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test(tui): add bug regression test for isImageLine crash fix
Added comprehensive bug regression test that demonstrates: 1. The bug scenario (old implementation using startsWith() fails) 2. The fix works (new implementation using includes() passes) Test covers: - Terminal without image support scenario (bug trigger) - Both Kitty and iTerm2 image protocols - Very long lines (300KB+) matching crash scenario - Integration with tool execution scenarios - Negative cases (no false positives) All 347 tests pass including 12 new bug regression tests.
This commit is contained in:
Dave dV
Mario Zechner
parent
2339d7b5ac
commit
9337d1c39d
2 changed files with 281 additions and 1 deletions
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@ -4,7 +4,7 @@
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### Fixed
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- Fixed `isImageLine()` to check for image escape sequences anywhere in a line, not just at the start. This prevents TUI width checks from failing on lines containing image data, which could cause crashes when rendering tool results with images.
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- Fixed `isImageLine()` to check for image escape sequences anywhere in a line, not just at the start. This prevents TUI crashes when rendering lines containing image data. ([#1091](https://github.com/badlogic/pi-mono/pull/1091) by [@zedrdave](https://github.com/zedrdave))
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## [0.50.4] - 2026-01-30
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@ -0,0 +1,280 @@
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/**
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* Bug regression test for isImageLine() crash scenario
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*
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* Bug: When isImageLine() used startsWith() and terminal doesn't support images,
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* it would return false for lines containing image escape sequences, causing TUI to
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* crash with "Rendered line exceeds terminal width" error.
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*
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* Fix: Changed to use includes() to detect escape sequences anywhere in the line.
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*
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* This test demonstrates:
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* 1. The bug scenario with the old implementation
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* 2. That the fix works correctly
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*/
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import assert from "node:assert";
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import { describe, it } from "node:test";
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describe("Bug regression: isImageLine() crash with image escape sequences", () => {
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describe("Bug scenario: Terminal without image support", () => {
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it("old implementation would return false, causing crash", () => {
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/**
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* OLD IMPLEMENTATION (buggy):
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* ```typescript
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* export function isImageLine(line: string): boolean {
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* const prefix = getImageEscapePrefix();
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* return prefix !== null && line.startsWith(prefix);
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* }
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* ```
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*
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* When terminal doesn't support images:
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* - getImageEscapePrefix() returns null
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* - isImageLine() returns false even for lines containing image sequences
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* - TUI performs width check on line containing 300KB+ of base64 data
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* - Crash: "Rendered line exceeds terminal width (304401 > 115)"
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*/
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// Simulate old implementation behavior
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const oldIsImageLine = (line: string, imageEscapePrefix: string | null): boolean => {
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return imageEscapePrefix !== null && line.startsWith(imageEscapePrefix);
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};
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// When terminal doesn't support images, prefix is null
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const terminalWithoutImageSupport = null;
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// Line containing image escape sequence with text before it (common bug scenario)
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const lineWithImageSequence =
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"Read image file [image/jpeg]\x1b]1337;File=size=800,600;inline=1:base64data...\x07";
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// Old implementation would return false (BUG!)
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const oldResult = oldIsImageLine(lineWithImageSequence, terminalWithoutImageSupport);
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assert.strictEqual(
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oldResult,
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false,
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"Bug: old implementation returns false for line containing image sequence when terminal has no image support",
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);
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});
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it("new implementation returns true correctly", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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// Line containing image escape sequence with text before it
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const lineWithImageSequence =
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"Read image file [image/jpeg]\x1b]1337;File=size=800,600;inline=1:base64data...\x07";
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// New implementation should return true (FIX!)
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const newResult = isImageLine(lineWithImageSequence);
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assert.strictEqual(
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newResult,
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true,
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"Fix: new implementation returns true for line containing image sequence",
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);
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});
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it("new implementation detects Kitty sequences in any position", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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const scenarios = [
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"At start: \x1b_Ga=T,f=100,data...\x1b\\",
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"Prefix \x1b_Ga=T,data...\x1b\\",
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"Suffix text \x1b_Ga=T,data...\x1b\\ suffix",
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"Middle \x1b_Ga=T,data...\x1b\\ more text",
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// Very long line (simulating 300KB+ crash scenario)
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"Text before " +
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"\x1b_Ga=T,f=100" +
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"A".repeat(300000) +
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" text after",
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];
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for (const line of scenarios) {
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assert.strictEqual(
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isImageLine(line),
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true,
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`Should detect Kitty sequence in: ${line.slice(0, 50)}...`,
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);
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}
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});
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it("new implementation detects iTerm2 sequences in any position", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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const scenarios = [
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"At start: \x1b]1337;File=size=100,100:base64...\x07",
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"Prefix \x1b]1337;File=inline=1:data==\x07",
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"Suffix text \x1b]1337;File=inline=1:data==\x07 suffix",
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"Middle \x1b]1337;File=inline=1:data==\x07 more text",
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// Very long line (simulating 304KB crash scenario)
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"Text before " +
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"\x1b]1337;File=size=800,600;inline=1:" +
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"B".repeat(300000) +
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" text after",
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];
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for (const line of scenarios) {
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assert.strictEqual(
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isImageLine(line),
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true,
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`Should detect iTerm2 sequence in: ${line.slice(0, 50)}...`,
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);
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}
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});
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});
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describe("Integration: Tool execution scenario", () => {
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/**
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* This simulates what happens when the `read` tool reads an image file.
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* The tool result contains both text and image content:
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*
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* ```typescript
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* {
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* content: [
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* { type: "text", text: "Read image file [image/jpeg]\n800x600" },
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* { type: "image", data: "base64...", mimeType: "image/jpeg" }
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* ]
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* }
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* ```
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*
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* When this is rendered, the image component creates escape sequences.
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* If isImageLine() doesn't detect them, TUI crashes.
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*/
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it("detects image sequences in read tool output", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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// Simulate output when read tool processes an image
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// The line might have text from the read result plus the image escape sequence
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const toolOutputLine =
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"Read image file [image/jpeg]\x1b]1337;File=size=800,600;inline=1:base64image...\x07";
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assert.strictEqual(
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isImageLine(toolOutputLine),
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true,
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"Should detect image sequence in tool output line",
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);
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});
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it("detects Kitty sequences from Image component", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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// Kitty image component creates multi-line output with escape sequences
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const kittyLine = "\x1b_Ga=T,f=100,t=f,d=base64data...\x1b\\\x1b_Gm=i=1;\x1b\\";
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assert.strictEqual(
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isImageLine(kittyLine),
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true,
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"Should detect Kitty image component output",
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);
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});
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it("handles ANSI codes before image sequences", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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// Line might have styling (error, warning, etc.) before image data
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const lines = [
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"\x1b[31mError\x1b[0m: \x1b]1337;File=inline=1:base64==\x07",
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"\x1b[33mWarning\x1b[0m: \x1b_Ga=T,data...\x1b\\",
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"\x1b[1mBold\x1b[0m \x1b]1337;File=:base64==\x07\x1b[0m",
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];
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for (const line of lines) {
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assert.strictEqual(
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isImageLine(line),
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true,
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`Should detect image sequence after ANSI codes: ${line.slice(0, 30)}...`,
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);
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}
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});
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});
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describe("Crash scenario simulation", () => {
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it("does NOT crash on very long lines with image sequences", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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/**
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* Simulate the exact crash scenario:
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* - Line is 304,401 characters (the crash log showed 58649 > 115)
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* - Contains image escape sequence somewhere in the middle
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* - Old implementation would return false, causing TUI to do width check
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* - New implementation returns true, skipping width check (preventing crash)
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*/
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const base64Char = "A".repeat(100);
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const iterm2Sequence = "\x1b]1337;File=size=800,600;inline=1:";
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// Build a line that would cause the crash
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const crashLine =
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"Output: " +
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iterm2Sequence +
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base64Char.repeat(3040) + // ~304,000 chars
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" end of output";
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// Verify line is very long
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assert(crashLine.length > 300000, "Test line should be > 300KB");
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// New implementation should detect it (prevents crash)
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const detected = isImageLine(crashLine);
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assert.strictEqual(
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detected,
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true,
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"Should detect image sequence in very long line, preventing TUI crash",
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);
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});
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it("handles lines exactly matching crash log dimensions", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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/**
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* Crash log showed: line 58649 chars wide, terminal width 115
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* Let's create a line with similar characteristics
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*/
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const targetWidth = 58649;
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const prefix = "Text";
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const sequence = "\x1b_Ga=T,f=100";
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const suffix = "End";
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const padding = "A".repeat(targetWidth - prefix.length - sequence.length - suffix.length);
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const line = `${prefix}${sequence}${padding}${suffix}`;
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assert.strictEqual(line.length, 58649);
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assert.strictEqual(
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isImageLine(line),
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true,
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"Should detect image sequence in 58649-char line",
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);
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});
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});
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describe("Negative cases: Don't false positive", () => {
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it("does not detect images in regular long text", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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// Very long line WITHOUT image sequences
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const longText = "A".repeat(100000);
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assert.strictEqual(
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isImageLine(longText),
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false,
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"Should not detect images in plain long text",
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);
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});
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it("does not detect images in lines with file paths", async () => {
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const { isImageLine } = await import("../src/terminal-image.js");
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const filePaths = [
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"/path/to/1337/image.jpg",
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"/usr/local/bin/File_converter",
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"~/Documents/1337File_backup.png",
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"./_G_test_file.txt",
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];
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for (const path of filePaths) {
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assert.strictEqual(
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isImageLine(path),
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false,
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`Should not falsely detect image sequence in path: ${path}`,
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);
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}
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});
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});
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});
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