move item struct to be in the exercise instead of generated test file

exercises/practice/knapsack/.meta/gen.go

@@ -39,21 +39,19 @@ var tmpl = `package knapsack
 
 {{.Header}}
 
-type item struct {
-	Weight int
-	Value  int
-}
-
 type maximumValueCaseInput struct {
 	MaximumWeight int
 	Items         []item
 }
 
-var maximumValueTests = []struct {
+type maximumValueTest struct {
 	description string       
 	input       maximumValueCaseInput
 	expected    int
-}{ {{range .J.maximumValue}}
+}	
+
+var maximumValueTests = []maximumValueTest { 
+	{{range .J.maximumValue}}
 		{
 			description: {{printf "%q" .Description}},
 			input: maximumValueCaseInput {

exercises/practice/knapsack/cases_test.go

@@ -5,21 +5,19 @@ package knapsack
 // Source: exercism/problem-specifications
 // Commit: 6c1d8e2 Knapsack: Fix empty list of items (#2350)
 
-type item struct {
-	Weight int
-	Value  int
-}
-
 type maximumValueCaseInput struct {
 	MaximumWeight int
 	Items         []item
 }
 
-var maximumValueTests = []struct {
+type maximumValueTest struct {
 	description string
 	input       maximumValueCaseInput
 	expected    int
-}{
+}
+
+var maximumValueTests = []maximumValueTest{
+
 	{
 		description: "no items",
 		input: maximumValueCaseInput{

exercises/practice/knapsack/knapsack.go

@@ -1,5 +1,9 @@
 package knapsack
 
+type item struct {
+	Weight, Value int
+}
+
 func Knapsack(maximumWeight int, items []item) int {
 	return 0
 }