codegen: fix test generator hardcoding test string in multiple places

pkg/codegen/modelgenerate/generate_testfile.go

@@ -108,7 +108,7 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 						Rhs: []ast.Expr{
 							&ast.BasicLit{
 								Kind:  token.STRING,
-								Value: `"an item"`,
+								Value: fmt.Sprintf("%q", description1),
 							},
 						},
 					},
@@ -148,12 +148,12 @@ func GenerateModelTestAST(tbl pkgschema.Table, schema pkgschema.Schema, gomodNam
 						})},
 					},
 
-					// assert.Equal(t, "an item", item2.Description)
+					// assert.Equal(t, item.Description, item2.Description)
 					&ast.ExprStmt{X: &ast.CallExpr{
 						Fun: &ast.SelectorExpr{X: ast.NewIdent("assert"), Sel: ast.NewIdent("Equal")},
 						Args: []ast.Expr{
 							ast.NewIdent("t"),
-							&ast.BasicLit{Kind: token.STRING, Value: description1},
+							&ast.SelectorExpr{X: testObj, Sel: fieldName},
 							&ast.SelectorExpr{X: testObj2, Sel: fieldName},
 						},
 					}},