LangBot/web/tests/unit/install-progress.test.mjs

import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import test from 'node:test';
import { createRequire } from 'node:module';
import { fileURLToPath } from 'node:url';
import ts from 'typescript';

const currentDirectory = path.dirname(fileURLToPath(import.meta.url));
const sourcePath = path.resolve(
  currentDirectory,
  '../../src/app/home/plugins/components/plugin-install-task/install-progress.ts',
);
const source = fs.readFileSync(sourcePath, 'utf8');
const compiled = ts.transpileModule(source, {
  compilerOptions: { module: ts.ModuleKind.CommonJS },
}).outputText;
const sourceRequire = createRequire(sourcePath);
const loadedModule = { exports: {} };
new Function('require', 'module', 'exports', compiled)(
  sourceRequire,
  loadedModule,
  loadedModule.exports,
);

const {
  InstallStage,
  INSTALL_PROGRESS_CAP,
  STAGE_PROGRESS_RANGE,
  computeStageProgress,
  mapActionToStage,
} = loadedModule.exports;

test('maps the connector stage strings the runtime actually emits', () => {
  assert.equal(
    mapActionToStage('preparing plugin install'),
    InstallStage.DOWNLOADING,
    '"preparing plugin install" must not be read as the dependency stage',
  );
  assert.equal(
    mapActionToStage('downloading plugin package'),
    InstallStage.DOWNLOADING,
  );
  assert.equal(
    mapActionToStage('inspecting plugin package'),
    InstallStage.INSTALLING_DEPS,
  );
  assert.equal(
    mapActionToStage('storing plugin package'),
    InstallStage.INSTALLING_DEPS,
  );
  assert.equal(
    mapActionToStage('persisting the installation'),
    InstallStage.INSTALLING_DEPS,
  );
  assert.equal(mapActionToStage('launching plugin'), InstallStage.LAUNCHING);
  assert.equal(
    mapActionToStage('waiting for plugin to become ready'),
    InstallStage.LAUNCHING,
    'the readiness wait is still an active stage, not completion',
  );
});

test('the combined install-and-start stage is not reported as launching', () => {
  // The runtime installs dependencies and starts the plugin in one step; the
  // wording contains "starting" and must not be mapped to the launch stage.
  assert.equal(
    mapActionToStage('installing or starting plugin'),
    InstallStage.INSTALLING_DEPS,
  );
});

test('measured byte counts stay inside the download stage range', () => {
  const [start, end] = STAGE_PROGRESS_RANGE[InstallStage.DOWNLOADING];

  // 90 of 100 bytes is 90% of the download range, even after 40s elapsed.
  const progress = computeStageProgress({
    stage: InstallStage.DOWNLOADING,
    downloadCurrent: 90,
    downloadTotal: 100,
    stageElapsedSeconds: 40,
  });

  assert.ok(
    progress >= start && progress <= end,
    `expected progress within [${start}, ${end}], received ${progress}`,
  );
  assert.equal(
    progress,
    41,
    'drift must not be layered on top of a measured byte ratio',
  );
});

test('fallback drift never spills into the next stage range', () => {
  for (const stage of [
    InstallStage.DOWNLOADING,
    InstallStage.INSTALLING_DEPS,
    InstallStage.INITIALIZING,
    InstallStage.LAUNCHING,
  ]) {
    const [start, end] = STAGE_PROGRESS_RANGE[stage];
    const progress = computeStageProgress({
      stage,
      stageElapsedSeconds: 100000,
    });

    assert.ok(
      progress >= start && progress <= end,
      `stage ${stage} produced ${progress}, outside [${start}, ${end}]`,
    );
    assert.ok(
      progress < INSTALL_PROGRESS_CAP,
      `stage ${stage} must not reach the completion cap on drift alone`,
    );
  }
});

test('a missing or zero download total falls back to bounded drift', () => {
  const [start, end] = STAGE_PROGRESS_RANGE[InstallStage.DOWNLOADING];

  const progress = computeStageProgress({
    stage: InstallStage.DOWNLOADING,
    downloadCurrent: 10,
    downloadTotal: 0,
    stageElapsedSeconds: 100000,
  });

  assert.ok(
    progress >= start && progress <= end,
    `expected progress within [${start}, ${end}], received ${progress}`,
  );
});