1. 1. Architecture: The key difference between Cucumber and Google Test lies in their architecture. Cucumber follows a behavior-driven development approach, utilizing a domain-specific language (DSL) called Gherkin to write high-level acceptance tests in a human-readable format. On the other hand, Google Test is a testing framework for C++ that follows a traditional unit testing approach, focusing on writing and executing low-level tests for individual components.

2. 2. Language Compatibility: Cucumber primarily targets testing the behavior of software written in multiple programming languages, including Ruby, Java, JavaScript, etc. It can interact with the system under test using various automation frameworks. In contrast, Google Test is specifically designed for testing C++ code and does not provide direct support for testing other programming languages.

3. 3. Test Organization: Cucumber organizes tests in a hierarchical structure known as features, scenarios, and steps. Features represent high-level functionalities while scenarios define specific test cases. Steps are the individual actions or assertions inside each scenario. Google Test, on the other hand, organizes tests into test cases and test suites, focusing on organizing and executing low-level unit tests.

4. 4. Test Execution: Cucumber tests are typically executed using a separate test runner, such as Cucumber.js or Cucumber-JVM, which interprets the Gherkin syntax and orchestrates the execution of step definitions. Google Test, however, provides its own test runner, which can be used to execute the C++ unit tests without the need for additional frameworks.

5. 5. Test Output: Cucumber produces test results in a textual format, usually in the form of reports or logs that highlight the passed or failed scenarios and steps. It emphasizes clear communication of the test's intent and behavior. In contrast, Google Test provides a detailed output in both a human-readable format and an XML format, including information on test failures, test durations, and other metrics.

6. 6. Test Double Integration: Cucumber supports the integration of various test doubles, such as mocks and stubs, to simulate dependencies in the system under test. This enables behavior verification and isolation of units for testing. Google Test also supports test doubles through its mocking framework, Google Mock, allowing developers to create mocks and partial mocks for testing C++ classes.

In Summary, Cucumber focuses on behavior-driven development, while Google Test is dedicated to unit testing C++ code. Cucumber is language-agnostic, compatible with multiple programming languages, and emphasizes test organization in features and scenarios. On the other hand, Google Test is specific to C++, provides its own test runner, and offers detailed test output and test double integration through Google Mock.