diff --git a/pkg/gee/print_test.go b/pkg/gee/print_test.go
new file mode 100644
index 0000000..2e8ae33
--- /dev/null
+++ b/pkg/gee/print_test.go
@@ -0,0 +1,42 @@
+package gee
+
+import (
+	"testing"
+
+	model "github.com/hahwul/gee/pkg/model"
+)
+
+func TestStdPrint(t *testing.T) {
+	type args struct {
+		line    string
+		options model.Options
+	}
+	tests := []struct {
+		name string
+		args args
+	}{
+		{
+			name: "test",
+			args: args{
+				line: "",
+				options: model.Options{
+					RemoveNewLine: true,
+				},
+			},
+		},
+		{
+			name: "test",
+			args: args{
+				line: "",
+				options: model.Options{
+					RemoveNewLine: false,
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			StdPrint(tt.args.line, tt.args.options)
+		})
+	}
+}
diff --git a/pkg/gee/regex_test.go b/pkg/gee/regex_test.go
new file mode 100644
index 0000000..7ec56ac
--- /dev/null
+++ b/pkg/gee/regex_test.go
@@ -0,0 +1,75 @@
+package gee
+
+import "testing"
+
+func TestRegex(t *testing.T) {
+	type args struct {
+		pattern string
+		str     string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "test - true",
+			args: args{
+				pattern: "abcd",
+				str:     "123abcd444",
+			},
+			want: true,
+		},
+		{
+			name: "test - false",
+			args: args{
+				pattern: "abcd",
+				str:     "123d444",
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Regex(tt.args.pattern, tt.args.str); got != tt.want {
+				t.Errorf("Regex() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestRegexV(t *testing.T) {
+	type args struct {
+		pattern string
+		str     string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "test - true",
+			args: args{
+				pattern: "abcd",
+				str:     "123d444",
+			},
+			want: true,
+		},
+		{
+			name: "test - false",
+			args: args{
+				pattern: "abcd",
+				str:     "123abcd444",
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := RegexV(tt.args.pattern, tt.args.str); got != tt.want {
+				t.Errorf("RegexV() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/pkg/gee/string_test.go b/pkg/gee/string_test.go
new file mode 100644
index 0000000..b7c08c7
--- /dev/null
+++ b/pkg/gee/string_test.go
@@ -0,0 +1,124 @@
+package gee
+
+import (
+	"testing"
+
+	"github.com/hahwul/gee/pkg/model"
+)
+
+func TestStringProc(t *testing.T) {
+	type args struct {
+		l       string
+		stdLine int
+		options model.Options
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "test",
+			args: args{
+				l:       "a1234",
+				stdLine: 0,
+				options: model.Options{
+					Find:     "a",
+					Replace:  "b",
+					Format:   "",
+					WithLine: true,
+				},
+			},
+			want: "[0] b1234",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, _ = StringProc(tt.args.l, tt.args.stdLine, tt.args.options)
+		})
+	}
+}
+
+func Test_toFormat(t *testing.T) {
+	type args struct {
+		str     string
+		options model.Options
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		// TODO: Add test cases.
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := toFormat(tt.args.str, tt.args.options); got != tt.want {
+				t.Errorf("toFormat() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_setFix(t *testing.T) {
+	type args struct {
+		str     string
+		options model.Options
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		// TODO: Add test cases.
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := setFix(tt.args.str, tt.args.options); got != tt.want {
+				t.Errorf("setFix() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_setPrefix(t *testing.T) {
+	type args struct {
+		str     string
+		options model.Options
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		// TODO: Add test cases.
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := setPrefix(tt.args.str, tt.args.options); got != tt.want {
+				t.Errorf("setPrefix() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_setSuffix(t *testing.T) {
+	type args struct {
+		str     string
+		options model.Options
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		// TODO: Add test cases.
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := setSuffix(tt.args.str, tt.args.options); got != tt.want {
+				t.Errorf("setSuffix() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/pkg/gee/time_test.go b/pkg/gee/time_test.go
new file mode 100644
index 0000000..f3dfbc0
--- /dev/null
+++ b/pkg/gee/time_test.go
@@ -0,0 +1,22 @@
+package gee
+
+import "testing"
+
+func TestGetNowTime(t *testing.T) {
+	tests := []struct {
+		name    string
+		notwant int
+	}{
+		{
+			name:    "test",
+			notwant: 0,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := GetNowTime(); len(got) == tt.notwant {
+				t.Errorf("GetNowTime() = %v, want %v", len(got), tt.notwant)
+			}
+		})
+	}
+}