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cv::Mat testDataMat(1, 2, CV_32FC1, testData); // 1 row, 2 elements

your train set had 10 rows and 2 feature-cols, and your test vec should have 1 row, and 2 cols.

cv::Mat testDataMat(1, 2, CV_32FC1, testData);  // 1 row, 2 elements
testData);