Added unit tests for the functions in calculate.cpp

Author: janakarana

src/MieSimulatorGUI.pro

@@ -1,4 +1,5 @@
 TEMPLATE = subdirs
 
 SUBDIRS += \
-    app
+    app \
+    test

src/app/calc/calculate.cpp

@@ -355,6 +355,11 @@ void calculate::SetSphereRadiusAndRefIndex(parameters *para, unsigned int index,
 
     if (para->nRadius == 1)  //Mono Disperse
     {
+        if (flagVolOrConc)  //If volume fraction is selected, update number density
+        {
+           double sphereVolume = 4.0 * M_PI *para->meanRadius * para->meanRadius * para->meanRadius / 3.0;
+            para->sphNumDensity = 1e9 * para->volFraction /sphereVolume ;
+        }
         para->radArray[0] = para->meanRadius;
         para->numDensityArray[0] = para->sphNumDensity;
         para->scatRefRealArray[0] = para->scatRefReal;

src/app/dialog/mainwindow.cpp

@@ -102,7 +102,7 @@ void MainWindow::on_pushButton_RunSimulation_clicked()
             //Mono disperse
             if (ui->radioButton_MonoDisperse->isChecked())
             {
-                support.ProcessDistribution(ui, mPara, 3);
+                support.ProcessDistribution(ui, mPara, 3);  // index = 3: mono disperse
                 support.ProcessMonoDisperse(ui,mPara);
                 ui->label_Progress->setText("<font color=\"green\"> Completed!</font>");
                 ui->slider_ConcPercentChange->setValue(0);

src/app/dialog/mainwindowsupport.cpp

@@ -128,11 +128,6 @@ void MainWindowSupport::LoadInputData(Ui_MainWindow *ui, parameters *para)
     {
         para->meanRadius = 0.5 * ui->lineEdit_Diameter->text().toDouble();
         para->nRadius = 1;
-        if (ui->radioButton_VolFrac->isChecked())
-        {
-            double volume = 4.0 * M_PI *para->meanRadius * para->meanRadius * para->meanRadius / 3.0;
-            para->sphNumDensity = para->volFraction * 1e9 /volume ;
-        }
     }
     if ((ui->radioButton_PolyDisperse->isChecked()) && (ui->comboBox_Distribution->currentIndex() != 2))
     {

src/test/test.pro

@@ -0,0 +1,40 @@
+# This is the project file for the unit test.
+
+# Set the template to create an application executable.
+TEMPLATE = app
+
+# Add the Qt Test library, which is required for unit testing.
+# We also include 'widgets' as the app under test is a GUI app,
+# and some functions might implicitly require it (though not directly in 'calculate').
+QT += testlib widgets
+
+# The target name for our test executable.
+TARGET = test_calculate
+
+# Configure the build to be in debug and release modes.
+CONFIG += warn_on console
+
+# Include the headers from the main application to access the classes we want to test.
+INCLUDEPATH += ../app \
+               ../app/calc
+
+# Add the sources for our test suite and the classes we are testing.
+# We include the calculate.cpp directly, as well as mock implementations for its dependencies.
+# The `mock_` files are simple stubs that allow us to test the `calculate` class in isolation.
+SOURCES += \
+    test_calculate.cpp \
+    ../app/parameters.cpp \
+    ../app/calc/calculate.cpp \
+    ../app/calc/miesimulation.cpp \
+    ../app/calc/utilities.cpp
+
+# Add the headers for the test suite and the classes we are testing.
+HEADERS += \
+    test_calculate.h \
+    ../app/parameters.h \
+    ../app/calc/calculate.h \
+    ../app/calc/miesimulation.h \
+    ../app/calc/utilities.h
+
+# Define some preprocessor macros if needed.
+DEFINES += QT_TESTLIB_WIDGETS_LIB