refactor: Decoupling chat architecture (#367)

* refactor: Migrate tests to Qt Creator plugin framework and update llmqore transports

* refactor: Move conversation history into IDE-free session library

* refactor: Extract turn context assembly behind injected ports

* build: Add RunQodeAssistTests target for the plugin test suite

* refactor: Route the chat through a Session and ChatBackend seam

tests/QodeAssistTest.hpp

@@ -0,0 +1,130 @@
+// Copyright (C) 2026 Petr Mironychev
+// Copyright (C) 2025 Povilas Kanapickas <povilas@radix.lt>
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <QJsonObject>
+#include <QObject>
+#include <QSharedPointer>
+
+#include "context/DocumentContextReader.hpp"
+#include "settings/CodeCompletionSettings.hpp"
+
+QT_BEGIN_NAMESPACE
+class QTextDocument;
+QT_END_NAMESPACE
+
+namespace QodeAssist {
+
+class QodeAssistTest final : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void testProcessTextEmpty();
+    void testProcessTextCommentsAroundCodeBlock();
+    void testProcessTextWithPlainCodeBlockNoNewline();
+    void testProcessTextWithPlainCodeBlockWithNewline();
+    void testProcessTextNoCommentsWithLanguageCodeBlock();
+    void testProcessTextNoCommentsWithPlainCodeBlockNoNewline();
+    void testProcessTextNoCommentsWithPlainCodeBlockWithNewline();
+    void testProcessTextWithMultipleCodeBlocksDifferentLanguages();
+    void testProcessTextWithMultipleCodeBlocksSameLanguage();
+    void testProcessTextWithMultiplePlainCodeBlocksWithNewline();
+    void testProcessTextWithMultiplePlainCodeBlocksWithoutNewline();
+    void testProcessTextWithEmptyLines();
+    void testProcessTextPlainCodeBlockWithNewlineWithEmptyLines();
+    void testProcessTextWithoutCodeBlock();
+    void testDetectLanguageFromLine();
+    void testDetectLanguageFromExtension();
+    void testCommentPrefixForDifferentLanguages();
+    void testHasCodeBlocks();
+
+    void testReplaceLengthEmptyRight();
+    void testReplaceLengthNoOverlap();
+    void testReplaceLengthSingleCharNoOverlap();
+    void testReplaceLengthLcpExtendsRight();
+    void testReplaceLengthLcpPartialEngineCall();
+    void testReplaceLengthLcpThenClosingTailExtendsFull();
+    void testReplaceLengthClosingTailReplaceSemicolon();
+    void testReplaceLengthClosingTailReplaceParen();
+    void testReplaceLengthClosingTailReplaceBrackets();
+    void testReplaceLengthClosingTailReplaceBracesAndSemi();
+    void testReplaceLengthClosingTailWithLeadingSpace();
+    void testReplaceLengthClosingTailEqualsSemi();
+    void testReplaceLengthClosingTailNoMatchingClose();
+    void testReplaceLengthRealCodeRightNoLcp();
+    void testReplaceLengthTrailingWhitespaceOnlyLeftAlone();
+
+    void testCacheControlBreakpointWithoutExtendedTtl();
+    void testCacheControlBreakpointWithExtendedTtl();
+    void testCacheControlSystemAsStringWrappedIntoArray();
+    void testCacheControlEmptySystemStringIsNotWrapped();
+    void testCacheControlSystemAsArrayMarksLastBlock();
+    void testCacheControlToolsLastEntryGetsCacheControl();
+    void testCacheControlSingleMessageHistorySkipped();
+    void testCacheControlHistoryBreakpointOnSecondToLastMessage();
+    void testCacheControlHistoryArrayContentMarksLastBlock();
+    void testCacheControlNoSystemNoToolsNoMessagesIsNoop();
+    void testCacheControlEmptyToolsArrayIsNoop();
+
+    void testGetLineText();
+    void testGetContext();
+    void testGetContextWithCopyright();
+    void testReadWholeFile();
+    void testReadWholeFileWithCopyright();
+    void testReadWholeFileWithMultilineCopyright();
+    void testFindCopyrightSingleLine();
+    void testFindCopyrightMultiLine();
+    void testFindCopyrightMultipleBlocks();
+    void testFindCopyrightNoCopyright();
+    void testGetContextBetween();
+    void testPrepareContext();
+
+    void testHistorySnapshotUsesCurrentVersion();
+    void testHistorySnapshotRoundTrip();
+    void testUnsupportedChatVersionIsRejected();
+    void testChatFileWithoutMessagesArrayIsRejected();
+    void testLegacyChatFileConvertsToHistory();
+    void testLegacyToolRowWithoutMetadataKeepsItsText();
+    void testChatRowsRoundTripThroughHistory();
+    void testCompressedChatShapeReloadsAsOneAssistantRow();
+    void testHistoryAppliesToChatModel();
+    void testAdjacentThinkingBlocksSurviveReload();
+
+    void testSessionAppendsUserTurnBeforeSending();
+    void testSessionStreamsTextThinkingAndTools();
+    void testSessionTrimsStreamedText();
+    void testSessionAbandoningTheTurnCancelsTheBackend();
+    void testSessionProjectionMatchesHistory();
+    void testSessionAccumulatesStreamedThinking();
+    void testSessionKeepsThinkingAfterToolContinuation();
+    void testSessionDropsPreToolTextWhenAsked();
+    void testSessionToolResultAppendsFileEditRow();
+    void testSessionIgnoresEchoedFileEditMarker();
+    void testSessionTruncationKeepsBlockOrder();
+    void testHistorySnapshotReportsUnreadableBlocks();
+    void testSessionUsageLandsOnTheTurn();
+    void testSessionIgnoresEventsFromOtherTurns();
+    void testSessionReportsFailureWithoutStartedTurn();
+    void testSessionIgnoresFailureFromAbandonedTurn();
+    void testSessionTruncateRowsRewritesHistory();
+
+    void testTurnContextCollectsPartsFromPorts();
+    void testTurnContextSkillCommandScanning();
+    void testTurnContextWithoutSkillsPort();
+    void testLinkedFilesHeaderSurvivesUnreadablePaths();
+    void testSystemPromptRenderingWithProject();
+    void testSystemPromptRenderingWithoutProject();
+
+private:
+    Context::DocumentContextReader createReader(const QString &text);
+    QSharedPointer<Settings::CodeCompletionSettings> createSettingsForWholeFile();
+    QSharedPointer<Settings::CodeCompletionSettings> createSettingsForLines(
+        int linesBefore, int linesAfter);
+    static QJsonObject expectedEphemeral(bool extendedTtl);
+};
+
+} // namespace QodeAssist