testABranchOnlyReadChangesNothing

tcmts.store.test.history.testABranchOnlyReadChangesNothing · #i2xuohbb · term

A branch only read (--branch) is what the store reads, text versions and all, and nothing changes any branch: names, text versions, history, todo, patches and branches stay as they were.

import { a, b, open, stored } from "#codebase/tcmts/store/test/history";
import assert from "node:assert/strict";

export const testABranchOnlyReadChangesNothing = () => {
  const s = open();
  s.putDefs([stored(a, "const f = 1", "One."), stored(b, "const g = 2")], "5", 2);
  s.addName("f", a, "term", "add");
  s.endBatch();
  s.createBranch("side");
  s.switchBranch("side");
  s.addName("g", b, "term", "add");
  s.setText(
    { hash: a, sourceText: "const f = 1 // one", spans: [], reservedNames: [], doc: "Uno." },
    "update",
  );
  s.endBatch();
  s.switchBranch("main");
  const heads = s.branches().map((n) => s.head(n));

  s.readOnly("side");
  assert.equal(s.branch().name, "side");
  assert.deepEqual(
    s.names().map((n) => n.path),
    ["f", "g"],
  );
  assert.equal(s.getDef(a)!.doc, "Uno.");
  assert.equal(s.history(1)[0]?.command, "update");

  const refused = /side is only read here \(--branch\)/;
  assert.throws(() => s.addName("h", b, "term", "add"), refused);
  assert.throws(() => s.removeName("g", b, "rm"), refused);
  assert.throws(
    () => s.setText({ hash: a, sourceText: "const f = 1", spans: [], reservedNames: [] }, "update"),
    refused,
  );
  assert.throws(() => s.setTodo(a, "broken"), refused);
  assert.throws(() => s.addPatch(a, b), refused);
  assert.throws(() => s.createBranch("other"), refused);
  assert.throws(() => s.switchBranch("main"), refused);
  assert.throws(() => s.setBranchNames("main", [], "reset"), refused);
  assert.deepEqual(
    s.names().map((n) => n.path),
    ["f", "g"],
  );
  assert.deepEqual(
    s.names("main").map((n) => n.path),
    ["f"],
  );
  assert.deepEqual(
    s.branches().map((n) => s.head(n)),
    heads,
  );
  assert.equal(s.todos().length, 0);
  assert.throws(() => s.readOnly("nope"), /no branch named 'nope' \(--branch\)/);
}

testABranchOnlyReadChangesNothing

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