diff --git a/internal/common/common.go b/internal/common/common.go
index ebf70ea..f1e4154 100644
--- a/internal/common/common.go
+++ b/internal/common/common.go
@@ -352,6 +352,16 @@ func HostDev(combineWith ...string) string {
 	return GetEnv("HOST_DEV", "/dev", combineWith...)
 }
 
+// MockEnv set environment variable and return revert function.
+// MockEnv should be used testing only.
+func MockEnv(key string, value string) func() {
+	original := os.Getenv(key)
+	os.Setenv(key, value)
+	return func() {
+		os.Setenv(key, original)
+	}
+}
+
 // getSysctrlEnv sets LC_ALL=C in a list of env vars for use when running
 // sysctl commands (see DoSysctrl).
 func getSysctrlEnv(env []string) []string {
diff --git a/process/process_linux_test.go b/process/process_linux_test.go
new file mode 100644
index 0000000..bfbe96d
--- /dev/null
+++ b/process/process_linux_test.go
@@ -0,0 +1,29 @@
+// +build linux
+
+package process
+
+import (
+	"context"
+	"io/ioutil"
+	"strconv"
+	"testing"
+
+	"github.com/shirou/gopsutil/internal/common"
+)
+
+func Test_fillFromStatusWithContext(t *testing.T) {
+	pids, err := ioutil.ReadDir("testdata/linux/")
+	if err != nil {
+		t.Error(err)
+	}
+	f := common.MockEnv("HOST_PROC", "testdata/linux")
+	defer f()
+	for _, pid := range pids {
+		pid, _ := strconv.ParseInt(pid.Name(), 0, 32)
+		p, _ := NewProcess(int32(pid))
+
+		if err := p.fillFromStatusWithContext(context.Background()); err != nil {
+			t.Error(err)
+		}
+	}
+}
diff --git a/process/testdata/linux/1/status b/process/testdata/linux/1/status
new file mode 100644
index 0000000..fda629d
--- /dev/null
+++ b/process/testdata/linux/1/status
@@ -0,0 +1,37 @@
+Name:	ksoftirqd/0
+Umask:	0000
+State:	S (sleeping)
+Tgid:	10
+Ngid:	0
+Pid:	10
+PPid:	2
+TracerPid:	0
+Uid:	0	0	0	0
+Gid:	0	0	0	0
+FDSize:	64
+Groups:	 
+NStgid:	10
+NSpid:	10
+NSpgid:	0
+NSsid:	0
+Threads:	1
+SigQ:	0/27700
+SigPnd:	0000000000000000
+ShdPnd:	0000000000000000
+SigBlk:	0000000000000000
+SigIgn:	ffffffffffffffff
+SigCgt:	0000000000000000
+CapInh:	0000000000000000
+CapPrm:	0000003fffffffff
+CapEff:	0000003fffffffff
+CapBnd:	0000003fffffffff
+CapAmb:	0000000000000000
+NoNewPrivs:	0
+Seccomp:	0
+Speculation_Store_Bypass:	vulnerable
+Cpus_allowed:	1
+Cpus_allowed_list:	0
+Mems_allowed:	00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
+Mems_allowed_list:	0
+voluntary_ctxt_switches:	76887
+nonvoluntary_ctxt_switches:	1771
diff --git a/process/testdata/linux/1060/status b/process/testdata/linux/1060/status
new file mode 100644
index 0000000..beaa534
--- /dev/null
+++ b/process/testdata/linux/1060/status
@@ -0,0 +1,47 @@
+Name:	server
+Umask:	0022
+State:	S (sleeping)
+Tgid:	2549
+Ngid:	0
+Pid:	2549
+PPid:	1
+TracerPid:	0
+Uid:	107	107	107	107
+Gid:	113	113	113	113
+FDSize:	64
+Groups:	113 
+VmPeak:	  664744 kB
+VmSize:	  664744 kB
+VmLck:	       0 kB
+VmPin:	       0 kB
+VmHWM:	    2892 kB
+VmRSS:	    2892 kB
+RssAnon:	     524 kB
+RssFile:	    2368 kB
+RssShmem:	       0 kB
+VmData:	    5932 kB
+VmStk:	     132 kB
+VmExe:	    1304 kB
+VmLib:	    1180 kB
+VmPTE:	      44 kB
+VmSwap:	       0 kB
+CoreDumping:	0
+THP_enabled:	1
+Threads:	5
+SigQ:	0/1823
+SigPnd:	00000000000000000000000000000000
+ShdPnd:	00000000000000000000000000000000
+SigBlk:	00000000000000000000000000000000
+SigIgn:	00000000000000000000000000000000
+SigCgt:	fffffffffffffffffffffffe783ffeff
+CapInh:	0000000000000000
+CapPrm:	0000000000000000
+CapEff:	0000000000000000
+CapBnd:	0000003fffffffff
+CapAmb:	0000000000000000
+NoNewPrivs:	0
+Speculation_Store_Bypass:	unknown
+Cpus_allowed:	3
+Cpus_allowed_list:	0-1
+voluntary_ctxt_switches:	3
+nonvoluntary_ctxt_switches:	146
\ No newline at end of file
diff --git a/v3/internal/common/common.go b/v3/internal/common/common.go
index ebf70ea..f1e4154 100644
--- a/v3/internal/common/common.go
+++ b/v3/internal/common/common.go
@@ -352,6 +352,16 @@ func HostDev(combineWith ...string) string {
 	return GetEnv("HOST_DEV", "/dev", combineWith...)
 }
 
+// MockEnv set environment variable and return revert function.
+// MockEnv should be used testing only.
+func MockEnv(key string, value string) func() {
+	original := os.Getenv(key)
+	os.Setenv(key, value)
+	return func() {
+		os.Setenv(key, original)
+	}
+}
+
 // getSysctrlEnv sets LC_ALL=C in a list of env vars for use when running
 // sysctl commands (see DoSysctrl).
 func getSysctrlEnv(env []string) []string {
diff --git a/v3/process/process_linux_test.go b/v3/process/process_linux_test.go
new file mode 100644
index 0000000..ada0ab8
--- /dev/null
+++ b/v3/process/process_linux_test.go
@@ -0,0 +1,29 @@
+// +build linux
+
+package process
+
+import (
+	"context"
+	"io/ioutil"
+	"strconv"
+	"testing"
+
+	"github.com/shirou/gopsutil/v3/internal/common"
+)
+
+func Test_fillFromStatusWithContext(t *testing.T) {
+	pids, err := ioutil.ReadDir("testdata/linux/")
+	if err != nil {
+		t.Error(err)
+	}
+	f := common.MockEnv("HOST_PROC", "testdata/linux")
+	defer f()
+	for _, pid := range pids {
+		pid, _ := strconv.ParseInt(pid.Name(), 0, 32)
+		p, _ := NewProcess(int32(pid))
+
+		if err := p.fillFromStatusWithContext(context.Background()); err != nil {
+			t.Error(err)
+		}
+	}
+}
diff --git a/v3/process/testdata/linux/1/status b/v3/process/testdata/linux/1/status
new file mode 100644
index 0000000..fda629d
--- /dev/null
+++ b/v3/process/testdata/linux/1/status
@@ -0,0 +1,37 @@
+Name:	ksoftirqd/0
+Umask:	0000
+State:	S (sleeping)
+Tgid:	10
+Ngid:	0
+Pid:	10
+PPid:	2
+TracerPid:	0
+Uid:	0	0	0	0
+Gid:	0	0	0	0
+FDSize:	64
+Groups:	 
+NStgid:	10
+NSpid:	10
+NSpgid:	0
+NSsid:	0
+Threads:	1
+SigQ:	0/27700
+SigPnd:	0000000000000000
+ShdPnd:	0000000000000000
+SigBlk:	0000000000000000
+SigIgn:	ffffffffffffffff
+SigCgt:	0000000000000000
+CapInh:	0000000000000000
+CapPrm:	0000003fffffffff
+CapEff:	0000003fffffffff
+CapBnd:	0000003fffffffff
+CapAmb:	0000000000000000
+NoNewPrivs:	0
+Seccomp:	0
+Speculation_Store_Bypass:	vulnerable
+Cpus_allowed:	1
+Cpus_allowed_list:	0
+Mems_allowed:	00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
+Mems_allowed_list:	0
+voluntary_ctxt_switches:	76887
+nonvoluntary_ctxt_switches:	1771
diff --git a/v3/process/testdata/linux/1060/status b/v3/process/testdata/linux/1060/status
new file mode 100644
index 0000000..beaa534
--- /dev/null
+++ b/v3/process/testdata/linux/1060/status
@@ -0,0 +1,47 @@
+Name:	server
+Umask:	0022
+State:	S (sleeping)
+Tgid:	2549
+Ngid:	0
+Pid:	2549
+PPid:	1
+TracerPid:	0
+Uid:	107	107	107	107
+Gid:	113	113	113	113
+FDSize:	64
+Groups:	113 
+VmPeak:	  664744 kB
+VmSize:	  664744 kB
+VmLck:	       0 kB
+VmPin:	       0 kB
+VmHWM:	    2892 kB
+VmRSS:	    2892 kB
+RssAnon:	     524 kB
+RssFile:	    2368 kB
+RssShmem:	       0 kB
+VmData:	    5932 kB
+VmStk:	     132 kB
+VmExe:	    1304 kB
+VmLib:	    1180 kB
+VmPTE:	      44 kB
+VmSwap:	       0 kB
+CoreDumping:	0
+THP_enabled:	1
+Threads:	5
+SigQ:	0/1823
+SigPnd:	00000000000000000000000000000000
+ShdPnd:	00000000000000000000000000000000
+SigBlk:	00000000000000000000000000000000
+SigIgn:	00000000000000000000000000000000
+SigCgt:	fffffffffffffffffffffffe783ffeff
+CapInh:	0000000000000000
+CapPrm:	0000000000000000
+CapEff:	0000000000000000
+CapBnd:	0000003fffffffff
+CapAmb:	0000000000000000
+NoNewPrivs:	0
+Speculation_Store_Bypass:	unknown
+Cpus_allowed:	3
+Cpus_allowed_list:	0-1
+voluntary_ctxt_switches:	3
+nonvoluntary_ctxt_switches:	146
\ No newline at end of file