[tests] Add some tests for 9 cells algorithms

Note: this does not test the correctness of the
algorithms but only that the filters are correctly
working.

tests/src/analysis/CMakeLists.txt

@@ -76,6 +76,7 @@ SET(TESTS
  testqgsrastercalculator.cpp
  testqgsalignraster.cpp
  testqgsnetworkanalysis.cpp
+ testqgsninecellfilters.cpp
     )
 
 FOREACH(TESTSRC ${TESTS})

tests/src/analysis/testqgsninecellfilters.cpp

@@ -0,0 +1,133 @@
+/***************************************************************************
+  testninecellfilters.cpp
+  --------------------------------------
+  Date                 : April 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 "qgsalignraster.h"
+#include "qgsaspectfilter.h"
+#include "qgsslopefilter.h"
+#include "qgshillshadefilter.h"
+#include "qgsruggednessfilter.h"
+#include "qgstotalcurvaturefilter.h"
+#include "qgsapplication.h"
+
+#include <QDir>
+
+
+class TestNineCellFilters : public QObject
+{
+    Q_OBJECT
+
+    QString SRC_FILE;
+  private slots:
+
+    void initTestCase();
+    void testSlope();
+    void testAspect();
+    void testHillshade();
+    void testRuggedness();
+    void testTotalCurvature();
+
+  private:
+
+    template <class T> void _testAlg( const QString &name );
+
+    static QString referenceFile( const QString &name )
+    {
+      return QStringLiteral( "%1/analysis/%2.tif" ).arg( TEST_DATA_DIR, name );
+    }
+
+    static QString tempFile( const QString &name )
+    {
+      return QStringLiteral( "%1/ninecellfilterstest-%2.tif" ).arg( QDir::tempPath(), name );
+    }
+};
+
+
+
+void TestNineCellFilters::initTestCase()
+{
+  GDALAllRegister();
+
+  SRC_FILE = QStringLiteral( TEST_DATA_DIR ) + "/analysis/dem.tif";
+  QgsApplication::init(); // needed for CRS database
+}
+
+template <class T>
+void TestNineCellFilters::_testAlg( const QString &name )
+{
+  QString tmpFile( tempFile( name ) );
+  QString refFile( referenceFile( name ) );
+
+  QgsAlignRaster::RasterInfo in( SRC_FILE );
+  QSize inSize( in.rasterSize() );
+  QSizeF inCellSize( in.cellSize( ) );
+  T slopefilter( SRC_FILE, tmpFile, "GTiff" );
+  int res = slopefilter.processRaster();
+  QVERIFY( res == 0 );
+
+  // Produced file
+  QgsAlignRaster::RasterInfo out( tmpFile );
+  QVERIFY( out.isValid() );
+
+  // Reference file
+  QgsAlignRaster::RasterInfo ref( refFile );
+  QSize refSize( ref.rasterSize() );
+  QSizeF refCellSize( ref.cellSize( ) );
+
+  QCOMPARE( out.rasterSize(), inSize );
+  QCOMPARE( out.cellSize(), inCellSize );
+  QCOMPARE( out.rasterSize(), refSize );
+  QCOMPARE( out.cellSize(), refCellSize );
+
+  double refId1( ref.identify( 4081812, 2431750 ) );
+  double refId2( ref.identify( 4081312, 2431350 ) );
+  QCOMPARE( out.identify( 4081812, 2431750 ), refId1 );
+  QCOMPARE( out.identify( 4081312, 2431350 ),  refId2 );
+
+}
+
+
+void TestNineCellFilters::testSlope()
+{
+  _testAlg<QgsSlopeFilter>( QStringLiteral( "slope" ) );
+}
+
+
+void TestNineCellFilters::testAspect()
+{
+  _testAlg<QgsAspectFilter>( QStringLiteral( "aspect" ) );
+}
+
+
+void TestNineCellFilters::testHillshade()
+{
+  _testAlg<QgsHillshadeFilter>( QStringLiteral( "hillshade" ) );
+}
+
+
+void TestNineCellFilters::testRuggedness()
+{
+  _testAlg<QgsRuggednessFilter>( QStringLiteral( "ruggedness" ) );
+}
+
+
+void TestNineCellFilters::testTotalCurvature()
+{
+  _testAlg<QgsTotalCurvatureFilter>( QStringLiteral( "totalcurvature" ) );
+}
+
+QGSTEST_MAIN( TestNineCellFilters )
+
+#include "testqgsninecellfilters.moc"