function createTestFile(testClassName, targetClassName, targetClassFile, testFilePath)
%CREATETESTFILE Create a placeholder test file for an unimplemented class.

    testClassName = char(testClassName);
    targetClassName = char(targetClassName);
    targetClassFile = char(targetClassFile);
    testFilePath = char(testFilePath);

    fid = fopen(testFilePath, "w");
    assert(fid ~= -1, "Could not create test file: %s", testFilePath);

    cleaner = onCleanup(@() fclose(fid));

    fprintf(fid, "classdef %s < IMDDTestCase\n", testClassName);
    fprintf(fid, "    %% Auto-generated placeholder for %s.\n", targetClassName);
    fprintf(fid, "    %% Target: %s\n\n", strrep(targetClassFile, '\', '/'));
    fprintf(fid, "    methods (Test, TestTags = {'placeholder', 'todo'})\n");
    fprintf(fid, "        function testNotImplemented(testCase)\n");
    fprintf(fid, "            testCase.assumeFail(""Tests for %s are not implemented yet."");\n", targetClassName);
    fprintf(fid, "        end\n");
    fprintf(fid, "    end\n");
    fprintf(fid, "end\n");
end