[devin-ai-integration]

Summary

Adds the missing non-pricy unit test for the visual agent's prompt module. MainPrompt._parse_answer merges think.parse_answer and action_prompt.parse_answer into one dict; nothing asserted that both survive the merge, so a key change or collision in either sub-parser would silently drop the thought or the action.

New tests/agents/test_visual_agent_prompt.py builds a real MainPrompt from DEFAULT_PROMPT_FLAGS and asserts:

• both think and action are present and correct for a well-formed answer;
• with use_thinking=False, the invisible Think element contributes nothing ("think" not in ans_dict) while action still parses;
• a missing <think> tag surfaces parse_error (Think's non-raising fallback) rather than being swallowed.

Runs without a MiniWoB server or any LLM call.

Devin-Org: engineering

Link to Devin session: https://app.devin.ai/sessions/627e197fd9264cb3aad32f13e728016d
Open in Devin Desktop: https://app.devin.ai/desktop/session/627e197fd9264cb3aad32f13e728016d?variant=devin

[devin-ai-integration]

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