diff --git a/.golangci.yml b/.golangci.yml
index d69946c..7056efe 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,5 +1,5 @@
 run:
-  go: 1.19
+  go: 1.24.3
   timeout: 10m
 linters:
   disable-all: true
diff --git a/Makefile b/Makefile
index c05f9ff..aa27084 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
-EXCLUDE_FOLDER = "basic\|intermediate\|utilities"
-TEST_PACKAGE := $(shell go list ./... | grep -v $(EXCLUDE_FOLDER))
+# EXCLUDE_FOLDER = "basic\|intermediate\|utilities"
+# TEST_PACKAGE := $(shell go list ./... | grep -v $(EXCLUDE_FOLDER))
+TEST_PACKAGE := $(shell go list ./tests/...)
 
 .DEFAULT_GOAL := test
 
diff --git a/math/prima/cek_prima.go b/math/prima/cek_prima.go
index da8dcfa..f8330e0 100644
--- a/math/prima/cek_prima.go
+++ b/math/prima/cek_prima.go
@@ -3,17 +3,19 @@ package prima
 // PembagianTrial memeriksa apakah sebuah bilangan dari n adalah
 // bilangan prima
 // Parameter:
-// 	n - bilangan bulat bertipe integer 64
+//
+//	n - bilangan bulat bertipe integer 64
 //
 // Return:
+//
 //	bool - true jika n adalah bilangan prima, false jika tidak prima
 func PembagianTrial(n int64) bool {
 	if n < 2 {
 		return false
 	}
-	
+
 	for i := int64(2); i < n; i++ {
-		if n % i == 0 {
+		if n%i == 0 {
 			return false
 		}
 	}
diff --git a/math_implementation/armstrong/is_armstrong.go b/math_implementation/armstrong/is_armstrong.go
index cebc338..d296b83 100644
--- a/math_implementation/armstrong/is_armstrong.go
+++ b/math_implementation/armstrong/is_armstrong.go
@@ -11,7 +11,7 @@ import (
 	"strconv"
 )
 
-func cekArmstrong(angka int) bool {
+func CekArmstrong(angka int) bool {
 	var digit_kanan int
 	var sum int = 0
 	var tempNum int = angka
diff --git a/searching/interpolation.go b/searching/interpolation.go
index 99c4e13..4fd0325 100644
--- a/searching/interpolation.go
+++ b/searching/interpolation.go
@@ -11,7 +11,7 @@ package searching
 // Return:
 // - indeks pertama dari nilai yang cocok
 // - error jika tidak ditemukan atau kondisi input tidak valid
-func pencarianInterpolasi(sortedData []int, tebakan int) (int, error) {
+func PencarianInterpolasi(sortedData []int, tebakan int) (int, error) {
 	// jika data kosong, langsung return error karena tidak ada data yang dicari
 	if len(sortedData) == 0 {
 		return -1, ErrorMessage
diff --git a/searching/linear_searching.go b/searching/linear_searching.go
index 4116683..eed2864 100644
--- a/searching/linear_searching.go
+++ b/searching/linear_searching.go
@@ -11,7 +11,7 @@ package searching
 // Return:
 // - int: indeks pertama tempat query ditemukan
 // - error: jika query tidak ditemukan, maka throw error
-func linearSearching(array []int, query int) (int, error) {
+func LinearSearching(array []int, query int) (int, error) {
 	// melakukan iterasi terhadap array menggunakan array
 	// dimana `i` adalah indeks dan `item` adalah nilai pada posisi tersebut
 	for i, item := range array {
diff --git a/searching/ternary_searching.go b/searching/ternary_searching.go
index 139f0a6..8dc6e45 100644
--- a/searching/ternary_searching.go
+++ b/searching/ternary_searching.go
@@ -23,7 +23,7 @@ import (
 // Return:
 // float64 - nilai maks dari f(x) dalam unterval [a, b]
 // error - error jika input tidak valid atau terjadi masalah selama eksekusi
-func ternaryMaxSearching(a, b, epsilon float64, f func(x float64) float64) (float64, error) {
+func TernaryMaxSearching(a, b, epsilon float64, f func(x float64) float64) (float64, error) {
 	if a == math.Inf(-1) || b == math.Inf(1) {
 		return -1, fmt.Errorf("interval harus memiliki angka float64")
 	}
@@ -34,10 +34,10 @@ func ternaryMaxSearching(a, b, epsilon float64, f func(x float64) float64) (floa
 	kiri := (2*a + b) / 3
 	kanan := (a + 2*b) / 3
 	if f(kiri) < f(kanan) {
-		return ternaryMaxSearching(kiri, b, epsilon, f)
+		return TernaryMaxSearching(kiri, b, epsilon, f)
 	}
 
-	return ternaryMaxSearching(a, kanan, epsilon, f)
+	return TernaryMaxSearching(a, kanan, epsilon, f)
 }
 
 // ternaryMinSearching mencari nilai minimum lokal dari fungsi(x) dalam interval [a, b]
@@ -47,7 +47,7 @@ func ternaryMaxSearching(a, b, epsilon float64, f func(x float64) float64) (floa
 // - evaluasi nilai f(x) pada dua titik tengah: kiri dan kanan
 // - jika f(kiri) > f(kanan), maka nilai minimum berbeda di sisi kanan
 // proses berlanjut secara rekursif hingga interval lebih kecil dari epsilon
-func ternaryMinSearching(a, b, epsilon float64, f func(x float64) float64) (float64, error) {
+func TernaryMinSearching(a, b, epsilon float64, f func(x float64) float64) (float64, error) {
 	if a == math.Inf(-1) || b == math.Inf(1) {
 		return -1, fmt.Errorf("interval harus memiliki angka float64")
 	}
@@ -59,7 +59,7 @@ func ternaryMinSearching(a, b, epsilon float64, f func(x float64) float64) (floa
 	kiri := (2*a + b) / 3
 	kanan := (a + 2*b) / 3
 	if f(kiri) > f(kanan) {
-		return ternaryMinSearching(kiri, b, epsilon, f)
+		return TernaryMinSearching(kiri, b, epsilon, f)
 	}
-	return ternaryMinSearching(a, kanan, epsilon, f)
+	return TernaryMinSearching(a, kanan, epsilon, f)
 }
diff --git a/searching/interpolation_test.go b/tests/algorithm/searching/interpolation_test.go
similarity index 68%
rename from searching/interpolation_test.go
rename to tests/algorithm/searching/interpolation_test.go
index 6e1e4ae..1f3b90a 100644
--- a/searching/interpolation_test.go
+++ b/tests/algorithm/searching/interpolation_test.go
@@ -1,10 +1,14 @@
 package searching
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/bellshade/Golang/searching"
+)
 
 func TestInterpolasi(t *testing.T) {
 	for _, test := range searchTests {
-		valueAktual, _ := pencarianInterpolasi(test.data, test.key)
+		valueAktual, _ := searching.PencarianInterpolasi(test.data, test.key)
 		if valueAktual != test.ekspetasi {
 			t.Errorf("test '%s' gagal: input array `%v` dengan key `%d`, ekspetasi `%d`, aktual: `%d`", test.name, test.data, test.key, test.ekspetasi, valueAktual)
 		}
diff --git a/searching/linear_searching_test.go b/tests/algorithm/searching/linear_searching_test.go
similarity index 69%
rename from searching/linear_searching_test.go
rename to tests/algorithm/searching/linear_searching_test.go
index 7232fb7..3b0cbd1 100644
--- a/searching/linear_searching_test.go
+++ b/tests/algorithm/searching/linear_searching_test.go
@@ -1,10 +1,14 @@
 package searching
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/bellshade/Golang/searching"
+)
 
 func TestLinearSearching(t *testing.T) {
 	for _, test := range searchTests {
-		valueAktual, _ := linearSearching(test.data, test.key)
+		valueAktual, _ := searching.LinearSearching(test.data, test.key)
 		if valueAktual != test.ekspetasi {
 			t.Errorf("test `%s` gagal: input array `%v` dengan key `%d`, ekspetasi: `%d`, aktual: `%d`", test.name, test.data, test.key, test.ekspetasi, valueAktual)
 		}
diff --git a/searching/ternary_searching_test.go b/tests/algorithm/searching/ternary_searching_test.go
similarity index 82%
rename from searching/ternary_searching_test.go
rename to tests/algorithm/searching/ternary_searching_test.go
index 2bd4c70..4e83c18 100644
--- a/searching/ternary_searching_test.go
+++ b/tests/algorithm/searching/ternary_searching_test.go
@@ -3,6 +3,8 @@ package searching
 import (
 	"math"
 	"testing"
+
+	"github.com/bellshade/Golang/searching"
 )
 
 const EPS = 1e-6
@@ -12,7 +14,7 @@ func equal(a, b float64) bool {
 }
 
 func TestTernaryMax(t *testing.T) {
-	var tests = []struct {
+	tests := []struct {
 		f         func(x float64) float64
 		a         float64
 		b         float64
@@ -22,7 +24,7 @@ func TestTernaryMax(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		hasil, error := ternaryMaxSearching(test.a, test.b, EPS, test.f)
+		hasil, error := searching.TernaryMaxSearching(test.a, test.b, EPS, test.f)
 		if error != nil {
 			t.Errorf("error, data: `%v`", error)
 		}
@@ -34,7 +36,7 @@ func TestTernaryMax(t *testing.T) {
 }
 
 func TestTernaryMin(t *testing.T) {
-	var tests = []struct {
+	tests := []struct {
 		f         func(x float64) float64
 		a         float64
 		b         float64
@@ -45,7 +47,7 @@ func TestTernaryMin(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		hasil, error := ternaryMinSearching(test.a, test.b, EPS, test.f)
+		hasil, error := searching.TernaryMinSearching(test.a, test.b, EPS, test.f)
 		if error != nil {
 			t.Errorf("error, data: `%v`", error)
 		}
diff --git a/tests/algorithm/searching/test_data_search.go b/tests/algorithm/searching/test_data_search.go
new file mode 100644
index 0000000..878f278
--- /dev/null
+++ b/tests/algorithm/searching/test_data_search.go
@@ -0,0 +1,26 @@
+package searching
+
+import "errors"
+
+var ErrorMessage = errors.New("target tidak terdapat pada array")
+
+type searchTest struct {
+	data           []int
+	key            int
+	ekspetasi      int
+	ekspetasiError error
+	name           string
+}
+
+var searchTests = []searchTest{
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 10, 9, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 9, 8, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 8, 7, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 7, 6, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 6, 5, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 5, 4, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 4, 3, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 3, 2, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 2, 1, nil, "Sanity"},
+	{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 1, 0, nil, "Sanity"},
+}
diff --git a/math/prima/cek_prima_test.go b/tests/math/cek_prima_test.go
similarity index 74%
rename from math/prima/cek_prima_test.go
rename to tests/math/cek_prima_test.go
index 0e386b4..4bd863e 100644
--- a/math/prima/cek_prima_test.go
+++ b/tests/math/cek_prima_test.go
@@ -1,7 +1,9 @@
-package prima
+package math_test
 
 import (
 	"testing"
+
+	"github.com/bellshade/Golang/math/prima"
 )
 
 func TestPembagianTrial(t *testing.T) {
@@ -17,7 +19,7 @@ func TestPembagianTrial(t *testing.T) {
 
 	for _, testingTest := range testingData {
 		t.Run(testingTest.name, func(t *testing.T) {
-			if getData := PembagianTrial(testingTest.n); getData != testingTest.ekspetasi {
+			if getData := prima.PembagianTrial(testingTest.n); getData != testingTest.ekspetasi {
 				t.Errorf("PembagianTrial(%v) = %v; ekspetasi %v", testingTest.n, getData, testingTest.ekspetasi)
 			}
 		})
diff --git a/math/cos_test.go b/tests/math/cos_test.go
similarity index 100%
rename from math/cos_test.go
rename to tests/math/cos_test.go
diff --git a/math_implementation/faktorial/faktorial_test.go b/tests/math/implementation/faktorial_test.go
similarity index 70%
rename from math_implementation/faktorial/faktorial_test.go
rename to tests/math/implementation/faktorial_test.go
index 974695c..0d3dd30 100644
--- a/math_implementation/faktorial/faktorial_test.go
+++ b/tests/math/implementation/faktorial_test.go
@@ -1,19 +1,21 @@
-package faktorial
+package math_implementation
 
 import (
 	"fmt"
 	"testing"
+
+	"github.com/bellshade/Golang/math_implementation/faktorial"
 )
 
 type fungsiFaktorial func(int) (int, error)
 
 var implementasi = map[string]fungsiFaktorial{
-	"Iterasi":  Iterasi,
-	"Rekursif": Rekursif,
-	"Tree":     TreeBin,
+	"Iterasi":  faktorial.Iterasi,
+	"Rekursif": faktorial.Rekursif,
+	"Tree":     faktorial.TreeBin,
 }
 
-var testCase = []struct {
+var testCaseFactorial = []struct {
 	n         int
 	ekspetasi int
 }{
@@ -27,12 +29,12 @@ func TestFaktorial(t *testing.T) {
 	for implName, implFunction := range implementasi {
 		t.Run(implName+" error input negatif", func(t *testing.T) {
 			_, error := implFunction(-1)
-			if error != ArgumentNegatif {
+			if error != faktorial.ArgumentNegatif {
 				t.Errorf("tidak ada error dari input negatif")
 			}
 		})
 
-		for _, tc := range testCase {
+		for _, tc := range testCaseFactorial {
 			t.Run(fmt.Sprintf("%s dengan input %d", implName, tc.n), func(t *testing.T) {
 				aktual, err := implFunction(tc.n)
 				if err != nil {
diff --git a/math_implementation/armstrong/is_armstrong_test.go b/tests/math/implementation/is_armstrong_test.go
similarity index 80%
rename from math_implementation/armstrong/is_armstrong_test.go
rename to tests/math/implementation/is_armstrong_test.go
index 5c9fc55..ee85b9d 100644
--- a/math_implementation/armstrong/is_armstrong_test.go
+++ b/tests/math/implementation/is_armstrong_test.go
@@ -1,6 +1,10 @@
-package armstrong
+package math_implementation
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/bellshade/Golang/math_implementation/armstrong"
+)
 
 var testCase = []struct {
 	name     string
@@ -37,7 +41,7 @@ var testCase = []struct {
 func TestArmstrong(t *testing.T) {
 	for _, test := range testCase {
 		t.Run(test.name, func(t *testing.T) {
-			funcResult := cekArmstrong(test.input)
+			funcResult := armstrong.CekArmstrong(test.input)
 			if test.expected != funcResult {
 				t.Errorf("expect jawaban '%t' untuk nomor '%d' tapi jawaban yang diberikan %t", test.expected, test.input, funcResult)
 			}
diff --git a/math_implementation/logaritma/logaritma_test.go b/tests/math/implementation/logaritma_test.go
similarity index 68%
rename from math_implementation/logaritma/logaritma_test.go
rename to tests/math/implementation/logaritma_test.go
index ee689dc..50fa44c 100644
--- a/math_implementation/logaritma/logaritma_test.go
+++ b/tests/math/implementation/logaritma_test.go
@@ -1,7 +1,9 @@
-package logaritma
+package math_implementation
 
 import (
 	"testing"
+
+	"github.com/bellshade/Golang/math_implementation/logaritma"
 )
 
 func TestLogBase32(t *testing.T) {
@@ -15,7 +17,7 @@ func TestLogBase32(t *testing.T) {
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			if dapat := LogBase2(test.n); dapat != test.want {
+			if dapat := logaritma.LogBase2(test.n); dapat != test.want {
 				t.Errorf("logBase2() = %v, harusnya %v", dapat, test.want)
 			}
 		})
diff --git a/math/sin_test.go b/tests/math/sin_test.go
similarity index 93%
rename from math/sin_test.go
rename to tests/math/sin_test.go
index cfcb80e..59b0814 100644
--- a/math/sin_test.go
+++ b/tests/math/sin_test.go
@@ -31,13 +31,13 @@ func TestSin(t *testing.T) {
 }
 
 func BenchmarkSin(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		algmath.Sin(180)
 	}
 }
 
 func BenchmarkMathSin(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		stdmath.Sin(180)
 	}
 }
diff --git a/tests/test_utils.go b/tests/test_utils.go
new file mode 100644
index 0000000..d869ce8
--- /dev/null
+++ b/tests/test_utils.go
@@ -0,0 +1,33 @@
+package tests
+
+import (
+	"reflect"
+	"testing"
+)
+
+// assert fails the test if the condition is false.
+// assert: Gagal jika kondisi yang diberikan bernilai false (tidak terpenuhi).
+func Assert(tb testing.TB, condition bool, msg string, v ...any) {
+	tb.Helper()
+	if !condition {
+		tb.Fatalf(msg, v...)
+	}
+}
+
+// ok fails the test if an err is not nil.
+// ok: Gagal jika error tidak bernilai nil (artinya terjadi kesalahan).
+func OK(tb testing.TB, err error) {
+	tb.Helper() // print runtime caller err
+	if err != nil {
+		tb.Fatalf("unexpected error: %s", err.Error())
+	}
+}
+
+// equals fails the test if exp is not equal to act.
+// equals: Gagal jika nilai yang diharapkan (exp) tidak sama dengan nilai aktual (act).
+func Equals(tb testing.TB, exp, act any) {
+	tb.Helper()
+	if !reflect.DeepEqual(exp, act) {
+		tb.Fatalf("exp: %#v\n\n\tgot: %#v", exp, act)
+	}
+}