Extend hist/v7 unittests.

hist/hist/v7/unit/add.cxx

@@ -3,12 +3,12 @@
 #include "TH1.h"
 #include "ROOT/THist.h"
 
-// Tests the number of bins
-TEST(AxisTest, NumBins) {
+// Test "x + 0 = x"
+TEST(HistAddTest, AddEmptyHist) {
   EXPECT_EQ(0, 0);
 }
 
-// Tests the axis range
-TEST(AxisTest, RangeFromTo) {
+// Test addition of a hist range
+TEST(HistAddTest, AddView) {
   EXPECT_EQ(1, 1);
 }

hist/hist/v7/unit/axis.cxx

+#include "gtest/gtest.h"
+#include <ROOT/TAxis.h>
+
+using namespace ROOT::Experimental;
+
+// Tests the number of bins
+TEST(AxisTest, NumBins) {
+  constexpr int nOverflow = 2;
+  // Through TAxisConfig
+  {
+    TAxisConfig axis(10, 0., 1.);
+    EXPECT_EQ(10 + nOverflow, axis.GetNBins());
+  }
+
+  {
+    TAxisConfig axis("TITLE", TAxisConfig::Grow, 10, 0., 1.);
+    EXPECT_EQ(10 + nOverflow, axis.GetNBins());
+  }
+
+  {
+    TAxisConfig axis({-0.1, 0.2, 0.5, 10.});
+    EXPECT_EQ(3 + nOverflow, axis.GetNBins());
+  }
+
+  // Through concrete axis incarnations (and to TAxisConfig)
+  {
+    TAxisEquidistant ax("TITLE", 10, -1., 1.);
+    EXPECT_EQ(10 + nOverflow, ax.GetNBins());
+    TAxisConfig axcfg(ax);
+    EXPECT_EQ(ax.GetNBins(), axcfg.GetNBins());
+  }
+
+  {
+    TAxisGrow ax(10, -1., 1.);
+    EXPECT_EQ(10 + nOverflow, ax.GetNBins());
+    TAxisConfig axcfg(ax);
+    EXPECT_EQ(ax.GetNBins(), axcfg.GetNBins());
+  }
+
+  {
+    TAxisIrregular ax("TITLE", {-0.1, 0.2, 0.5, 10.});
+    EXPECT_EQ(3 + nOverflow, ax.GetNBins());
+    TAxisConfig axcfg(ax);
+    EXPECT_EQ(ax.GetNBins(), axcfg.GetNBins());
+  }
+}
+
+TEST(AxisTest, ReverseBinLimits) {
+  {
+    TAxisConfig axiscfg(10, 1., 0.);
+    auto axisEq = Internal::AxisConfigToType<TAxisConfig::kEquidistant>()(axiscfg);
+    EXPECT_DOUBLE_EQ(0., axisEq.GetMinimum());
+    EXPECT_DOUBLE_EQ(1., axisEq.GetMaximum());
+  }
+}

hist/hist/v7/unit/biniter.cxx

+#include "gtest/gtest.h"
+#include <ROOT/THist.h>
+#include <ROOT/THistBinIter.h>
+
+using namespace ROOT::Experimental;
+
+// Tests the number of bins
+TEST(BinIterNBins, NumBins) {
+  TH2F h({10, -1., 1.}, {10, -1., 1.});
+  int nBins = 0;
+  for (auto &&bin: h) {
+    (void)bin;
+    ++nBins;
+  }
+  EXPECT_EQ(h.GetImpl()->GetNBins(), nBins);
+}
+