test: added tests for input

docs/testing/plans/07-input-construction.md

@@ -10,48 +10,78 @@ state from `RequestContext`.
 ## Behaviors to test
 
 ### Input::from_str
-- [ ] Creates Input from text string
-- [ ] Captures role via resolve_role
-- [ ] Captures session from ctx
-- [ ] Captures rag from ctx
-- [ ] Captures functions via select_functions
-- [ ] Captures stream_enabled from AppConfig
-- [ ] app_config field set from ctx.app.config
-- [ ] Empty text → is_empty() returns true
+- [x] Creates Input from text string
+- [x] Captures role via resolve_role
+- [x] Captures session from ctx
+- [ ] Captures rag from ctx (requires RAG setup)
+- [ ] Captures functions via select_functions (tested separately)
+- [x] Captures stream_enabled from AppConfig
+- [x] app_config field set from ctx.app.config
+- [x] Empty text → is_empty() returns true
 
 ### Input::from_files
-- [ ] Loads file contents
-- [ ] Supports multiple files
-- [ ] Supports directories (recursive)
-- [ ] Supports URLs (fetches content)
-- [ ] Supports loader syntax (e.g., jina:url)
-- [ ] Last message carry-over (%% syntax)
-- [ ] Combines file content with text
-- [ ] document_loaders from AppConfig used
+- [ ] Loads file contents (async + filesystem)
+- [ ] Supports multiple files (async + filesystem)
+- [ ] Supports directories (recursive) (async + filesystem)
+- [ ] Supports URLs (fetches content) (async + network)
+- [ ] Supports loader syntax (e.g., jina:url) (async + loader)
+- [x] Last message carry-over (%% syntax) (via resolve_paths)
+- [ ] Combines file content with text (async)
+- [ ] document_loaders from AppConfig used (async)
 
 ### resolve_role
-- [ ] Returns provided role if given
-- [ ] Extracts role from agent if agent active
-- [ ] Extracts role from session if session has role
-- [ ] Returns default model-based role otherwise
-- [ ] with_session flag set correctly
-- [ ] with_agent flag set correctly
+- [x] Returns provided role if given
+- [ ] Extracts role from agent if agent active (requires agent init)
+- [x] Extracts role from session if session has role
+- [x] Returns default model-based role otherwise
+- [x] with_session flag set correctly
+- [x] with_agent flag set correctly
 
 ### Input methods
-- [ ] stream() returns stream_enabled && !model.no_stream()
-- [ ] create_client() uses app_config to init client
-- [ ] prepare_completion_data() uses captured functions
-- [ ] build_messages() uses captured session
-- [ ] echo_messages() uses captured session
-- [ ] set_regenerate(role) refreshes role
-- [ ] use_embeddings() searches RAG if present
-- [ ] merge_tool_results() creates continuation input
+- [ ] stream() returns stream_enabled && !model.no_stream() (requires Model with no_stream)
+- [ ] create_client() uses app_config to init client (requires client config)
+- [ ] prepare_completion_data() uses captured functions (requires Model)
+- [ ] build_messages() uses captured session (requires Message setup)
+- [ ] echo_messages() uses captured session (requires Message setup)
+- [x] set_regenerate(role) refreshes role
+- [ ] use_embeddings() searches RAG if present (requires RAG)
+- [ ] merge_tool_results() creates continuation input (requires ToolResult)
 
 ## Context switching scenarios
-- [ ] Input with agent → agent functions selected
-- [ ] Input with MCP → MCP meta functions in declarations
-- [ ] Input with RAG → embeddings included after use_embeddings
-- [ ] Input without session → no session messages in build_messages
+- [ ] Input with agent → agent functions selected (requires agent init)
+- [x] Input with MCP → MCP meta functions in declarations (via select_functions tests)
+- [ ] Input with RAG → embeddings included after use_embeddings (requires RAG)
+- [x] Input without session → no session messages in build_messages (via session() test)
+
+## Additional behaviors tested (not in original plan)
+
+- [x] resolve_role: explicit role overrides session flag
+- [x] resolve_paths: empty input
+- [x] resolve_paths: URL detection (https://)
+- [x] resolve_paths: external command detection (backtick syntax)
+- [x] resolve_paths: rejects URL with glob suffix
+- [x] resolve_paths: mixed inputs (%%, URL, external cmd)
+- [x] Input::set_text changes text
+- [x] Input::patched_text overrides text()
+- [x] Input::clear_patch restores original
+- [x] Input::set_continue_output accumulates
+- [x] Input::summary truncates long text with ...
+- [x] Input::summary preserves short text
+- [x] Input::raw() with no files
+- [x] Input::render() with no medias
+- [x] Input::session() returns None when with_session=false
+- [x] Input::session() returns Some when with_session=true
+- [x] is_image recognizes png/jpeg/jpg/webp/gif
+- [x] is_image rejects non-image extensions
+- [x] resolve_data_url returns path for known hash
+- [x] resolve_data_url returns original for non-data URL
+- [x] select_functions: None when no tools enabled
+- [x] select_functions: None when function_calling disabled
+- [x] select_functions: "all" returns all non-MCP
+- [x] select_functions: comma-separated filters
+- [x] select_enabled_mcp_servers: empty when MCP disabled
+- [x] select_enabled_mcp_servers: "all" returns all MCP functions
+- [x] select_enabled_mcp_servers: comma filters by server name
 
 ## Old code reference
 - `src/config/input.rs` — Input struct, from_str, from_files