[test] Add a test for QgsSQLiteExpressionCompiler

Author: elpaso

tests/src/core/testqgssqliteexpressioncompiler.cpp

@@ -0,0 +1,111 @@
+/***************************************************************************
+
+ testqgssqliteexpressioncompiler.cpp
+
+ ---------------------
+ begin                : 14.8.2018
+ copyright            : (C) 2018 by Alessandro Pasotti
+ email                : elpaso at itopen dot it
+ ***************************************************************************
+ *                                                                         *
+ *   This program 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 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+#include "qgstest.h"
+
+
+#include <qgsapplication.h>
+//header for class being tested
+#include "qgsexpression.h"
+#include "qgsvectorlayer.h"
+#include "qgsproject.h"
+#include "qgssqliteexpressioncompiler.h"
+
+class TestQgsSQLiteExpressionCompiler: public QObject
+{
+    Q_OBJECT
+
+  public:
+
+    TestQgsSQLiteExpressionCompiler() = default;
+
+    QgsExpression makeExpression( const int length );
+
+
+  private slots:
+
+    void initTestCase();
+    void cleanupTestCase();
+    void testMakeExpression();
+    void testCompiler();
+
+  private:
+
+    QgsVectorLayer *mPointsLayer = nullptr;
+};
+
+
+
+QgsExpression TestQgsSQLiteExpressionCompiler::makeExpression( const int length )
+{
+  QStringList expString;
+  for ( int i = 0; i < length; ++i )
+  {
+    expString.append( QStringLiteral( "(\"Z\" >= %1) AND (\"Bottom\" <= %2)" ).arg( i ).arg( i + 1 ) );
+  }
+  QgsExpression exp( expString.join( QStringLiteral( ") OR (" ) ).prepend( '(' ).append( ')' ) );
+  return exp;
+}
+
+void TestQgsSQLiteExpressionCompiler::initTestCase()
+{
+  //
+  // Runs once before any tests are run
+  //
+  // init QGIS's paths - true means that all path will be inited from prefix
+  QgsApplication::init();
+  QgsApplication::initQgis();
+  // Will make sure the settings dir with the style file for color ramp is created
+  QgsApplication::createDatabase();
+  QgsApplication::showSettings();
+  //create a point layer that will be used in all tests...
+  mPointsLayer = new QgsVectorLayer( QStringLiteral( "Point?crs=epsg:4326&field=Z:integer&field=Bottom:integer" ), QStringLiteral( "test mem layer" ), QStringLiteral( "memory" ) );
+  QgsProject::instance()->addMapLayer( mPointsLayer );
+}
+
+void TestQgsSQLiteExpressionCompiler::cleanupTestCase()
+{
+  QgsApplication::exitQgis();
+}
+
+void TestQgsSQLiteExpressionCompiler::testMakeExpression()
+{
+  QgsExpression exp( makeExpression( 1 ) );
+  QVERIFY( exp.isValid() );
+  QCOMPARE( QString( exp ), QString( "((\"Z\" >= 0) AND (\"Bottom\" <= 1))" ) );
+  QgsExpression exp2( makeExpression( 2 ) );
+  QVERIFY( exp2.isValid() );
+  QCOMPARE( QString( exp2 ), QString( "((\"Z\" >= 0) AND (\"Bottom\" <= 1)) OR ((\"Z\" >= 1) AND (\"Bottom\" <= 2))" ) );
+}
+
+void TestQgsSQLiteExpressionCompiler::testCompiler()
+{
+  QgsSQLiteExpressionCompiler compiler = QgsSQLiteExpressionCompiler( mPointsLayer->fields() );
+  QgsExpression exp( makeExpression( 1 ) );
+  QCOMPARE( compiler.compile( &exp ), QgsSqlExpressionCompiler::Result::Complete );
+  QCOMPARE( compiler.result(), QString( exp ) );
+  exp = makeExpression( 3 );
+  QCOMPARE( compiler.compile( &exp ), QgsSqlExpressionCompiler::Result::Complete );
+  // Check that parenthesis matches
+  QCOMPARE( compiler.result().count( '(' ),  compiler.result().count( ')' ) );
+  QCOMPARE( compiler.result(), QString( "((((\"Z\" >= 0) AND (\"Bottom\" <= 1)) OR ((\"Z\" >= 1) AND (\"Bottom\" <= 2))) OR ((\"Z\" >= 2) AND (\"Bottom\" <= 3)))" ) );
+}
+
+
+
+QGSTEST_MAIN( TestQgsSQLiteExpressionCompiler )
+
+#include "testqgssqliteexpressioncompiler.moc"