6 +3,7 @@ import { CommandCursor } from "./protocol/mod.ts";
 import { CreateCollectionOptions, CreateUserOptions } from "./types.ts";
 import { Cluster } from "./cluster.ts";
 import { Document } from "../deps.ts";
+import { WriteConcern } from "./types/read_write_concern.ts";
 
 interface ListCollectionsReponse {
   cursor: {
@@ -30,6 +31,13 @@ export class Database {
     this.#cluster = cluster;
   }
 
+  async dropDatabase(writeConcern?: WriteConcern) {
+    return await this.#cluster.protocol.commandSingle(this.name, {
+      dropDatabase: 1,
+      writeConcern,
+    });
+  }
+
   collection<T = Document>(name: string): Collection<T> {
     return new Collection<T>(this.#cluster.protocol, this.name, name);
   }

src/utils/srv.ts

@@ -71,15 +71,13 @@ export class Srv {
     );
     if (!(srvRecord?.length > 0)) {
       throw new SRVError(
-        `Expected at least one SRV record, received ${srvRecord
-          ?.length} for url ${url}`,
+        `Expected at least one SRV record, received ${srvRecord?.length} for url ${url}`,
       );
     }
     const txtRecords = await this.resolver.resolveDns(url, "TXT");
     if (txtRecords?.length !== 1) {
       throw new SRVError(
-        `Expected exactly one TXT record, received ${txtRecords
-          ?.length} for url ${url}`,
+        `Expected exactly one TXT record, received ${txtRecords?.length} for url ${url}`,
       );
     }
 

tests/cases/10_command_helpers.ts

@@ -0,0 +1,31 @@
+import { MongoClient } from "../../mod.ts";
+import { assert, assertEquals } from "../test.deps.ts";
+
+Deno.test({
+  name: "db.dropDatabase",
+  fn: async (t) => {
+    const client = new MongoClient();
+    const databaseName = `TEST_DATABASE_MUST_NOT_MATCH_${+new Date()}`;
+    const db = await client.connect(
+      `mongodb://127.0.0.1:27017/${databaseName}`,
+    );
+    const collectioName = `${databaseName}_collection`;
+
+    // To create database physically
+    await db.createCollection<{ foo: string }>(`${collectioName}`);
+
+    await t.step("test if the database is dropped", async () => {
+      // A sanity check to test existence of the collection inside the test db
+      assertEquals((await db.listCollectionNames()).length, 1);
+      const result = await db.dropDatabase();
+
+      assert(result);
+      assertEquals(result.ok, 1);
+
+      // The collection inside the test db must not exist
+      assertEquals((await db.listCollectionNames()).length, 0);
+    });
+
+    client.close();
+  },
+});