Summary

Establishes foundational test coverage for pgrsql, addressing the testing strategy outlined in #8. Adds 124 unit tests across all 6 existing source modules using inline #[cfg(test)] modules.

Test Coverage by Module

src/editor/buffer.rs — 50 tests

• Construction: new(), Default, from_text() (empty, single-line, multi-line)
• Text retrieval: text(), current_line(), line_count()
• Insertion: single char, mid-line, newline, multiline text, tab, replaces selection
• Deletion: backspace (middle, line-merge, beginning edge), delete (middle, line-merge, end edge), with selection
• Cursor movement: left/right (with line wrapping), up/down (with clamping), line start/end, document start/end
• Word movement: word-left, word-right, across line boundaries
• Selection: start/get, same-line and multi-line text, select all, select line, delete selection
• Utilities: clear, set_text, text round-trip, ensure_cursor_visible (scroll up/down)

src/editor/history.rs — 20 tests

• Storage: add entry, consecutive duplicate prevention, whitespace-trimmed dedup, non-consecutive duplicates allowed, max entries trimming
• Navigation: previous (returns last, navigates backward, stops at first), next (navigates forward, stops at last, returns None without prior previous), reset navigation, add resets navigation
• Search: case-insensitive substring matching, no results
• Serialization: serde_json round-trip

src/ui/theme.rs — 20 tests

• Theme construction: dark theme (RGB < 50), light theme (RGB > 200), default is dark
• Style helpers: normal style, header is bold, border focused vs unfocused, status styles (success/error/warning)
• SQL keyword detection: case-insensitive matching, non-keywords rejected, DML/DDL/window/CTE categories
• SQL type detection: case-insensitive matching, non-types rejected
• List integrity: all keywords uppercase, all types uppercase, no duplicate keywords, no duplicate types

src/db/connection.rs — 18 tests

• ConnectionConfig: default values, connection string generation, display string, special character escaping, all SSL modes
• AWS RDS: host detection (positive/negative), auto-detect certs, explicit certs
• ConnectionManager: construction
• Utilities: quote_conn_value(), base64 decoding (with padding, without, with newlines)
• Serialization: TOML round-trip, password skip_serializing

src/db/query.rs — 12 tests

• CellValue display: Null, Bool, Int16/32/64, Float32/64, Text, Bytes, Json, Array, Unknown
• CellValue display_width: width calculations
• QueryResult: empty constructor, error constructor

src/db/schema.rs — 8 tests

• TableType: icon() and label() for all 4 variants, equality
• Clone: DatabaseInfo, SchemaInfo, TableInfo
• Construction: ColumnDetails, IndexInfo

Design Decisions

• Inline #[cfg(test)] modules — tests live alongside the code they test, following Rust convention
• No database required — all tests are pure unit tests that don't require a running PostgreSQL instance
• Zero dependencies added — tests use only existing crate dependencies (chrono, serde_json, etc.)
• Zero clippy warnings — all tests pass cargo clippy cleanly

Test Results

test result: ok. 124 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

Test plan

• cargo test — 124 tests pass
• cargo clippy — zero warnings
• cargo fmt — properly formatted

Closes #8

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