build: Add helpers

[stanleyjones]

Okay, take 2 of #114 . Just adding the JSON helper this time.

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[stanleyjones]

❯ npm run test:e2e

> alberto@0.1.0-alpha.9 test:e2e
> npx playwright test --config=./e2e/playwright.config.ts

Running 55 tests using 10 workers

  ✓  [pixel-5] › tests/accounts.spec.ts:52:1 › submit, approve, revoke, and execute a multisig transaction (1m)
  ✓  [webkit] › tests/home.spec.ts:19:1 › send tokens (24s)
  ✓  [iphone12-promax] › tests/accounts.spec.ts:52:1 › submit, approve, revoke, and execute a multisig transaction (1m)
  ✓  [firefox] › tests/accounts.spec.ts:52:1 › submit, approve, revoke, and execute a multisig transaction (1m)
  ✓  [chromium] › tests/home.spec.ts:19:1 › send tokens (21s)
  ✓  [iphone12-promax] › tests/home.spec.ts:19:1 › send tokens (20s)
  ✓  [firefox] › tests/home.spec.ts:19:1 › send tokens (20s)
  ✓  [chromium] › tests/accounts.spec.ts:52:1 › submit, approve, revoke, and execute a multisig transaction (1m)
  ✓  [webkit] › tests/accounts.spec.ts:52:1 › submit, approve, revoke, and execute a multisig transaction (1m)
  ✓  [pixel-5] › tests/home.spec.ts:19:1 › send tokens (19s)
  ✓  [pixel-5] › tests/home.spec.ts:42:1 › edit wallet name (17s)
  ✓  [firefox] › tests/home.spec.ts:42:1 › edit wallet name (8s)
  ✓  [iphone12-promax] › tests/home.spec.ts:42:1 › edit wallet name (13s)
  ✓  [chromium] › tests/home.spec.ts:42:1 › edit wallet name (8s)
  ✓  [webkit] › tests/home.spec.ts:42:1 › edit wallet name (8s)
  ✓  [firefox] › tests/home.spec.ts:54:1 › remove wallet (7s)
  ✓  [chromium] › tests/home.spec.ts:54:1 › remove wallet (8s)
  ✓  [webkit] › tests/home.spec.ts:54:1 › remove wallet (8s)
  ✓  [iphone12-promax] › tests/home.spec.ts:54:1 › remove wallet (13s)
  ✓  [firefox] › tests/home.spec.ts:71:1 › add a network (8s)
  ✓  [pixel-5] › tests/home.spec.ts:54:1 › remove wallet (16s)
  ✓  [chromium] › tests/home.spec.ts:71:1 › add a network (8s)
  ✓  [webkit] › tests/home.spec.ts:71:1 › add a network (8s)
  ✓  [firefox] › tests/home.spec.ts:82:1 › edit a network (7s)
  ✓  [chromium] › tests/home.spec.ts:82:1 › edit a network (8s)
  ✓  [iphone12-promax] › tests/home.spec.ts:71:1 › add a network (16s)
  ✓  [webkit] › tests/home.spec.ts:82:1 › edit a network (8s)
  ✓  [firefox] › tests/home.spec.ts:92:1 › remove a network (7s)
  ✓  [pixel-5] › tests/home.spec.ts:71:1 › add a network (16s)
  ✓  [chromium] › tests/home.spec.ts:92:1 › remove a network (8s)
  ✓  [webkit] › tests/home.spec.ts:92:1 › remove a network (8s)
  ✓  [iphone12-promax] › tests/home.spec.ts:82:1 › edit a network (16s)
  ✓  [pixel-5] › tests/home.spec.ts:82:1 › edit a network (16s)
  ✓  [firefox] › tests/accounts.spec.ts:98:1 › cannot modify multisig settings per transaction (33s)
  ✓  [chromium] › tests/accounts.spec.ts:98:1 › cannot modify multisig settings per transaction (29s)
  ✓  [webkit] › tests/accounts.spec.ts:98:1 › cannot modify multisig settings per transaction (28s)
  ✓  [iphone12-promax] › tests/home.spec.ts:92:1 › remove a network (16s)
  ✓  [iphone12-promax] › tests/accounts.spec.ts:98:1 › cannot modify multisig settings per transaction (33s)
  ✓  [pixel-5] › tests/accounts.spec.ts:98:1 › cannot modify multisig settings per transaction (35s)
  ✓  [pixel-5] › tests/home.spec.ts:92:1 › remove a network (16s)
  ✓  [webkit] › tests/accounts.spec.ts:135:1 › disallow submitting multisig transaction (39s)
  ✓  [chromium] › tests/accounts.spec.ts:135:1 › disallow submitting multisig transaction (40s)
  ✓  [firefox] › tests/accounts.spec.ts:135:1 › disallow submitting multisig transaction (38s)
  ✓  [iphone12-promax] › tests/accounts.spec.ts:135:1 › disallow submitting multisig transaction (49s)
  ✓  [pixel-5] › tests/accounts.spec.ts:135:1 › disallow submitting multisig transaction (46s)
  ✓  [webkit] › tests/accounts.spec.ts:156:1 › modify multisig settings (40s)
  ✓  [firefox] › tests/accounts.spec.ts:156:1 › modify multisig settings (40s)
  ✓  [chromium] › tests/accounts.spec.ts:156:1 › modify multisig settings (39s)
  ✓  [pixel-5] › tests/accounts.spec.ts:156:1 › modify multisig settings (50s)
  ✓  [iphone12-promax] › tests/accounts.spec.ts:156:1 › modify multisig settings (50s)
  ✓  [webkit] › tests/accounts.spec.ts:178:1 › add and remove owner (49s)
  ✓  [chromium] › tests/accounts.spec.ts:178:1 › add and remove owner (52s)
  ✓  [firefox] › tests/accounts.spec.ts:178:1 › add and remove owner (49s)
  ✓  [pixel-5] › tests/accounts.spec.ts:178:1 › add and remove owner (60s)
  ✓  [iphone12-promax] › tests/accounts.spec.ts:178:1 › add and remove owner (1m)

  Slow test file: [iphone12-promax] › tests/accounts.spec.ts (5m)
  Slow test file: [pixel-5] › tests/accounts.spec.ts (5m)
  Slow test file: [chromium] › tests/accounts.spec.ts (4m)
  Slow test file: [webkit] › tests/accounts.spec.ts (4m)
  Slow test file: [firefox] › tests/accounts.spec.ts (4m)
  Consider splitting slow test files to speed up parallel execution

  55 passed (5m)

CI and end-to-end tests pass.