Fix data race in bulk import tests (#24897)

server/channels/store/sqlstore/context_test.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"testing"
 
+	"github.com/mattermost/mattermost/server/public/shared/request"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -16,3 +17,48 @@ func TestContextMaster(t *testing.T) {
 	m := WithMaster(ctx)
 	assert.True(t, HasMaster(m))
 }
+
+func TestRequestContextWithMaster(t *testing.T) {
+	t.Run("set and get", func(t *testing.T) {
+		var rctx request.CTX = request.TestContext(t)
+
+		rctx = RequestContextWithMaster(rctx)
+		assert.True(t, HasMaster(rctx.Context()))
+	})
+
+	t.Run("directly assigning does cause the child to alter the parent", func(t *testing.T) {
+		var rctx request.CTX = request.TestContext(t)
+		rctxClone := rctx
+		rctxClone = RequestContextWithMaster(rctxClone)
+
+		assert.True(t, HasMaster(rctx.Context()))
+		assert.True(t, HasMaster(rctxClone.Context()))
+	})
+
+	t.Run("values get copied from parent", func(t *testing.T) {
+		var rctx request.CTX = request.TestContext(t)
+		rctx = RequestContextWithMaster(rctx)
+		rctxClone := rctx.Clone()
+
+		assert.True(t, HasMaster(rctx.Context()))
+		assert.True(t, HasMaster(rctxClone.Context()))
+	})
+
+	t.Run("changing the child does not alter the parent", func(t *testing.T) {
+		var rctx request.CTX = request.TestContext(t)
+		rctxClone := rctx.Clone()
+		rctxClone = RequestContextWithMaster(rctxClone)
+
+		assert.False(t, HasMaster(rctx.Context()))
+		assert.True(t, HasMaster(rctxClone.Context()))
+	})
+
+	t.Run("changing the parent does not alter the child", func(t *testing.T) {
+		var rctx request.CTX = request.TestContext(t)
+		rctxClone := rctx.Clone()
+		rctx = RequestContextWithMaster(rctx)
+
+		assert.True(t, HasMaster(rctx.Context()))
+		assert.False(t, HasMaster(rctxClone.Context()))
+	})
+}