Simpl-Resultat/src/utils/bankSignatures.test.ts

// Bank signatures and format drift (#330).
//
// Two contracts are frozen here.
//
// THE SIGNATURES. Each of the four banks has a fixture carrying its documented
// header layout. The test that matters is not "the signature matches" — it is
// the pair: the same file WITH its bank header and WITHOUT it. Three of the
// four layouts are read wrong by the generic dictionary, and the counterfactual
// is what proves the signature earns its place instead of merely agreeing with
// the heuristic. The other half of that pair is the fall-back: every fixture of
// the #326 corpus must still be detected with no bank at all.
//
// THE DRIFT. `header_signature` records the labels of the last successful
// import; a later file whose header normalizes differently is drift. The
// interesting cases are the ones that must NOT fire: no stored signature, a
// headerless file, a stored value that will not parse, and a cosmetic rename
// (`Montant` -> `MONTANT ($)`) that normalizes to the same label.

import { describe, it, expect } from "vitest";
import { readFileSync } from "fs";
import { resolve } from "path";
import {
  BANK_SIGNATURES,
  MIN_SIGNATURE_LABELS,
  bankSignatureById,
  buildHeaderSignature,
  detectHeaderDrift,
  matchBankSignature,
  parseHeaderSignature,
  type BankSignatureId,
} from "./bankSignatures";
import { normalizeHeaderCell } from "./headerDictionary";
import { detectImportFormat } from "./csvAutoDetect";
import { CSV_FIXTURE_NAMES, readCsvFixture } from "../__fixtures__/csv";
import fr from "../i18n/locales/fr.json";
import en from "../i18n/locales/en.json";

/** The bank a file is recognised as, or null. Throws on a file detection refuses. */
function bankOf(content: string): BankSignatureId | null {
  const outcome = detectImportFormat(content);
  if (outcome.status !== "ok") {
    throw new Error(`detection returned ${outcome.status}`);
  }
  return outcome.bank;
}

/** The configuration detection settles on. Throws on a file it refuses. */
function configOf(content: string) {
  const outcome = detectImportFormat(content);
  if (outcome.status !== "ok") {
    throw new Error(`detection returned ${outcome.status}`);
  }
  return outcome.config;
}

/** The same file with its header row replaced — every data row untouched. */
function withHeader(raw: string, header: string): string {
  const lines = raw.split("\n");
  lines[0] = header;
  return lines.join("\n");
}

describe("the signature table is well formed (#330)", () => {
  it("gives every bank a distinct id", () => {
    const ids = BANK_SIGNATURES.map((s) => s.id);
    expect(new Set(ids).size).toBe(ids.length);
  });

  it("declares every label already normalized", () => {
    // A label written `Montant` would never match: the header cell is
    // normalized before the comparison and the table's side is not.
    for (const signature of BANK_SIGNATURES) {
      for (const variant of signature.variants) {
        for (const label of variant.labels) {
          expect(normalizeHeaderCell(label), `${signature.id}: ${label}`).toBe(
            label
          );
        }
      }
    }
  });

  it("keeps every role's label inside the fingerprint it projects", () => {
    // A role naming a label absent from `labels` would resolve to a column the
    // match never checked for.
    for (const signature of BANK_SIGNATURES) {
      for (const variant of signature.variants) {
        for (const [role, label] of Object.entries(variant.roles)) {
          expect(variant.labels, `${signature.id}.${role}`).toContain(label);
        }
      }
    }
  });

  it("refuses a fingerprint too small to identify anyone", () => {
    // `Date;Description;Montant` is the shape of half the corpus and of any
    // hand-made export. A three-label variant would put a bank's name over
    // files nobody can attribute to it.
    for (const signature of BANK_SIGNATURES) {
      for (const variant of signature.variants) {
        expect(
          variant.labels.length,
          `${signature.id}: ${variant.labels.join(",")}`
        ).toBeGreaterThanOrEqual(MIN_SIGNATURE_LABELS);
      }
    }
  });

  it("resolves a bank from its id, and nothing from an unknown one", () => {
    expect(bankSignatureById("desjardins")?.label).toBe("Desjardins");
    expect(bankSignatureById(null)).toBeNull();
    expect(bankSignatureById(undefined)).toBeNull();
  });
});

describe("each bank is recognised on its own fixture (#330)", () => {
  it("reads the Desjardins layout and names it", () => {
    expect(bankOf(readCsvFixture("bank-desjardins"))).toBe("desjardins");
    expect(configOf(readCsvFixture("bank-desjardins"))).toEqual({
      delimiter: ";",
      hasHeader: true,
      skipLines: 0,
      dateFormat: "DD/MM/YYYY",
      // Solde (column 3) is the balance the signature names, and it stays out
      // of the amount candidates.
      columnMapping: { date: 0, description: 1, amount: 2 },
      amountMode: "single",
      signConvention: "negative_expense",
    });
  });

  it("reads the English Desjardins header too", () => {
    const content =
      "Date;Description;Amount;Balance\n" +
      "05/01/2025;EPICERIE METRO;-84,32;915,68\n" +
      "15/01/2025;DEPOT PAIE;1250,00;2165,68\n" +
      "18/01/2025;HYDRO QUEBEC;-142,18;2023,50\n" +
      "22/01/2025;RESTAURANT;-56,75;1966,75\n";
    expect(bankOf(content)).toBe("desjardins");
  });

  it("reads a whole-line-quoted Desjardins export", () => {
    // `preprocessQuotedCSV` unwraps it into a comma-separated file; the
    // signature declares the quirk and the comma, so the match survives it.
    const content =
      '"Date,""Description"",Montant,Solde"\n' +
      '"05/01/2025,""EPICERIE METRO"",-84.32,915.68"\n' +
      '"15/01/2025,""DEPOT PAIE"",1250.00,2165.68"\n' +
      '"18/01/2025,""HYDRO QUEBEC"",-142.18,2023.50"\n' +
      '"22/01/2025,""RESTAURANT"",-56.75,1966.75"\n';
    expect(bankOf(content)).toBe("desjardins");
  });

  it("reads the RBC layout and maps CAD$ as the amount", () => {
    expect(bankOf(readCsvFixture("bank-rbc"))).toBe("rbc");
    expect(configOf(readCsvFixture("bank-rbc"))).toEqual({
      delimiter: ",",
      hasHeader: true,
      skipLines: 0,
      dateFormat: "DD/MM/YYYY",
      columnMapping: { date: 2, description: 4, amount: 6 },
      amountMode: "single",
      signConvention: "negative_expense",
    });
  });

  it("reads the Banque Nationale layout as a debit/credit pair", () => {
    expect(bankOf(readCsvFixture("bank-bnc"))).toBe("bnc");
    expect(configOf(readCsvFixture("bank-bnc"))).toEqual({
      delimiter: ";",
      hasHeader: true,
      skipLines: 0,
      dateFormat: "DD/MM/YYYY",
      columnMapping: {
        date: 0,
        description: 1,
        debitAmount: 3,
        creditAmount: 4,
      },
      amountMode: "debit_credit",
      signConvention: "negative_expense",
    });
  });

  it("reads the Tangerine layout and maps Name as the description", () => {
    expect(bankOf(readCsvFixture("bank-tangerine"))).toBe("tangerine");
    expect(configOf(readCsvFixture("bank-tangerine"))).toEqual({
      delimiter: ",",
      hasHeader: true,
      skipLines: 0,
      dateFormat: "DD/MM/YYYY",
      columnMapping: { date: 0, description: 2, amount: 4 },
      amountMode: "single",
      signConvention: "negative_expense",
    });
  });
});

describe("what the signatures actually buy (#330)", () => {
  it("keeps RBC's cheque number out of the amounts", () => {
    // The SAME rows, under a header no signature knows. `CAD$` and
    // `Cheque Number` are sparse-complementary — one cheque number in six rows
    // — so the shape scan pairs them as debit/credit and the row carrying a
    // cheque number imports as -247.95 instead of -6.95. Nothing in the file
    // can tell that apart from a genuine debit/credit pair; a documented layout
    // can.
    const anonymised = withHeader(
      readCsvFixture("bank-rbc"),
      "Type,Numero,Date,Cheque,Libelle,Note,Montant,Devise"
    );
    expect(bankOf(anonymised)).toBeNull();
    expect(configOf(anonymised).amountMode).toBe("debit_credit");
    expect(configOf(anonymised).columnMapping).toEqual({
      date: 2,
      description: 4,
      debitAmount: 3,
      creditAmount: 6,
    });

    // With the header the bank actually prints, the same rows read as one
    // signed column.
    expect(configOf(readCsvFixture("bank-rbc")).amountMode).toBe("single");
  });

  it("keeps Tangerine's direction column out of the description, signature or not", () => {
    // `Transaction` is a description keyword of the generic dictionary, and
    // Tangerine's `Transaction` column holds DEBIT / CREDIT. Read as the
    // description, every transaction of the file is labelled `DEBIT`.
    //
    // This used to be rescued by the Tangerine signature alone, leaving any
    // unrecognised file with a `Transaction` column broken. The cardinality
    // veto in `detectDescriptionColumn` fixes the cause instead: a labelled
    // column that behaves like an enum is not the description, whether or not a
    // bank was identified.
    const anonymised = withHeader(
      readCsvFixture("bank-tangerine"),
      "Date,Transaction,Nom,Note,Montant"
    );
    expect(bankOf(anonymised)).toBeNull();
    expect(configOf(anonymised).columnMapping.description).toBe(2);

    expect(configOf(readCsvFixture("bank-tangerine")).columnMapping.description).toBe(
      2
    );
  });

  it("does not let a generic variant claim a richer header", () => {
    // Review finding on #340: Desjardins' fingerprint is four labels any
    // Canadian bank could emit, so matching them as a SUBSET announced
    // "Format Desjardins reconnu" over files that have nothing to do with it.
    // A variant made only of generic labels now has to describe the header
    // exactly.
    const richer =
      "Date;Description;Débit;Crédit;Montant;Solde\n" +
      "05/01/2025;EPICERIE;84,32;;-84,32;1000,00\n" +
      "15/01/2025;DEPOT PAIE;;1250,00;1250,00;2250,00\n" +
      "20/01/2025;LOYER;900,00;;-900,00;1350,00\n" +
      "25/01/2025;REMBOURSEMENT;;45,00;45,00;1395,00\n";
    expect(bankOf(richer)).toBeNull();

    // The exact header still is Desjardins.
    const exact =
      "Date;Description;Montant;Solde\n" +
      "05/01/2025;EPICERIE;-84,32;1000,00\n" +
      "15/01/2025;DEPOT PAIE;1250,00;2250,00\n";
    expect(bankOf(exact)).toBe("desjardins");
  });

  it("does not let a signature's amount column displace a pair it is not in", () => {
    // The measured regression: with the false Desjardins match above, the
    // signature's `Montant` short-circuited the sparse-complementary scan, so a
    // file that reads correctly as debit/credit became one unsigned column and
    // every deposit imported as an expense. The scan now runs first and the
    // signature only wins when the pair contains its column — which is what
    // RBC's genuine `Cheque Number` / `CAD$` case needs.
    const richer =
      "Date;Description;Débit;Crédit;Montant;Solde\n" +
      "05/01/2025;EPICERIE;84,32;;-84,32;1000,00\n" +
      "15/01/2025;DEPOT PAIE;;1250,00;1250,00;2250,00\n" +
      "20/01/2025;LOYER;900,00;;-900,00;1350,00\n" +
      "25/01/2025;REMBOURSEMENT;;45,00;45,00;1395,00\n";
    const config = configOf(richer);
    expect(config.amountMode).toBe("debit_credit");
    expect(config.columnMapping.debitAmount).toBe(2);
    expect(config.columnMapping.creditAmount).toBe(3);

    // RBC keeps its override: there the declared amount column IS in the pair.
    expect(configOf(readCsvFixture("bank-rbc")).amountMode).toBe("single");
  });

  it("holds even for a legitimately recognised bank whose file grew columns", () => {
    // The guard above is only reachable through a signature that really matches,
    // so it needs a discriminating one. Tangerine is identified by `memo`, so it
    // still matches as a subset when the export gains Débit/Crédit columns — and
    // then its declared `Amount` must not displace that genuine pair either.
    const grown =
      "Date,Transaction,Name,Memo,Amount,Débit,Crédit\n" +
      "05/01/2025,DEBIT,EPICERIE METRO,,-84.32,84.32,\n" +
      "15/01/2025,CREDIT,DEPOT PAIE,Paie,1250.00,,1250.00\n" +
      "20/01/2025,DEBIT,LOYER,,-900.00,900.00,\n" +
      "25/01/2025,CREDIT,REMBOURSEMENT,,45.00,,45.00\n";
    expect(bankOf(grown)).toBe("tangerine");

    const config = configOf(grown);
    expect(config.amountMode).toBe("debit_credit");
    expect(config.columnMapping.debitAmount).toBe(5);
    expect(config.columnMapping.creditAmount).toBe(6);
  });
});

describe("an unknown file falls back to the generic dictionary (#330)", () => {
  it("names no bank on any of the shape fixtures", () => {
    // The corpus frozen by #326 is synthetic and belongs to no bank. A single
    // false positive here is a banner claiming a bank the file is not from.
    for (const name of CSV_FIXTURE_NAMES) {
      if (name.startsWith("bank-")) continue;
      if (name === "absolute-indicator") continue; // refused before any bank
      expect(bankOf(readCsvFixture(name)), name).toBeNull();
    }
  });

  it("leaves the pre-#330 configurations untouched", () => {
    // The signatures must not have moved a single mapping of the corpus.
    expect(configOf(readCsvFixture("signed-amount"))).toEqual({
      delimiter: ";",
      hasHeader: true,
      skipLines: 0,
      dateFormat: "DD/MM/YYYY",
      columnMapping: { date: 0, description: 1, amount: 2 },
      amountMode: "single",
      signConvention: "negative_expense",
    });
  });
});

describe("the preconditions of a match (#330)", () => {
  const rows =
    "05/01/2025;EPICERIE METRO;-84,32;915,68\n" +
    "15/01/2025;DEPOT PAIE;1250,00;2165,68\n" +
    "18/01/2025;HYDRO QUEBEC;-142,18;2023,50\n" +
    "22/01/2025;RESTAURANT;-56,75;1966,75\n";

  it("refuses a delimiter the bank does not use", () => {
    const tabbed = ("Date;Description;Montant;Solde\n" + rows).replace(
      /;/g,
      "\t"
    );
    expect(bankOf(tabbed)).toBeNull();
  });

  it("refuses an export carrying more preamble than the bank prints", () => {
    const content =
      "RELEVE DE COMPTE\nCompte 12345\nDate;Description;Montant;Solde\n" + rows;
    expect(bankOf(content)).toBeNull();
  });

  it("refuses a whole-line-quoted file for a bank that does not quote", () => {
    // Tangerine's labels, wrapped the way Desjardins wraps its exports. The
    // quirk is what says this is not a Tangerine file.
    const content =
      '"Date,""Transaction"",Name,Memo,Amount"\n' +
      '"05/01/2025,""DEBIT"",EPICERIE,,-84.32"\n' +
      '"15/01/2025,""CREDIT"",PAIE,,1250.00"\n' +
      '"18/01/2025,""DEBIT"",HYDRO,,-142.18"\n' +
      '"22/01/2025,""DEBIT"",RESTO,,-56.75"\n';
    expect(bankOf(content)).toBeNull();
  });

  it("names no bank for a headerless file, whatever its shape", () => {
    // There is no label to read. This is the same boundary that leaves
    // `header_signature` null on those sources.
    expect(bankOf(readCsvFixture("no-header"))).toBeNull();
  });

  it("matches on the whole label, never on a substring", () => {
    // `matchHeaderColumn` matches substrings — that is the generic dictionary's
    // rule and the reason it mis-reads these layouts. A fingerprint compared
    // loosely would inherit the same problem.
    expect(
      matchBankSignature({
        headerRow: ["Date", "Description", "Montant net", "Solde"],
        delimiter: ";",
        skipLines: 0,
        wholeLineQuoted: false,
      })
    ).toBeNull();
  });

  it("resolves the roles to the columns of THIS file, not to the declared order", () => {
    const match = matchBankSignature({
      headerRow: ["Solde", "Montant", "Description", "Date"],
      delimiter: ";",
      skipLines: 0,
      wholeLineQuoted: false,
    });
    expect(match?.signature.id).toBe("desjardins");
    expect(match?.roles).toEqual({
      date: 3,
      description: 2,
      amount: 1,
      debit: null,
      credit: null,
      balance: 0,
      roleCount: 4,
    });
  });
});

describe("the stored signature (#330)", () => {
  it("stores the normalized labels, in order", () => {
    expect(buildHeaderSignature(["Date", "Description", "Montant", "Solde"])).toBe(
      '["date","description","montant","solde"]'
    );
  });

  it("stores nothing for a file with no header row", () => {
    // The whole point of the boundary: `Col 0`, `Col 1` … is not a signature,
    // and inventing one from the data would fire on every change of content.
    expect(buildHeaderSignature(null)).toBeNull();
    expect(buildHeaderSignature([])).toBeNull();
  });

  it("reads back what it wrote", () => {
    const stored = buildHeaderSignature(["Date", "Montant"]);
    expect(parseHeaderSignature(stored)).toEqual(["date", "montant"]);
  });

  it("returns null rather than throwing on anything it did not write", () => {
    // A hash left by an older build, a truncated row, hand-edited SQL: drift
    // detection switches off, an import never blows up.
    expect(parseHeaderSignature(null)).toBeNull();
    expect(parseHeaderSignature("")).toBeNull();
    expect(parseHeaderSignature("d41d8cd98f00b204")).toBeNull();
    expect(parseHeaderSignature("{}")).toBeNull();
    expect(parseHeaderSignature("[1,2,3]")).toBeNull();
  });
});

describe("drift detection stays silent when it should (#330)", () => {
  const stored = buildHeaderSignature(["Date", "Description", "Montant"]);

  it("says nothing about a source that never recorded a signature", () => {
    expect(detectHeaderDrift(null, ["Date", "Solde"])).toBeNull();
    expect(detectHeaderDrift(undefined, ["Date", "Solde"])).toBeNull();
  });

  it("says nothing about a headerless file", () => {
    expect(detectHeaderDrift(stored, null)).toBeNull();
    expect(detectHeaderDrift(stored, [])).toBeNull();
  });

  it("says nothing about an identical header", () => {
    expect(
      detectHeaderDrift(stored, ["Date", "Description", "Montant"])
    ).toBeNull();
  });

  it("says nothing about a cosmetic rename", () => {
    // Accents, case, punctuation and spacing are stripped before the
    // comparison: none of them changes which column holds what.
    expect(
      detectHeaderDrift(stored, ["DATE", "Description ", "MONTANT ($)"])
    ).toBeNull();
  });

  it("says nothing when the stored value cannot be read", () => {
    expect(detectHeaderDrift("not json", ["Date"])).toBeNull();
  });
});

describe("drift detection names the columns that moved (#330)", () => {
  it("reports a column that changed position", () => {
    const stored = buildHeaderSignature([
      "Date",
      "Description",
      "Montant",
      "Solde",
    ]);
    expect(
      detectHeaderDrift(stored, ["Date", "Description", "Solde", "Montant"])
    ).toEqual([
      {
        kind: "moved",
        normalizedLabel: "solde",
        label: "Solde",
        previousIndex: 3,
        currentIndex: 2,
      },
      {
        kind: "moved",
        normalizedLabel: "montant",
        label: "Montant",
        previousIndex: 2,
        currentIndex: 3,
      },
    ]);
  });

  it("reports a new column and the shift it causes", () => {
    const stored = buildHeaderSignature(["Date", "Description", "Montant"]);
    expect(
      detectHeaderDrift(stored, ["Date", "Devise", "Description", "Montant"])
    ).toEqual([
      {
        kind: "added",
        normalizedLabel: "devise",
        label: "Devise",
        previousIndex: null,
        currentIndex: 1,
      },
      {
        kind: "moved",
        normalizedLabel: "description",
        label: "Description",
        previousIndex: 1,
        currentIndex: 2,
      },
      {
        kind: "moved",
        normalizedLabel: "montant",
        label: "Montant",
        previousIndex: 2,
        currentIndex: 3,
      },
    ]);
  });

  it("reports a column that disappeared, under its stored label", () => {
    // The raw spelling of a removed column is recorded nowhere — only the
    // normalized label survives, and that is what is shown.
    const stored = buildHeaderSignature(["Date", "Description", "Solde"]);
    expect(detectHeaderDrift(stored, ["Date", "Description"])).toEqual([
      {
        kind: "removed",
        normalizedLabel: "solde",
        label: "solde",
        previousIndex: 2,
        currentIndex: null,
      },
    ]);
  });

  it("survives a bank swapping its amount column for a debit/credit pair", () => {
    const stored = buildHeaderSignature([
      "Date",
      "Description",
      "Montant",
      "Solde",
    ]);
    const drift = detectHeaderDrift(stored, [
      "Date",
      "Description",
      "Débit",
      "Crédit",
      "Solde",
    ])!;
    expect(drift.map((e) => [e.kind, e.normalizedLabel])).toEqual([
      ["added", "debit"],
      ["added", "credit"],
      ["moved", "solde"],
      ["removed", "montant"],
    ]);
  });
});

// ---------------------------------------------------------------------------
// Static guards. The wiring lives in a React hook and two components, and the
// repository has no jsdom — same technique as the guards of #324 to #329.
// ---------------------------------------------------------------------------

const WIZARD_SRC = readFileSync(
  resolve(import.meta.dirname, "..", "hooks", "useImportWizard.ts"),
  "utf-8"
);
const PAGE_SRC = readFileSync(
  resolve(import.meta.dirname, "..", "pages", "ImportPage.tsx"),
  "utf-8"
);
const componentSrc = (name: string) =>
  readFileSync(
    resolve(import.meta.dirname, "..", "components", "import", name),
    "utf-8"
  );

describe("the signature is written at every successful import (#330)", () => {
  it("builds it from the header row the import actually read", () => {
    expect(WIZARD_SRC).toContain("buildHeaderSignature(");
    expect(WIZARD_SRC).toContain(
      "config.hasHeader ? state.previewHeaders : null"
    );
  });

  it("writes it on both arms of the single write point", () => {
    const body = WIZARD_SRC.slice(
      WIZARD_SRC.indexOf("const executeImport ="),
      WIZARD_SRC.indexOf("const goToStep =")
    );
    expect(body.match(/header_signature: headerSignature/g)).toHaveLength(2);
  });

  it("keeps it out of the format codec", () => {
    // It is drift metadata, not one of the eight fields that decide how a row
    // is read. `formatToRow` naming it would put it back in the format.
    const CODEC = readFileSync(
      resolve(import.meta.dirname, "importFormat.ts"),
      "utf-8"
    );
    expect(CODEC).not.toContain("header_signature");
    expect(CODEC).not.toContain("headerSignature");
  });
});

describe("drift is computed on the way to the preview (#330)", () => {
  const body = () =>
    WIZARD_SRC.slice(
      WIZARD_SRC.indexOf("const parseAndPreview ="),
      WIZARD_SRC.indexOf("const checkDuplicatesInternal =")
    );

  it("compares the stored signature to the headers just parsed", () => {
    expect(body()).toContain("detectHeaderDrift(");
    expect(body()).toContain("state.existingSource?.header_signature");
  });

  it("does not compare anything on a headerless file", () => {
    expect(body()).toContain("state.sourceConfig.hasHeader");
  });

  it("still reaches the preview step", () => {
    expect(body()).toContain(
      'dispatch({ type: "SET_STEP", payload: "file-preview" })'
    );
  });

  it("drops the score the re-detection produced, which describes another format", () => {
    // The re-detection measures the format the PANEL offers, not the one in
    // use. Keeping its score would show "Format reconnu — 6 of 6 rows read"
    // beside the stored mapping as soon as the user steps back.
    expect(body()).toContain(
      'dispatch({ type: "SET_DETECTION_SCORE", payload: null })'
    );
  });
});

describe("the drift panel offers two outcomes and writes neither (#330)", () => {
  const PANEL = componentSrc("FormatDriftPanel.tsx");

  it("is rendered on the preview step, above the table", () => {
    expect(PAGE_SRC).toContain("{state.formatDrift && (");
    expect(PAGE_SRC).toContain("<FormatDriftPanel");
    expect(PAGE_SRC).toContain("onAdopt={adoptDriftFormat}");
    expect(PAGE_SRC).toContain("onKeep={keepCurrentFormat}");
    expect(PAGE_SRC.indexOf("<FormatDriftPanel")).toBeLessThan(
      PAGE_SRC.indexOf("<FilePreviewTable")
    );
  });

  it("re-parses under the adopted format instead of re-reading state", () => {
    // `state` has not re-rendered when the parse starts, exactly as for the
    // sign flip: reading it back would redisplay the table just replaced.
    const body = WIZARD_SRC.slice(
      WIZARD_SRC.indexOf("const adoptDriftFormat ="),
      WIZARD_SRC.indexOf("const keepCurrentFormat =")
    );
    expect(body).toContain("parseFilesInternal(adopted)");
    expect(body).not.toContain("createSource(");
    expect(body).not.toContain("updateSource(");
  });

  it("renders the three kinds of change through i18n", () => {
    for (const key of ["columnMoved", "columnAdded", "columnRemoved"]) {
      expect(PANEL, key).toContain(`import.drift.${key}`);
    }
  });
});

describe("the repair path is stated in the interface (#330)", () => {
  const NOTICE = componentSrc("RepairPathNotice.tsx");

  it("names the history deletion rather than a vague warning", () => {
    expect(NOTICE).toContain("import.repairPath.title");
    expect(NOTICE).toContain("import.repairPath.body");
    for (const locale of [fr, en]) {
      expect(locale.import.repairPath.body.length).toBeGreaterThan(0);
    }
    // The two facts a user needs: duplicates are matched on the amount, and the
    // faulty import has to go first.
    expect(fr.import.repairPath.body).toContain("historique");
    expect(en.import.repairPath.body).toContain("history");
  });

  it("appears in the preview and in the drift panel, not in one of the two", () => {
    expect(componentSrc("FilePreviewTable.tsx")).toContain("<RepairPathNotice />");
    expect(componentSrc("FormatDriftPanel.tsx")).toContain("<RepairPathNotice />");
  });
});

describe("the recognised-bank banner (#330)", () => {
  const PANEL = componentSrc("SourceConfigPanel.tsx");

  it("names the bank only when the rows actually read", () => {
    // A bank label over a file two thirds of whose rows fail is a claim the app
    // cannot back; the uncertain wording is the one that helps there.
    expect(PANEL).toContain("detectionScore?.confident");
    expect(PANEL).toContain("import.config.detectionBank");
  });

  it("interpolates the bank name instead of translating it", () => {
    // A bank is a proper noun. `Desjardins` is `Desjardins` in both languages.
    for (const locale of [fr, en]) {
      expect(locale.import.config.detectionBank).toContain("{{bank}}");
      expect(locale.import.config.detectionBank).toContain("{{read}}");
      expect(locale.import.config.detectionBank).toContain("{{total}}");
    }
  });

  it("clears the bank with the score, in one place", () => {
    // Three sites drop the score (a hand edit, a template, a sign flip). The
    // reducer clearing the bank alongside it is what keeps a fourth from
    // forgetting.
    const reducerCase = WIZARD_SRC.slice(
      WIZARD_SRC.indexOf('case "SET_DETECTION_SCORE":'),
      WIZARD_SRC.indexOf('case "SET_DETECTED_BANK":')
    );
    expect(reducerCase).toContain("detectedBank: action.payload === null");
  });
});

describe("every new string exists in both languages (#330)", () => {
  it("carries the drift panel", () => {
    for (const key of [
      "title",
      "intro",
      "columnMoved",
      "columnAdded",
      "columnRemoved",
      "adopt",
      "adoptHint",
      "adoptUnavailable",
      "keep",
      "keepHint",
    ] as const) {
      expect(fr.import.drift[key].length, `fr.${key}`).toBeGreaterThan(0);
      expect(en.import.drift[key].length, `en.${key}`).toBeGreaterThan(0);
    }
  });

  it("interpolates the column positions in both languages", () => {
    for (const locale of [fr, en]) {
      expect(locale.import.drift.columnMoved).toContain("{{label}}");
      expect(locale.import.drift.columnMoved).toContain("{{from}}");
      expect(locale.import.drift.columnMoved).toContain("{{to}}");
      expect(locale.import.drift.columnAdded).toContain("{{to}}");
      expect(locale.import.drift.columnRemoved).toContain("{{from}}");
    }
  });

  it("carries the repair path", () => {
    for (const key of ["title", "body"] as const) {
      expect(fr.import.repairPath[key].length, `fr.${key}`).toBeGreaterThan(0);
      expect(en.import.repairPath[key].length, `en.${key}`).toBeGreaterThan(0);
    }
  });
});