Build out MATLAB test framework and core integration coverage

Tests/IMDDTestCase.m

@@ -0,0 +1,26 @@
+classdef (Abstract) IMDDTestCase < matlab.unittest.TestCase
+    % Base class for repository tests.
+    % Ensures the relevant project folders are on the MATLAB path so tests
+    % can run both from the Test Browser and from the custom entrypoint.
+
+    methods (TestClassSetup)
+        function addRepositoryPaths(~)
+            root = IMDDTestCase.repoRoot();
+            addpath(root);
+
+            folders = ["Classes", "Functions", "Datatypes", "Libs", "Tests"];
+            for folder = folders
+                fullFolder = fullfile(root, folder);
+                if isfolder(fullFolder)
+                    addpath(genpath(fullFolder));
+                end
+            end
+        end
+    end
+
+    methods (Static, Access = protected)
+        function root = repoRoot()
+            root = fileparts(fileparts(mfilename("fullpath")));
+        end
+    end
+end