Add unit testing framework and tests for existing code (and assorted fixes and breaking API changes)

meson.build

@@ -3,4 +3,9 @@ project('jml', 'cpp',
 
 core_inc = include_directories('core/include')
 
+catch2_proj = subproject('catch2', default_options: {'tests': false})
+catch2_dep = catch2_proj.get_variable('catch2_with_main_dep')
+
 subdir('core')
+
+subdir('tests')

subprojects/catch2.wrap

@@ -0,0 +1,11 @@
+[wrap-file]
+directory = Catch2-3.4.0
+source_url = https://github.com/catchorg/Catch2/archive/v3.4.0.tar.gz
+source_filename = Catch2-3.4.0.tar.gz
+source_hash = 122928b814b75717316c71af69bd2b43387643ba076a6ec16e7882bfb2dfacbb
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/catch2_3.4.0-1/Catch2-3.4.0.tar.gz
+wrapdb_version = 3.4.0-1
+
+[provide]
+catch2 = catch2_dep
+catch2-with-main = catch2_with_main_dep

tests/core.cpp

@@ -0,0 +1,5 @@
+#include "catch2/catch_test_macros.hpp"
+
+TEST_CASE("Check sanity with 1 equals 1", "[useless]") {
+    REQUIRE(1 == 1);
+}

tests/math/matrix.cpp

@@ -0,0 +1,5 @@
+#include "catch2/catch_test_macros.hpp"
+
+TEST_CASE("nothing yet", "[math]") {
+    REQUIRE(2 == 2);
+}

tests/meson.build

@@ -0,0 +1,4 @@
+test_sources = ['core.cpp',
+                'math/matrix.cpp']
+tests = executable('tests', test_sources, dependencies: [catch2_dep])
+test('tests', tests, args: ['--reporter', 'TAP'], protocol: 'tap')