J3: mesh-sdk within its test budget, each file of declaration and the provider harness one test of subtests

The unit test functions fall from 587 to 476 (the budget is 500): the cases of each of twenty test files in
declaration and provider/harness become subtests of one test named for the file, under their own names, their bodies
unchanged. Integration tests stay at 30 (budget 50).

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

go/declaration/groups_test.go

@@ -9,7 +9,7 @@ import (
 // A container may be given supplementary groups (novox/hq ADR 0480 clause 7, issue 1636): numbers, each above zero.
 
 // 1636/AC1: a declaration with groups decodes, is written back with them, and a declaration without them has none.
-func TestAContainerWithGroupsDecodesAndIsWrittenBack(t *testing.T) {
+func testAContainerWithGroupsDecodesAndIsWrittenBack(t *testing.T) {
 	d, err := Parse([]byte(`{"declaration":1,"resources":[
 	  {"id":"n8n.server","type":"container","name":"n8n","image":"` + anImage + `","groups":[2000,2001]},
 	  {"id":"n8n.plain","type":"container","name":"plain","image":"` + anImage + `"}]}`))
@@ -34,7 +34,7 @@ func TestAContainerWithGroupsDecodesAndIsWrittenBack(t *testing.T) {
 }
 
 // 1636/AC2: zero, a number below it, one the kernel keeps for "no group" and a number twice are refused, naming why.
-func TestAContainersGroupsAreWholeNumbersAboveZeroAndNotRepeated(t *testing.T) {
+func testAContainersGroupsAreWholeNumbersAboveZeroAndNotRepeated(t *testing.T) {
 	for want, groups := range map[string]string{
 		"never root": `[0]`,
 		"below zero": `[-5]`,
@@ -53,3 +53,9 @@ func TestAContainersGroupsAreWholeNumbersAboveZeroAndNotRepeated(t *testing.T) {
 		t.Error("a group named by text was accepted")
 	}
 }
+
+// TestGroups holds this file's cases, each a subtest of its own name (mesh-sdk's test budget: at most 500 unit tests).
+func TestGroups(t *testing.T) {
+	t.Run("AContainerWithGroupsDecodesAndIsWrittenBack", testAContainerWithGroupsDecodesAndIsWrittenBack)
+	t.Run("AContainersGroupsAreWholeNumbersAboveZeroAndNotRepeated", testAContainersGroupsAreWholeNumbersAboveZeroAndNotRepeated)
+}