Explain grammar labels in plain English on original words and in word-study cards

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/utils/grammar.test.js

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+import { test, expect } from 'vitest';
+import { grammarNotes } from './grammar.js';
+
+const terms = (label) => grammarNotes(label).map((n) => n.term);
+
+test('a Greek verb is explained part by part', () => {
+  const notes = grammarNotes('Verb - Aorist Indicative Active - 3rd Person Singular');
+  expect(notes.map((n) => n.term)).toEqual(['Verb', 'Aorist', 'Indicative', 'Active', '3rd person singular']);
+  expect(notes.find((n) => n.term === 'Aorist').meaning).toMatch(/as a whole/);
+  expect(notes.at(-1).meaning).toBe('he / she / it / they (one).');
+});
+
+test('nouns and articles give their case', () => {
+  expect(terms('Noun - Nominative Masculine Singular')).toEqual(['Noun', 'Nominative']);
+  expect(terms('Article - Genitive Neuter Plural')).toEqual(['Article', 'Genitive']);
+  expect(terms('Personal / Relative Pronoun - Accusative 1st Person Singular')).toContain('Accusative');
+});
+
+test('moods, participles and voices that share words are not double counted', () => {
+  expect(terms('Verb - Present Participle Middle or Passive - Nominative Masculine Singular')).toEqual(['Verb', 'Present', 'Participle', 'Middle or passive', 'Nominative']);
+  expect(terms('Verb - Perfect Infinitive Active')).toEqual(['Verb', 'Perfect', 'Infinitive', 'Active']);
+});
+
+test('a Hebrew verb is read with Hebrew meanings, not Greek ones', () => {
+  const notes = grammarNotes('Verb - Qal - Perfect - third person masculine singular');
+  expect(notes.map((n) => n.term)).toEqual(['Verb', 'Qal', 'Perfect', 'Third person singular']);
+  expect(notes.find((n) => n.term === 'Perfect').meaning).toMatch(/complete/);
+  expect(grammarNotes('Verb - Hiphil - Imperfect - third person masculine singular').find((n) => n.term === 'Hiphil').meaning).toMatch(/Causing/);
+});
+
+test('Hebrew words with attached prefixes explain the prefix', () => {
+  const notes = grammarNotes('Preposition-b | Noun - feminine singular');
+  expect(notes.map((n) => n.term)).toEqual(expect.arrayContaining(['Noun', 'Preposition-b']));
+  expect(notes.find((n) => n.term === 'Preposition-b').meaning).toMatch(/joined to the front/);
+});
+
+test('nothing to explain gives an empty list', () => {
+  expect(grammarNotes('')).toEqual([]);
+  expect(grammarNotes(null)).toEqual([]);
+  expect(grammarNotes('???')).toEqual([]);
+});