+checkArcArcTangency(aSketchArc1, aSketchArc2)
+assert (model.dof(aSketchFeature) == 14)
+
+#=========================================================================
+# TEST 3. Tangency between non-connected objects should work
+#=========================================================================
+# 3.1 tangency between arc2 and line2
+aSession.startOperation()
+aTangency = aSketchFeature.addFeature("SketchConstraintTangent")
+aRefObjectA = aTangency.refattr("ConstraintEntityA")
+aRefObjectB = aTangency.refattr("ConstraintEntityB")
+anObjectA = modelAPI_ResultConstruction(aSketchArc2.lastResult())
+anObjectB = modelAPI_ResultConstruction(aSketchLine2.lastResult())
+assert (anObjectA is not None)
+assert (anObjectB is not None)
+aRefObjectA.setObject(anObjectA)
+aRefObjectB.setObject(anObjectB)
+aTangency.execute()
+aSession.finishOperation()
+checkArcLineTangency(aSketchArc2, aSketchLine2)
+assert (model.dof(aSketchFeature) == 13)
+
+aSession.startOperation()
+aDocument.removeFeature(aTangency)
+aSession.finishOperation()
+assert (model.dof(aSketchFeature) == 14)
+
+# 3.2 tangency between non-connected arcs
+aSession.startOperation()
+aSketchArc3 = aSketchFeature.addFeature("SketchArc")
+anArc3Centr = geomDataAPI_Point2D(aSketchArc3.attribute("center_point"))
+anArc3Centr.setValue(100., -10.)
+anArc3StartPoint = geomDataAPI_Point2D(aSketchArc3.attribute("start_point"))
+anArc3StartPoint.setValue(70., -10.)
+anArc3EndPoint = geomDataAPI_Point2D(aSketchArc3.attribute("end_point"))
+anArc3EndPoint.setValue(100., 20.)
+aSession.finishOperation()
+assert (model.dof(aSketchFeature) == 19)
+
+aSession.startOperation()
+aTangency = aSketchFeature.addFeature("SketchConstraintTangent")
+aTangency.refattr("ConstraintEntityA").setObject(modelAPI_ResultConstruction(aSketchArc2.lastResult()))
+aTangency.refattr("ConstraintEntityB").setObject(modelAPI_ResultConstruction(aSketchArc3.lastResult()))
+aSession.finishOperation()
+checkArcArcTangency(aSketchArc2, aSketchArc3)
+assert (model.dof(aSketchFeature) == 18)
+
+aSession.startOperation()
+aDocument.removeFeature(aSketchArc3)
+aDocument.removeFeature(aTangency)
+aSession.finishOperation()
+assert (model.dof(aSketchFeature) == 14)
+
+# 3.3 tangency between arc and circle
+aSession.startOperation()
+aCircle1 = aSketchFeature.addFeature("SketchCircle")
+aCircleCenter = geomDataAPI_Point2D(aCircle1.attribute("circle_center"))
+aCircleRadius = aCircle1.real("circle_radius")
+aCircleCenter.setValue(150., 100.)
+aCircleRadius.setValue(50.)
+aSession.finishOperation()
+assert (model.dof(aSketchFeature) == 17)
+
+aSession.startOperation()
+aTangency1 = aSketchFeature.addFeature("SketchConstraintTangent")
+aTangency1.refattr("ConstraintEntityA").setObject(modelAPI_ResultConstruction(aSketchArc2.lastResult()))
+aTangency1.refattr("ConstraintEntityB").setObject(modelAPI_ResultConstruction(aCircle1.lastResult()))
+aSession.finishOperation()
+checkArcArcTangency(aSketchArc2, aCircle1)
+assert (model.dof(aSketchFeature) == 16)
+
+# 3.4 tangency between two circles
+aSession.startOperation()
+aCircle2 = aSketchFeature.addFeature("SketchCircle")
+aCircleCenter = geomDataAPI_Point2D(aCircle2.attribute("circle_center"))
+aCircleRadius = aCircle2.real("circle_radius")
+aCircleCenter.setValue(120., 70.)
+aCircleRadius.setValue(20.)
+aSession.finishOperation()
+assert (model.dof(aSketchFeature) == 19)
+
+aSession.startOperation()
+aTangency2 = aSketchFeature.addFeature("SketchConstraintTangent")
+aTangency2.refattr("ConstraintEntityA").setObject(modelAPI_ResultConstruction(aCircle1.lastResult()))
+aTangency2.refattr("ConstraintEntityB").setObject(modelAPI_ResultConstruction(aCircle2.lastResult()))
+aSession.finishOperation()
+checkArcArcTangency(aCircle1, aCircle2)
+assert (model.dof(aSketchFeature) == 18)