FindOctave: Add module to find GNU octave

Tests/FindOctave/CMakeLists.txt

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+add_test(NAME FindOctave.Test COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindOctave/Test"
+  "${CMake_BINARY_DIR}/Tests/FindOctave/Test"
+  ${build_generator_args}
+  --build-project TestFindOctave
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )

Tests/FindOctave/Test/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.3)
+project(TestFindOctave CXX)
+enable_testing()
+
+find_package(Octave REQUIRED COMPONENTS Development Interpreter)
+
+add_definitions(-DCMAKE_EXPECTED_Octave_VERSION=${Octave_VERSION})
+
+add_executable(test_tgt main.cpp)
+target_link_libraries(test_tgt Octave::Octave)
+add_test(NAME test_tgt COMMAND test_tgt)
+
+add_test(NAME test_tgt_exe
+         COMMAND Octave::Interpreter -q --eval "runtests('.')"
+         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+
+add_executable(test_var main.cpp)
+target_include_directories(test_var PRIVATE ${Octave_INCLUDE_DIRS})
+target_link_libraries(test_var PRIVATE ${Octave_LIBRARIES})
+add_test(NAME test_var COMMAND test_var)

Tests/FindOctave/Test/main.cpp

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+#include <iostream>
+#include <oct.h>
+
+// http://www.dm.unibo.it/~achilles/calc/octave.html/Standalone-Programs.html
+int main(void)
+{
+  int n = 2;
+  Matrix a_matrix = Matrix(n, n);
+  for (octave_idx_type i = 0; i < n; i++) {
+    for (octave_idx_type j = 0; j < n; j++) {
+      a_matrix(i, j) = (i + 1) * 10 + (j + 1);
+    }
+  }
+
+  std::cout << a_matrix << std::endl;
+
+  return EXIT_SUCCESS;
+}

Tests/FindOctave/Test/testtrue.m

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+%!assert(true)