make tests less sus (#3689)

#### Type of change

- [x] 🤖 Supportability/Tests

#### Test Plan

- [x] ⚡ Unit test

src/internal/m365/graph/errors_test.go

@@ -484,17 +484,17 @@ func (suite *GraphErrorsUnitSuite) TestGraphStack_labels() {
 		{
 			name:   "mysite not found",
 			err:    odErrMsg("code", string(MysiteNotFound)),
-			expect: []string{},
+			expect: []string{LabelsMysiteNotFound},
 		},
 		{
 			name:   "mysite url not found",
 			err:    odErrMsg("code", string(MysiteURLNotFound)),
-			expect: []string{},
+			expect: []string{LabelsMysiteNotFound},
 		},
 		{
 			name:   "no sp license",
 			err:    odErrMsg("code", string(NoSPLicense)),
-			expect: []string{},
+			expect: []string{LabelsNoSharePointLicense},
 		},
 	}
 	for _, test := range table {
@@ -509,6 +509,11 @@ func (suite *GraphErrorsUnitSuite) TestGraphStack_labels() {
 			for _, e := range test.expect {
 				assert.True(t, clues.HasLabel(result, e), clues.ToCore(result))
 			}
+
+			labels := clues.Labels(result)
+			assert.Equal(t,
+				len(test.expect), len(labels),
+				"result should have as many labels as expected")
 		})
 	}
 }