diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 15e10bd..0f9b707 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+env:
+  GO_VERSION: 1.19.2
+
 jobs:
   run:
     runs-on: ubuntu-latest
@@ -17,7 +20,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: 1.19.2
+          go-version: ${{ env.GO_VERSION }}
 
       - name: Go Format
         run: gofmt -s -w . && git diff --exit-code
@@ -38,3 +41,31 @@ jobs:
         run: go install golang.org/x/vuln/cmd/govulncheck@latest
       - name: Run govulncheck
         run: govulncheck ./...
+
+  tests-on-windows:
+    needs: run
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Go Test
+        run: go test -v -race ./...
+
+  tests-on-macos:
+    needs: run 
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Go Test
+        run: go test -v -race ./...
diff --git a/pkg/analyzer/analyzer_test.go b/pkg/analyzer/analyzer_test.go
index 06ea6ce..2b26850 100644
--- a/pkg/analyzer/analyzer_test.go
+++ b/pkg/analyzer/analyzer_test.go
@@ -8,37 +8,35 @@ import (
 	"github.com/sashamelentyev/usestdlibvars/pkg/analyzer"
 )
 
+var flags = []string{
+	analyzer.TimeWeekdayFlag,
+	analyzer.TimeMonthFlag,
+	analyzer.TimeLayoutFlag,
+	analyzer.CryptoHashFlag,
+	analyzer.RPCDefaultPathFlag,
+	analyzer.SQLIsolationLevelFlag,
+	analyzer.TLSSignatureSchemeFlag,
+	analyzer.ConstantKindFlag,
+}
+
+var pkgs = []string{
+	"a/crypto",
+	"a/http",
+	"a/rpc",
+	"a/time",
+	"a/sql",
+	"a/tls",
+	"a/constant",
+}
+
 func TestUseStdlibVars(t *testing.T) {
 	a := analyzer.New()
 
-	for _, flag := range []string{
-		analyzer.TimeWeekdayFlag,
-		analyzer.TimeMonthFlag,
-		analyzer.TimeLayoutFlag,
-		analyzer.CryptoHashFlag,
-		analyzer.RPCDefaultPathFlag,
-		analyzer.OSDevNullFlag,
-		analyzer.SQLIsolationLevelFlag,
-		analyzer.TLSSignatureSchemeFlag,
-		analyzer.ConstantKindFlag,
-		analyzer.SyslogPriorityFlag,
-	} {
+	for _, flag := range flags {
 		if err := a.Flags.Set(flag, "true"); err != nil {
 			t.Fatal(err)
 		}
 	}
 
-	pkgs := []string{
-		"a/crypto",
-		"a/http",
-		"a/rpc",
-		"a/time",
-		"a/os",
-		"a/sql",
-		"a/tls",
-		"a/constant",
-		"a/syslog",
-	}
-
 	analysistest.Run(t, analysistest.TestData(), a, pkgs...)
 }
diff --git a/pkg/analyzer/internal/mapping/mapping.go b/pkg/analyzer/internal/mapping/mapping.go
index a33a10c..2bd5894 100644
--- a/pkg/analyzer/internal/mapping/mapping.go
+++ b/pkg/analyzer/internal/mapping/mapping.go
@@ -5,10 +5,8 @@ import (
 	"crypto/tls"
 	"database/sql"
 	"go/constant"
-	"log/syslog"
 	"net/http"
 	"net/rpc"
-	"os"
 	"strconv"
 	"time"
 )
@@ -165,9 +163,7 @@ var TimeLayout = map[string]string{
 	time.StampNano:   "time.StampNano",
 }
 
-var OSDevNull = map[string]string{
-	os.DevNull: "os.DevNull",
-}
+var OSDevNull = map[string]string{}
 
 var SQLIsolationLevel = map[string]string{
 	// sql.LevelDefault.String():         "sql.LevelDefault.String()",
@@ -204,34 +200,4 @@ var ConstantKind = map[string]string{
 	constant.Complex.String(): "constant.Complex.String()",
 }
 
-var SyslogPriority = map[string]string{
-	// strconv.Itoa(int(syslog.LOG_EMERG)):    "syslog.LOG_EMERG",
-	strconv.Itoa(int(syslog.LOG_ALERT)):   "syslog.LOG_ALERT",
-	strconv.Itoa(int(syslog.LOG_CRIT)):    "syslog.LOG_CRIT",
-	strconv.Itoa(int(syslog.LOG_ERR)):     "syslog.LOG_ERR",
-	strconv.Itoa(int(syslog.LOG_WARNING)): "syslog.LOG_WARNING",
-	strconv.Itoa(int(syslog.LOG_NOTICE)):  "syslog.LOG_NOTICE",
-	strconv.Itoa(int(syslog.LOG_INFO)):    "syslog.LOG_INFO",
-	strconv.Itoa(int(syslog.LOG_DEBUG)):   "syslog.LOG_DEBUG",
-
-	// strconv.Itoa(int(syslog.LOG_KERN)):     "syslog.LOG_KERN",
-	strconv.Itoa(int(syslog.LOG_USER)):     "syslog.LOG_USER",
-	strconv.Itoa(int(syslog.LOG_MAIL)):     "syslog.LOG_MAIL",
-	strconv.Itoa(int(syslog.LOG_DAEMON)):   "syslog.LOG_DAEMON",
-	strconv.Itoa(int(syslog.LOG_AUTH)):     "syslog.LOG_AUTH",
-	strconv.Itoa(int(syslog.LOG_SYSLOG)):   "syslog.LOG_SYSLOG",
-	strconv.Itoa(int(syslog.LOG_LPR)):      "syslog.LOG_LPR",
-	strconv.Itoa(int(syslog.LOG_NEWS)):     "syslog.LOG_NEWS",
-	strconv.Itoa(int(syslog.LOG_UUCP)):     "syslog.LOG_UUCP",
-	strconv.Itoa(int(syslog.LOG_CRON)):     "syslog.LOG_CRON",
-	strconv.Itoa(int(syslog.LOG_AUTHPRIV)): "syslog.LOG_AUTHPRIV",
-	strconv.Itoa(int(syslog.LOG_FTP)):      "syslog.LOG_FTP",
-	strconv.Itoa(int(syslog.LOG_LOCAL0)):   "syslog.LOG_LOCAL0",
-	strconv.Itoa(int(syslog.LOG_LOCAL1)):   "syslog.LOG_LOCAL1",
-	strconv.Itoa(int(syslog.LOG_LOCAL2)):   "syslog.LOG_LOCAL2",
-	strconv.Itoa(int(syslog.LOG_LOCAL3)):   "syslog.LOG_LOCAL3",
-	strconv.Itoa(int(syslog.LOG_LOCAL4)):   "syslog.LOG_LOCAL4",
-	strconv.Itoa(int(syslog.LOG_LOCAL5)):   "syslog.LOG_LOCAL5",
-	strconv.Itoa(int(syslog.LOG_LOCAL6)):   "syslog.LOG_LOCAL6",
-	strconv.Itoa(int(syslog.LOG_LOCAL7)):   "syslog.LOG_LOCAL7",
-}
+var SyslogPriority = map[string]string{}
diff --git a/pkg/analyzer/internal/mapping/osdevnull.go b/pkg/analyzer/internal/mapping/osdevnull.go
new file mode 100644
index 0000000..c75c129
--- /dev/null
+++ b/pkg/analyzer/internal/mapping/osdevnull.go
@@ -0,0 +1,9 @@
+//go:build unix || (js && wasm)
+
+package mapping
+
+import "os"
+
+func init() {
+	OSDevNull[os.DevNull] = "os.DevNull"
+}
diff --git a/pkg/analyzer/internal/mapping/syslogpriority.go b/pkg/analyzer/internal/mapping/syslogpriority.go
new file mode 100644
index 0000000..4e6dc5d
--- /dev/null
+++ b/pkg/analyzer/internal/mapping/syslogpriority.go
@@ -0,0 +1,40 @@
+//go:build !windows && !plan9
+
+package mapping
+
+import (
+	"log/syslog"
+	"strconv"
+)
+
+func init() {
+	// SyslogPriority[strconv.Itoa(int(syslog.LOG_EMERG))] = "syslog.LOG_EMERG"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_ALERT))] = "syslog.LOG_ALERT"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_CRIT))] = "syslog.LOG_CRIT"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_ERR))] = "syslog.LOG_ERR"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_WARNING))] = "syslog.LOG_WARNING"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_NOTICE))] = "syslog.LOG_NOTICE"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_INFO))] = "syslog.LOG_INFO"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_DEBUG))] = "syslog.LOG_DEBUG"
+
+	// SyslogPriority[strconv.Itoa(int(syslog.LOG_KERN))] = "syslog.LOG_KERN"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_USER))] = "syslog.LOG_USER"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_MAIL))] = "syslog.LOG_MAIL"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_DAEMON))] = "syslog.LOG_DAEMON"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_AUTH))] = "syslog.LOG_AUTH"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_SYSLOG))] = "syslog.LOG_SYSLOG"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LPR))] = "syslog.LOG_LPR"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_NEWS))] = "syslog.LOG_NEWS"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_UUCP))] = "syslog.LOG_UUCP"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_CRON))] = "syslog.LOG_CRON"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_AUTHPRIV))] = "syslog.LOG_AUTHPRIV"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_FTP))] = "syslog.LOG_FTP"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL0))] = "syslog.LOG_LOCAL0"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL1))] = "syslog.LOG_LOCAL1"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL2))] = "syslog.LOG_LOCAL2"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL3))] = "syslog.LOG_LOCAL3"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL4))] = "syslog.LOG_LOCAL4"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL5))] = "syslog.LOG_LOCAL5"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL6))] = "syslog.LOG_LOCAL6"
+	SyslogPriority[strconv.Itoa(int(syslog.LOG_LOCAL7))] = "syslog.LOG_LOCAL7"
+}
diff --git a/pkg/analyzer/os_dev_test.go b/pkg/analyzer/os_dev_test.go
new file mode 100644
index 0000000..bbef44d
--- /dev/null
+++ b/pkg/analyzer/os_dev_test.go
@@ -0,0 +1,10 @@
+//go:build unix || (js && wasm)
+
+package analyzer_test
+
+import "github.com/sashamelentyev/usestdlibvars/pkg/analyzer"
+
+func init() {
+	flags = append(flags, analyzer.OSDevNullFlag)
+	pkgs = append(pkgs, "a/os")
+}
diff --git a/pkg/analyzer/syslog_priority_test.go b/pkg/analyzer/syslog_priority_test.go
new file mode 100644
index 0000000..f4d1547
--- /dev/null
+++ b/pkg/analyzer/syslog_priority_test.go
@@ -0,0 +1,10 @@
+//go:build !windows && !plan9
+
+package analyzer_test
+
+import "github.com/sashamelentyev/usestdlibvars/pkg/analyzer"
+
+func init() {
+	flags = append(flags, analyzer.SyslogPriorityFlag)
+	pkgs = append(pkgs, "a/syslog")
+}