The term 'TEST FOR QUALITY' can be summarized by the crossword solution 'ASSAY'. An ASSAY is a process of testing or analyzing a material, such as a chemical or mineral, to determine its composition or quality. It is often used in the context of determining the purity of a substance, or to measure the amount of a particular component in a sample. Assays are also used to test for the presence of contaminants or other substances that may affect the quality of a product.