chore: Add integration test for JSON uploads over 5MB

Author: yoshi-automation

google-cloud-bigquery/Gemfile

@@ -25,6 +25,7 @@ gem "google-cloud-bigquery-connection-v1", ">= 1.3.0", "< 1.5"
 gem "google-cloud-data_catalog", path: "../google-cloud-data_catalog"
 gem "google-cloud-storage", path: "../google-cloud-storage"
 gem "google-style", "~> 1.30.1"
+gem "httpclient", "~> 2.8", group: :development
 gem "minitest", "~> 5.16"
 gem "minitest-autotest", "~> 1.0"
 gem "minitest-focus", "~> 1.1"

google-cloud-bigquery/acceptance/bigquery/large_json_test.rb

@@ -0,0 +1,61 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require "bigquery_helper"
+require "securerandom"
+require "json"
+require "httpclient"
+
+describe "BigQuery Large JSON", :bigquery do
+  let(:dataset_id) { "ruby_acceptance_#{SecureRandom.hex(4)}" }
+  let(:dataset) do
+    d = bigquery.dataset dataset_id
+    if d.nil?
+      d = bigquery.create_dataset dataset_id, location: "US"
+    end
+    d
+  end
+  let(:table_id) { "large_json_test_#{SecureRandom.hex(4)}" }
+  let(:table) do
+    t = dataset.table table_id
+    if t.nil?
+      t = dataset.create_table table_id do |schema|
+        schema.string "id", mode: :required
+        schema.json "data", mode: :required
+      end
+    end
+    t
+  end
+
+  after do
+    dataset.delete force: true
+  end
+
+  it "inserts a large JSON object successfully" do
+    # Generate a 8MB JSON object
+    large_string = "a" * (8 * 1024 * 1024)
+    json_data = { "large_string" => large_string }.to_json
+    puts "Generated JSON size: #{json_data.bytesize / (1024 * 1024)} MB"
+
+    row = { "id" => SecureRandom.uuid, "data" => json_data }
+    
+    begin
+      table.insert [row]
+    rescue Google::Cloud::Error => e
+      puts "Google::Cloud::Error encountered: #{e.message}"
+      puts "Error body: #{e.body}"
+      raise
+    end
+  end
+end