Add float64_axis.

testing/float64_axis.cu

@@ -1,4 +1,40 @@
-//
-// Created by allie on 12/22/2020.
-//
+#include <nvbench/float64_axis.cuh>
 
+#include "test_asserts.cuh"
+
+void test_empty()
+{
+  nvbench::float64_axis axis("Empty");
+  ASSERT(axis.get_name() == "Empty");
+  ASSERT(axis.get_type() == nvbench::axis_type::float64);
+  ASSERT(axis.get_size() == 0);
+
+  axis.set_inputs({});
+
+  ASSERT(axis.get_size() == 0);
+}
+
+void test_basic()
+{
+  nvbench::float64_axis axis("Basic");
+  ASSERT(axis.get_name() == "Basic");
+
+  axis.set_inputs({-100.3, 0., 2064.15});
+
+  ASSERT(axis.get_size() == 3);
+  ASSERT(axis.get_value(0) == -100.3);
+  ASSERT(axis.get_input_string(0) == "-100.3");
+  ASSERT(axis.get_description(0) == "");
+  ASSERT(axis.get_value(1) == 0.);
+  ASSERT(axis.get_input_string(1) == "0");
+  ASSERT(axis.get_description(1) == "");
+  ASSERT(axis.get_value(2) == 2064.15);
+  ASSERT(axis.get_input_string(2) == "2064.15");
+  ASSERT(axis.get_description(2) == "");
+}
+
+int main()
+{
+  test_empty();
+  test_basic();
+}