[Future Request] go-vcr testing

[MSevey]

Use go-vcr for Recording and Replaying HTTP Interactions

Something we might want to consider in the future is using something like go-vcr to record the actual http API interactions with the providers to use for tests.

This is something we should come back to after the initial MVP once the API is more stable. Until then, this would probably slow down development more than it would help.

This approach uses go-vcr to record actual API interactions and replay them during tests.

High-Level Tasks:

1. Add go-vcr as a dependency
2. Create test fixtures by recording actual API interactions
3. Modify tests to use recorded interactions
4. Add configuration to allow switching between recorded and live modes
5. Add new tests for error handling and edge cases

Example Implementation:

func TestDigitalOceanProvider_CreateInstance(t *testing.T) {
    // Create a new recorder
    recorder, err := vcr.New("fixtures/create_instance")
    require.NoError(t, err)
    defer recorder.Stop()

    // Create a custom HTTP client using the recorder
    httpClient := &http.Client{
        Transport: recorder,
    }

    // Create a new DigitalOcean client using the custom HTTP client
    doClient := godo.NewClient(httpClient)
    
    // Create a provider with the custom client
    provider := &DigitalOceanProvider{
        doClient: doClient,
    }

    // Run the test
    // ...
}

Pros:

• Tests run against actual API responses
• No need to create mock implementations
• Tests can run without actual API credentials after recording

Cons:

• Initial setup requires actual API credentials
• Recorded fixtures may become outdated if API changes
• More complex setup than simple mocking