add tests for QgsColorRamp

tests/src/python/CMakeLists.txt

@@ -28,6 +28,7 @@ ADD_PYTHON_TEST(PyQgsBox3d test_qgsbox3d.py)
 ADD_PYTHON_TEST(PyQgsCategorizedSymbolRenderer test_qgscategorizedsymbolrenderer.py)
 ADD_PYTHON_TEST(PyQgsCheckableComboBox test_qgscheckablecombobox.py)
 ADD_PYTHON_TEST(PyQgsColorButton test_qgscolorbutton.py)
+ADD_PYTHON_TEST(PyQgsColorRamp test_qgscolorramp.py)
 ADD_PYTHON_TEST(PyQgsColorScheme test_qgscolorscheme.py)
 ADD_PYTHON_TEST(PyQgsColorSchemeRegistry test_qgscolorschemeregistry.py)
 ADD_PYTHON_TEST(PyQgsCoordinateFormatter test_qgscoordinateformatter.py)

tests/src/python/test_qgscolorramp.py

@@ -0,0 +1,103 @@
+# -*- coding: utf-8 -*-
+"""QGIS Unit tests for QgsColorRamp subclasses.
+
+.. note:: 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.
+"""
+__author__ = 'Alexander Bruy'
+__date__ = '26/05/2019'
+__copyright__ = 'Copyright 2019, The QGIS Project'
+
+import qgis  # NOQA
+
+from qgis.testing import unittest, start_app
+from qgis.core import QgsColorBrewerColorRamp, QgsCptCityColorRamp, QgsGradientColorRamp, QgsSettings, QgsApplication
+from qgis.PyQt.QtCore import QCoreApplication
+from qgis.PyQt.QtGui import QColor
+
+
+class TestQgsColorRamp(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        """Run before all tests"""
+        QCoreApplication.setOrganizationName("QGIS_Test")
+        QCoreApplication.setOrganizationDomain("QGIS_TestQgsColorRamp.com")
+        QCoreApplication.setApplicationName("QGIS_TestQgsColorRamp")
+        QgsSettings().clear()
+        start_app()
+
+    def testColorBrewerColorRamp(self):
+        """Test Color Brewer color ramp"""
+        ramp = QgsColorBrewerColorRamp(schemeName="Spectral", colors=5, inverted=False)
+        self.assertTrue(ramp)
+
+        # color scheme name
+        self.assertEqual(ramp.schemeName(), "Spectral")
+
+        # number of colors
+        self.assertEqual(ramp.colors(), 5)
+        ramp.setColors(13)
+        self.assertEqual(ramp.colors(), 13)
+
+        # color for value
+        ramp.setColors(5)
+        self.assertEqual(ramp.color(0).name(), "#d7191c")
+        self.assertEqual(ramp.color(1).name(), "#2b83ba")
+        self.assertEqual(ramp.color(0.5).name(), "#ffffbf")
+        self.assertEqual(ramp.color(2).name(), "#000000")
+        self.assertEqual(ramp.color(-1).name(), "#000000")
+        self.assertEqual(ramp.color(float('nan')).name(), "#000000")
+
+    def testCptCityColorRamp(self):
+        """Test Cpt-city color ramp"""
+        ramp = QgsCptCityColorRamp(schemeName="cb/div/BrBG_", variantName="05", inverted=False)
+        self.assertTrue(ramp)
+
+        # associated files
+        self.assertTrue(ramp.fileLoaded())
+        fileName = ramp.fileName()[len(QgsApplication.pkgDataPath()):]
+        self.assertEqual(fileName, "/resources/cpt-city-qgis-min/cb/div/BrBG_05.svg")
+        fileName = ramp.copyingFileName()[len(QgsApplication.pkgDataPath()):]
+        self.assertEqual(fileName, "/resources/cpt-city-qgis-min/cb/COPYING.xml")
+        fileName = ramp.descFileName()[len(QgsApplication.pkgDataPath()):]
+        self.assertEqual(fileName, "/resources/cpt-city-qgis-min/cb/div/DESC.xml")
+
+        # color scheme name
+        self.assertEqual(ramp.schemeName(), "cb/div/BrBG_")
+        self.assertEqual(ramp.variantName(), "05")
+
+        # number of colors
+        self.assertEqual(ramp.count(), 6)
+
+        # color for value
+        self.assertEqual(ramp.color(0).name(), "#a6611a")
+        self.assertEqual(ramp.color(1).name(), "#018571")
+        self.assertEqual(ramp.color(0.5).name(), "#f5f5f5")
+        self.assertEqual(ramp.color(2).name(), "#018571")
+        self.assertEqual(ramp.color(-1).name(), "#a6611a")
+        self.assertEqual(ramp.color(float('nan')).name(), "#018571")
+
+    def testGradientColorRamp(self):
+        """Test gradient color ramp"""
+        ramp = QgsGradientColorRamp(color1=QColor(0, 0, 255), color2=QColor(0, 255, 0), discrete=False)
+        self.assertTrue(ramp)
+
+        # number of colors
+        self.assertEqual(ramp.count(), 2)
+        self.assertEqual(ramp.color1().name(), "#0000ff")
+        self.assertEqual(ramp.color2().name(), "#00ff00")
+
+        # color for value
+        self.assertEqual(ramp.color(0).name(), "#0000ff")
+        self.assertEqual(ramp.color(1).name(), "#00ff00")
+        self.assertEqual(ramp.color(0.5).name(), "#008080")
+        self.assertEqual(ramp.color(2).name(), "#00ff00")
+        self.assertEqual(ramp.color(-1).name(), "#0000ff")
+        self.assertEqual(ramp.color(float('nan')).name(), "#00ff00")
+
+
+if __name__ == "__main__":
+    unittest.main()