treewide: parallel tests

Most tests already had no global state, however parallel was never enabled. This change enables it for all applicable tests.

Signed-off-by: Ophestra <cat@gensokyo.uk>

system/dispatcher_test.go

@@ -42,10 +42,12 @@ func checkOpBehaviour(t *testing.T, testCases []opBehaviourTestCase) {
 
 	t.Run("behaviour", func(t *testing.T) {
 		t.Helper()
+		t.Parallel()
 
 		for _, tc := range testCases {
 			t.Run(tc.name, func(t *testing.T) {
 				t.Helper()
+				t.Parallel()
 
 				var ec *Criteria
 				if tc.ec != 0xff {
@@ -94,10 +96,12 @@ func checkOpsBuilder(t *testing.T, fname string, testCases []opsBuilderTestCase)
 
 	t.Run("build", func(t *testing.T) {
 		t.Helper()
+		t.Parallel()
 
 		for _, tc := range testCases {
 			t.Run(tc.name, func(t *testing.T) {
 				t.Helper()
+				t.Parallel()
 
 				sys, s := InternalNew(t, tc.exp, tc.uid)
 				defer stub.HandleExit(t)
@@ -126,10 +130,12 @@ func checkOpIs(t *testing.T, testCases []opIsTestCase) {
 
 	t.Run("is", func(t *testing.T) {
 		t.Helper()
+		t.Parallel()
 
 		for _, tc := range testCases {
 			t.Run(tc.name, func(t *testing.T) {
 				t.Helper()
+				t.Parallel()
 
 				if got := tc.op.Is(tc.v); got != tc.want {
 					t.Errorf("Is: %v, want %v", got, tc.want)
@@ -153,10 +159,12 @@ func checkOpMeta(t *testing.T, testCases []opMetaTestCase) {
 
 	t.Run("meta", func(t *testing.T) {
 		t.Helper()
+		t.Parallel()
 
 		for _, tc := range testCases {
 			t.Run(tc.name, func(t *testing.T) {
 				t.Helper()
+				t.Parallel()
 
 				t.Run("type", func(t *testing.T) {
 					t.Helper()