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diff --git a/src/m_pgp_inspect/test/PGPInspectModelTest.cpp b/src/m_pgp_inspect/test/PGPInspectModelTest.cpp
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+++ b/src/m_pgp_inspect/test/PGPInspectModelTest.cpp
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+/**
+ * Copyright (C) 2021-2024 Saturneric <[email protected]>
+ *
+ * This file is part of GpgFrontend.
+ *
+ * GpgFrontend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GpgFrontend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from
+ * the gpg4usb project, which is under GPL-3.0-or-later.
+ *
+ * All the source code of GpgFrontend was modified and released by
+ * Saturneric <[email protected]> starting on May 12, 2021.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#include <gtest/gtest.h>
+
+#include <QCoreApplication>
+
+#include "PGPInspectModel.h"
+
+namespace {
+
+/// A minimal but complete document, in the shape the Rust walk emits.
+constexpr const char* kDocument = R"({
+  "format": "armored",
+  "size": 325,
+  "errors": [],
+  "blocks": [
+    {
+      "kind": "armored",
+      "offset": 0,
+      "armor": {
+        "blockType": "PGP SIGNATURE",
+        "headers": [{"label": "Version", "value": "GnuPG v2"}],
+        "crc24": "ok"
+      },
+      "packets": [
+        {
+          "tag": 8,
+          "tagName": "Compressed Data",
+          "offset": 0,
+          "headerVersion": "new",
+          "headerLength": 2,
+          "bodyLength": 189,
+          "lengthType": "fixed",
+          "fields": [{"label": "Compression Algorithm", "value": "ZIP"}],
+          "children": [
+            {
+              "tag": 2,
+              "tagName": "Signature",
+              "offset": 0,
+              "headerVersion": "old",
+              "headerLength": 3,
+              "bodyLength": 100,
+              "lengthType": "fixed",
+              "version": 4,
+              "fields": [{"label": "Hash Algorithm", "value": "Sha256"}],
+              "children": [],
+              "error": null
+            }
+          ],
+          "error": null
+        }
+      ],
+      "error": null
+    }
+  ]
+})";
+
+}  // namespace
+
+// -- reading the document ----------------------------------------------------
+
+TEST(PGPInspectModelTest, ReadsTheDocumentShape) {
+  const auto document = ParsePGPInspectDocument(kDocument);
+
+  ASSERT_TRUE(document.valid);
+  EXPECT_EQ(document.format, QString("armored"));
+  EXPECT_EQ(document.size, 325);
+  ASSERT_EQ(document.blocks.size(), 1);
+  EXPECT_TRUE(document.errors.isEmpty());
+}
+
+TEST(PGPInspectModelTest, ReadsTheArmorEnvelope) {
+  const auto document = ParsePGPInspectDocument(kDocument);
+  const auto& block = document.blocks.at(0);
+
+  ASSERT_TRUE(block.has_armor);
+  EXPECT_EQ(block.armor.block_type, QString("PGP SIGNATURE"));
+  EXPECT_EQ(block.armor.crc24, QString("ok"));
+  ASSERT_EQ(block.armor.headers.size(), 1);
+  EXPECT_EQ(block.armor.headers.at(0).label, QString("Version"));
+}
+
+TEST(PGPInspectModelTest, NestsChildrenUnderTheirContainer) {
+  // The recursion is the reason the tree exists; a flat read would lose it.
+  const auto document = ParsePGPInspectDocument(kDocument);
+  const auto& packets = document.blocks.at(0).packets;
+
+  ASSERT_EQ(packets.size(), 1);
+  EXPECT_EQ(packets.at(0).tag, 8);
+  ASSERT_EQ(packets.at(0).children.size(), 1);
+  EXPECT_EQ(packets.at(0).children.at(0).tag, 2);
+  EXPECT_EQ(packets.at(0).children.at(0).version, 4);
+}
+
+TEST(PGPInspectModelTest, CountsNestedPacketsToo) {
+  EXPECT_EQ(ParsePGPInspectDocument(kDocument).PacketCount(), 2);
+}
+
+TEST(PGPInspectModelTest, KeepsTheFramingFiguresVerbatim) {
+  const auto& packet =
+      ParsePGPInspectDocument(kDocument).blocks.at(0).packets.at(0);
+
+  EXPECT_EQ(packet.offset, 0);
+  EXPECT_EQ(packet.header_length, 2);
+  EXPECT_EQ(packet.body_length, 189);
+  EXPECT_EQ(packet.header_version, QString("new"));
+  EXPECT_EQ(packet.length_type, QString("fixed"));
+}
+
+TEST(PGPInspectModelTest, AbsentVersionReadsAsMinusOne) {
+  // Most container packets carry no version octet. That is a fact about the
+  // type, so it must not look like a defect in the document.
+  const auto& packet =
+      ParsePGPInspectDocument(kDocument).blocks.at(0).packets.at(0);
+  EXPECT_EQ(packet.version, -1);
+  EXPECT_FALSE(packet.Malformed());
+}
+
+// -- the shapes that are not the happy one ------------------------------------
+
+TEST(PGPInspectModelTest, MalformedJsonIsReportedNotThrown) {
+  const auto document = ParsePGPInspectDocument("{ this is not json");
+
+  EXPECT_FALSE(document.valid);
+  EXPECT_FALSE(document.parse_error.isEmpty());
+  EXPECT_TRUE(document.blocks.isEmpty());
+}
+
+TEST(PGPInspectModelTest, EmptyInputIsReportedNotThrown) {
+  const auto document = ParsePGPInspectDocument({});
+
+  EXPECT_FALSE(document.valid);
+  EXPECT_FALSE(document.parse_error.isEmpty());
+}
+
+TEST(PGPInspectModelTest, ANonObjectDocumentIsRefused) {
+  EXPECT_FALSE(ParsePGPInspectDocument("[1, 2, 3]").valid);
+}
+
+TEST(PGPInspectModelTest, AnEmptyDocumentIsValidAndEmpty) {
+  // "nothing recognisable here" is a finding the inspector reports, not a
+  // failure to read its answer.
+  const auto document = ParsePGPInspectDocument(
+      R"({"format":"binary","size":4,"blocks":[],"errors":["not OpenPGP data"]})");
+
+  ASSERT_TRUE(document.valid);
+  EXPECT_TRUE(document.blocks.isEmpty());
+  ASSERT_EQ(document.errors.size(), 1);
+  EXPECT_EQ(document.errors.at(0), QString("not OpenPGP data"));
+}
+
+TEST(PGPInspectModelTest, APacketErrorSurvivesIntoTheTree) {
+  const auto document = ParsePGPInspectDocument(
+      R"({"blocks":[{"packets":[{"tag":2,"error":"the packet body is truncated"}]}]})");
+
+  ASSERT_EQ(document.blocks.size(), 1);
+  const auto& packet = document.blocks.at(0).packets.at(0);
+  EXPECT_TRUE(packet.Malformed());
+  EXPECT_EQ(packet.error, QString("the packet body is truncated"));
+}
+
+TEST(PGPInspectModelTest, MissingFieldsTakeTheirDefaults) {
+  // A document from an older or newer engine must degrade field by field
+  // rather than costing the reader the whole tree.
+  const auto document =
+      ParsePGPInspectDocument(R"({"blocks":[{"packets":[{}]}]})");
+
+  ASSERT_TRUE(document.valid);
+  const auto& packet = document.blocks.at(0).packets.at(0);
+  EXPECT_EQ(packet.tag, -1);
+  EXPECT_TRUE(packet.tag_name.isEmpty());
+  EXPECT_EQ(packet.body_length, 0);
+}
+
+TEST(PGPInspectModelTest, ADetailRowWithNeitherHalfIsDropped) {
+  const auto document = ParsePGPInspectDocument(
+      R"({"blocks":[{"packets":[{"fields":[{},{"label":"A","value":"B"}]}]}]})");
+
+  const auto& fields = document.blocks.at(0).packets.at(0).fields;
+  ASSERT_EQ(fields.size(), 1);
+  EXPECT_EQ(fields.at(0).label, QString("A"));
+}
+
+TEST(PGPInspectModelTest, ReadsTheCleartextHalf) {
+  const auto document = ParsePGPInspectDocument(
+      R"({"format":"cleartext","blocks":[{"kind":"cleartext","cleartext":{"textSize":42,"headers":[{"label":"Hash","value":"SHA256"}]},"packets":[]}]})");
+
+  const auto& block = document.blocks.at(0);
+  ASSERT_TRUE(block.has_cleartext);
+  EXPECT_EQ(block.cleartext_text_size, 42);
+  ASSERT_EQ(block.cleartext_headers.size(), 1);
+  EXPECT_EQ(block.cleartext_headers.at(0).value, QString("SHA256"));
+}
+
+// -- whether there is anything to show ----------------------------------------
+
+TEST(PGPInspectModelTest, ADocumentWithPacketsHasStructure) {
+  EXPECT_TRUE(PGPInspectHasStructure(ParsePGPInspectDocument(kDocument)));
+}
+
+TEST(PGPInspectModelTest, PlainTextHasNoStructure) {
+  // The menu entry is greyed out on exactly this: a valid document saying the
+  // input is not OpenPGP. Opening a window to be told nothing is worse than
+  // an entry that cannot be clicked.
+  EXPECT_FALSE(PGPInspectHasStructure(ParsePGPInspectDocument(
+      R"({"format":"binary","size":9,"blocks":[],"errors":["not OpenPGP data"]})")));
+}
+
+TEST(PGPInspectModelTest, AnUnreadableDocumentHasNoStructure) {
+  EXPECT_FALSE(PGPInspectHasStructure(ParsePGPInspectDocument("not json")));
+  EXPECT_FALSE(PGPInspectHasStructure({}));
+}
+
+TEST(PGPInspectModelTest, ABlockWithNoPacketsHasNoStructure) {
+  // An armor envelope whose body decoded to nothing: the header parsed, so
+  // the document is valid, but there is still no packet tree to render.
+  EXPECT_FALSE(PGPInspectHasStructure(ParsePGPInspectDocument(
+      R"({"format":"armored","blocks":[{"kind":"armored","packets":[]}]})")));
+}
+
+TEST(PGPInspectModelTest, ANestedPacketAloneIsStructureEnough) {
+  EXPECT_TRUE(PGPInspectHasStructure(ParsePGPInspectDocument(
+      R"({"blocks":[{"packets":[{"tag":8,"children":[{"tag":2}]}]}]})")));
+}
+
+// -- the summaries the tree shows ---------------------------------------------
+
+TEST(PGPInspectModelTest, APacketSummaryNamesTagVersionOffsetAndSize) {
+  const auto& packet =
+      ParsePGPInspectDocument(kDocument).blocks.at(0).packets.at(0).children.at(
+          0);
+  const auto summary = PGPInspectPacketSummary(packet, 1);
+
+  EXPECT_TRUE(summary.contains("#1"));
+  EXPECT_TRUE(summary.contains("Signature"));
+  EXPECT_TRUE(summary.contains("tag 2"));
+  EXPECT_TRUE(summary.contains("v4"));
+  EXPECT_TRUE(summary.contains("@0x0000"));
+  // Header plus body: the bytes this packet occupies on the wire.
+  EXPECT_TRUE(summary.contains("103"));
+}
+
+TEST(PGPInspectModelTest, ASummaryFlagsANonFixedLength) {
+  PGPInspectPacket packet;
+  packet.tag = 11;
+  packet.tag_name = "Literal Data";
+  packet.length_type = "partial";
+
+  EXPECT_TRUE(PGPInspectPacketSummary(packet, 2).contains("partial"));
+}
+
+TEST(PGPInspectModelTest, ASummaryOfANamelessPacketStillReads) {
+  PGPInspectPacket packet;
+  packet.tag = 60;
+
+  const auto summary = PGPInspectPacketSummary(packet, 1);
+  EXPECT_TRUE(summary.contains("Unknown"));
+  EXPECT_TRUE(summary.contains("tag 60"));
+}
+
+TEST(PGPInspectModelTest, ABlockSummaryDistinguishesTheThreeKinds) {
+  const auto armored = ParsePGPInspectDocument(kDocument).blocks.at(0);
+  EXPECT_TRUE(PGPInspectBlockSummary(armored, 1).contains("PGP SIGNATURE"));
+
+  PGPInspectBlock cleartext;
+  cleartext.kind = "cleartext";
+  EXPECT_TRUE(PGPInspectBlockSummary(cleartext, 1).contains("cleartext"));
+
+  PGPInspectBlock binary;
+  binary.kind = "binary";
+  EXPECT_TRUE(PGPInspectBlockSummary(binary, 1).contains("binary"));
+}