[hist] Add test file for TProfiles, testing Chi2Test().

Author: hageboeck

hist/hist/test/CMakeLists.txt

@@ -29,6 +29,7 @@ ROOT_ADD_GTEST(testTGraphSorting test_TGraph_sorting.cxx LIBRARIES Hist)
 ROOT_ADD_GTEST(testSpline test_spline.cxx LIBRARIES Hist)
 ROOT_ADD_GTEST(testTF1Simple test_tf1_simple.cxx LIBRARIES Hist RIO)
 ROOT_ADD_GTEST(testTF1DrawCopy test_tf1_drawcopy.cxx LIBRARIES Hist)
+ROOT_ADD_GTEST(test_TProfile test_TProfile.cxx LIBRARIES Hist)
 
 if(fftw3)
   ROOT_ADD_GTEST(testTF1 test_tf1.cxx LIBRARIES Hist)

hist/hist/test/test_TProfile.cxx

@@ -0,0 +1,91 @@
+#include "gtest/gtest.h"
+
+#include "TProfile.h"
+#include "TProfile2D.h"
+#include "TProfile3D.h"
+#include "TRandom.h"
+
+#include "ROOT/TestSupport.hxx"
+
+template <typename T>
+void runTest(T const &reference, T const &sameDistr, T const &differentDistr)
+{
+   EXPECT_EQ(reference.Chi2Test(&sameDistr), reference.Chi2Test(&sameDistr, "WW"));
+   EXPECT_EQ(reference.Chi2Test(&sameDistr),
+             reference.Chi2Test(&sameDistr, "P WW UW")); // Need more than just the default option
+   EXPECT_EQ(reference.Chi2Test(&sameDistr), reference.Chi2Test(&sameDistr, "UW"));
+   EXPECT_EQ(reference.Chi2Test(&sameDistr), reference.Chi2Test(&sameDistr, "UU"));
+   EXPECT_EQ(reference.Chi2Test(&sameDistr), reference.Chi2Test(&sameDistr, "P UU"));
+
+   const double probSuccess = reference.Chi2Test(&sameDistr, "P");
+   EXPECT_GT(probSuccess, 0.1);
+   EXPECT_LE(probSuccess, 1.);
+   const double probFail = reference.Chi2Test(&differentDistr, "P");
+   EXPECT_LT(probFail, 0.05);
+}
+
+TEST(TProfile, Chi2Test)
+{
+   TProfile reference("reference", "reference", 10, 0, 10);
+   TProfile sameDistr("sameDistr", "sameDistr", 10, 0, 10);
+   TProfile differentDistr("differentDistr", "differentDistr", 10, 0, 10);
+
+   for (unsigned int i = 0; i < 100000; i++) {
+      const double x = gRandom->Uniform(10.);
+      reference.Fill(x, gRandom->Gaus(5 + x / 2, 5.));
+      sameDistr.Fill(x, gRandom->Gaus(5 + x / 2, 5.));
+      differentDistr.Fill(x, gRandom->Gaus(20, 1.));
+   }
+
+   runTest(reference, sameDistr, differentDistr);
+}
+
+TEST(TProfile, Chi2TestWithWrongErrors)
+{
+   TProfile reference("reference", "reference", 10, 0, 10);
+   reference.Fill(1, 2);
+   reference.Fill(1, 3);
+
+   for (auto err : {"s", "i", "g"}) {
+      ROOT::TestSupport::CheckDiagsRAII checkDiag(kWarning, "TProfile::Chi2Test", "if the error on the mean is used",
+                                                  false);
+
+      TProfile sameDistr("sameDistr", "sameDistr", 10, 0, 10, err);
+      sameDistr.Fill(1, 2);
+      sameDistr.Fill(1, 3);
+
+      reference.Chi2Test(&sameDistr);
+   }
+}
+
+TEST(TProfile2D, Chi2Test)
+{
+   TProfile2D reference("reference", "reference", 10, 0, 10, 10, 0, 10);
+   TProfile2D sameDistr("sameDistr", "sameDistr", 10, 0, 10, 10, 0, 10);
+   TProfile2D differentDistr("differentDistr", "differentDistr", 10, 0, 10, 10, 0, 10);
+
+   for (unsigned int i = 0; i < 50000; i++) {
+      const double x = gRandom->Uniform(10.);
+      reference.Fill(x, x + 1., gRandom->Gaus(5 + x / 2, 5.));
+      sameDistr.Fill(x, x + 1., gRandom->Gaus(5 + x / 2, 5.));
+      differentDistr.Fill(x, x + 1., gRandom->Gaus(20, 1.));
+   }
+
+   runTest(reference, sameDistr, differentDistr);
+}
+
+TEST(TProfile3D, Chi2Test)
+{
+   TProfile3D reference("reference", "reference", 10, 0, 10, 11, 0, 11, 12, 0, 12);
+   TProfile3D sameDistr("sameDistr", "sameDistr", 10, 0, 10, 11, 0, 11, 12, 0, 12);
+   TProfile3D differentDistr("differentDistr", "differentDistr", 10, 0, 10, 11, 0, 11, 12, 0, 12);
+
+   for (unsigned int i = 0; i < 50000; i++) {
+      const double x = gRandom->Uniform(10.);
+      reference.Fill(x, x + 1., x + 2., gRandom->Gaus(5 + x / 2, 5.));
+      sameDistr.Fill(x, x + 1., x + 2., gRandom->Gaus(5 + x / 2, 5.));
+      differentDistr.Fill(x, x + 1., x + 2., gRandom->Gaus(20, 1.));
+   }
+
+   runTest(reference, sameDistr, differentDistr);
+}