Pass "this" object when evaluating debug jobs

We have to explicitly specify the "this" object on QV4::Function::call,
otherwise it will assume undefined or the QML global object.

Task-number: QTBUG-66942
Change-Id: I1af7742b4fee1b49e9760a413834daf3edb15d74
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/auto/qml/debugger/qv4debugger/tst_qv4debugger.cpp b/tests/auto/qml/debugger/qv4debugger/tst_qv4debugger.cpp
index 5dd62da15a..4ce0f9fd89 100644
--- a/tests/auto/qml/debugger/qv4debugger/tst_qv4debugger.cpp
+++ b/tests/auto/qml/debugger/qv4debugger/tst_qv4debugger.cpp
@@ -316,6 +316,8 @@ private slots:
 
     void lastLineOfConditional_data();
     void lastLineOfConditional();
+
+    void readThis();
 private:
     QV4Debugger *debugger() const
     {
@@ -865,6 +867,36 @@ void tst_qv4debugger::lastLineOfConditional()
     QCOMPARE(secondState.lineNumber, lastLine);
 }
 
+void tst_qv4debugger::readThis()
+{
+    m_debuggerAgent->m_captureContextInfo = true;
+    QString script =
+            "var x = function() {\n"
+            "    return this.a;\n"
+            "}.apply({a : 5}, []);\n";
+
+    TestAgent::ExpressionRequest request;
+    request.expression = "this";
+    request.frameNr = 0;
+    request.context = -1; // no extra context
+    m_debuggerAgent->m_expressionRequests << request;
+
+    debugger()->addBreakPoint("applyThis", 2);
+    evaluateJavaScript(script, "applyThis");
+    QVERIFY(m_debuggerAgent->m_wasPaused);
+
+    QCOMPARE(m_debuggerAgent->m_expressionResults.count(), 1);
+    QJsonObject result0 = m_debuggerAgent->m_expressionResults[0];
+    QCOMPARE(result0.value("type").toString(), QStringLiteral("object"));
+    QCOMPARE(result0.value("value").toInt(), 1);
+    QJsonArray properties = result0.value("properties").toArray();
+    QCOMPARE(properties.size(), 1);
+    QJsonObject a = properties.first().toObject();
+    QCOMPARE(a.value("name").toString(), QStringLiteral("a"));
+    QCOMPARE(a.value("type").toString(), QStringLiteral("number"));
+    QCOMPARE(a.value("value").toInt(), 5);
+}
+
 void tst_qv4debugger::redundancy_data()
 {
     QTest::addColumn<bool>("redundantRefs");