feat: move the terminal fully into the ssh-terminal plugin (B9)

plugins/ssh-terminal/tests/frontend/lib/terminal-local-echo.test.ts

@@ -0,0 +1,70 @@
+import { describe, expect, it } from "vitest";
+import {
+  TerminalLocalEcho,
+  resolveLocalEchoMode,
+} from "../../../src/frontend/lib/terminal-local-echo";
+
+describe("TerminalLocalEcho", () => {
+  it("renders immediately and suppresses the matching remote echo", () => {
+    const echo = new TerminalLocalEcho("on");
+    expect(echo.handleInput("a")).toBe("a");
+    expect(echo.handleOutput("a")).toBe("");
+  });
+
+  it("rolls back a prediction when remote output differs", () => {
+    const echo = new TerminalLocalEcho("on");
+    echo.handleInput("a");
+    expect(echo.handleOutput("z")).toBe("\x1b[1D\x1b[1Xz");
+  });
+
+  it("only erases the predicted cells during rollback", () => {
+    const echo = new TerminalLocalEcho("on");
+    echo.handleInput("a");
+    echo.handleInput("b");
+    expect(echo.handleOutput("\x1b[C")).toBe("\x1b[2D\x1b[2X\x1b[C");
+  });
+
+  it.each([
+    ["split prompt", ["Pass", "word: "]],
+    ["sudo prompt", ["[sudo] password for alice: "]],
+    ["ssh-keygen prompt", ["Enter passphrase (empty for no passphrase): "]],
+    ["passwd prompt", ["New password: "]],
+  ])("does not expose input after a %s", (_name, chunks) => {
+    const echo = new TerminalLocalEcho("on");
+    for (const chunk of chunks) expect(echo.handleOutput(chunk)).toBe(chunk);
+    expect(echo.handleInput("s")).toBe("");
+  });
+
+  it("does not treat ordinary password text as a hidden-input prompt", () => {
+    const echo = new TerminalLocalEcho("on");
+    expect(echo.handleOutput("Your password has expired\r\n$ ")).toBe(
+      "Your password has expired\r\n$ ",
+    );
+    expect(echo.handleInput("s")).toBe("s");
+  });
+
+  it("does not predict control input, paste, or wide characters", () => {
+    const echo = new TerminalLocalEcho("on");
+    expect(echo.handleInput("\t")).toBe("");
+    expect(echo.handleInput("paste")).toBe("");
+    expect(echo.handleInput("界")).toBe("");
+  });
+
+  it("enables automatic prediction after repeated slow echoes", () => {
+    let now = 0;
+    const echo = new TerminalLocalEcho("auto", () => now, 100);
+    expect(echo.handleInput("a")).toBe("");
+    now = 150;
+    expect(echo.handleOutput("a")).toBe("a");
+    expect(echo.handleInput("b")).toBe("");
+    now = 300;
+    expect(echo.handleOutput("b")).toBe("b");
+    expect(echo.handleInput("c")).toBe("c");
+  });
+
+  it("uses an explicit host mode before the global mode", () => {
+    expect(resolveLocalEchoMode("off", "on")).toBe("off");
+    expect(resolveLocalEchoMode("default", "on")).toBe("on");
+    expect(resolveLocalEchoMode(undefined, null)).toBe("auto");
+  });
+});