diff --git a/prime_factors_230801/main_test.go b/prime_factors_230801/main_test.go
new file mode 100644
index 0000000..ed25ab1
--- /dev/null
+++ b/prime_factors_230801/main_test.go
@@ -0,0 +1,48 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func PrimeFactorsOf(n int) []int {
+	ret := make([]int, 0)
+	d := 2
+	for d < n {
+		for n%d == 0 {
+			ret = append(ret, d)
+			n /= d
+		}
+		d++
+	}
+	if n > 1 {
+		ret = append(ret, n)
+	}
+	return ret
+}
+
+func TestPrimeFactorsOf(t *testing.T) {
+	tt := []struct {
+		name  string
+		input int
+		want  []int
+	}{
+		{"1", 1, []int{}},
+		{"2", 2, []int{2}},
+		{"3", 3, []int{3}},
+		{"4", 4, []int{2, 2}},
+		{"6", 6, []int{2, 3}},
+		{"8", 8, []int{2, 2, 2}},
+		{"9", 9, []int{3, 3}},
+		{"a large number", 2 * 2 * 3 * 5 * 7 * 11 * 13 * 71, []int{2, 2, 3, 5, 7, 11, 13, 71}},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got := PrimeFactorsOf(tc.input)
+			if !reflect.DeepEqual(got, tc.want) {
+				t.Errorf("PrimeFactors(%d) = %v, want %v", tc.input, got, tc.want)
+			}
+		})
+	}
+}
diff --git a/prime_factors_230802/main_test.go b/prime_factors_230802/main_test.go
new file mode 100644
index 0000000..d42ea59
--- /dev/null
+++ b/prime_factors_230802/main_test.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func FactorsOfNumber(n int) []int {
+	ret := make([]int, 0)
+	d := 2
+	for d < n {
+		for n%d == 0 {
+			ret = append(ret, d)
+			n /= d
+		}
+		d++
+	}
+	if n > 1 {
+		ret = append(ret, n)
+	}
+	return ret
+}
+
+func TestFactorsOfNumber(t *testing.T) {
+	tt := []struct {
+		name  string
+		input int
+		want  []int
+	}{
+		{"1", 1, []int{}},
+		{"2", 2, []int{2}},
+		{"3", 3, []int{3}},
+		{"4", 4, []int{2, 2}},
+		{"6", 6, []int{2, 3}},
+		{"8", 8, []int{2, 2, 2}},
+		{"9", 9, []int{3, 3}},
+		{"a very large number", 2 * 3 * 5 * 7 * 11 * 13 * 31 * 71, []int{2, 3, 5, 7, 11, 13, 31, 71}},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got := FactorsOfNumber(tc.input)
+			if !reflect.DeepEqual(got, tc.want) {
+				t.Errorf("FactorsOfNumber(%d) = %v, want %v", tc.input, got, tc.want)
+			}
+		})
+	}
+}
diff --git a/prime_factors_230803/main_test.go b/prime_factors_230803/main_test.go
new file mode 100644
index 0000000..513d1ed
--- /dev/null
+++ b/prime_factors_230803/main_test.go
@@ -0,0 +1,48 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func PrimeFactorsOf(n int) []int {
+	ret := make([]int, 0)
+	d := 2
+	for d < n {
+		for n%d == 0 {
+			ret = append(ret, d)
+			n /= d
+		}
+		d++
+	}
+	if n > 1 {
+		ret = append(ret, n)
+	}
+	return ret
+}
+
+func TestPrimeFactorsOf(t *testing.T) {
+	tt := []struct {
+		name  string
+		input int
+		want  []int
+	}{
+		{"1", 1, []int{}},
+		{"2", 2, []int{2}},
+		{"3", 3, []int{3}},
+		{"4", 4, []int{2, 2}},
+		{"6", 6, []int{2, 3}},
+		{"8", 8, []int{2, 2, 2}},
+		{"9", 9, []int{3, 3}},
+		{"a very large number", 2 * 3 * 5 * 7 * 11 * 13 * 31 * 71, []int{2, 3, 5, 7, 11, 13, 31, 71}},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got := PrimeFactorsOf(tc.input)
+			if !reflect.DeepEqual(got, tc.want) {
+				t.Errorf("PrimeFactorsOf(%d) = %v, want %v", tc.input, got, tc.want)
+			}
+		})
+	}
+}
diff --git a/prime_factors_230804/main_test.go b/prime_factors_230804/main_test.go
new file mode 100644
index 0000000..77e26da
--- /dev/null
+++ b/prime_factors_230804/main_test.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func PrimeFactorsOf(n int) []int {
+	ret := make([]int, 0)
+	d := 2
+	for d < n {
+		for n%d == 0 {
+			ret = append(ret, d)
+			n /= d
+		}
+		d++
+	}
+	if n > 1 {
+		ret = append(ret, n)
+	}
+	return ret
+}
+
+func TestPrimeFactorsOf(t *testing.T) {
+	tt := []struct {
+		name  string
+		input int
+		want  []int
+	}{
+		{"1", 1, []int{}},
+		{"2", 2, []int{2}},
+		{"4", 4, []int{2, 2}},
+		{"6", 6, []int{2, 3}},
+		{"8", 8, []int{2, 2, 2}},
+		{"9", 9, []int{3, 3}},
+		{"a very large number", 2 * 3 * 5 * 11 * 13 * 17 * 71, []int{2, 3, 5, 11, 13, 17, 71}},
+	}
+
+	for _, tc := range tt {
+		got := PrimeFactorsOf(tc.input)
+		if !reflect.DeepEqual(got, tc.want) {
+			t.Errorf("PrimeFactors(%d) = %v, want %v", tc.input, got, tc.want)
+		}
+	}
+}
diff --git a/reverseString/main_test.go b/reverseString/main_test.go
new file mode 100644
index 0000000..bef10b6
--- /dev/null
+++ b/reverseString/main_test.go
@@ -0,0 +1,32 @@
+package main
+
+import "testing"
+
+func ReverseString(s string) string {
+	tm := []byte(s)
+	l := len(s)
+	for i := 0; i < l/2; i++ {
+		tm[i], tm[l-1-i] = tm[l-1-i], tm[i]
+	}
+	return string(tm)
+}
+
+func TestReverseString(t *testing.T) {
+	tt := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{"1", "test", "tset"},
+		{"2", "testing", "gnitset"},
+		{"3", "this is a testing string", "gnirts gnitset a si siht"},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got := ReverseString(tc.input)
+			if got != tc.want {
+				t.Errorf("ReverseString(%s) = %s, want %s", tc.input, got, tc.want)
+			}
+		})
+	}
+}
diff --git a/reverse_string+230804/main_test.go b/reverse_string+230804/main_test.go
new file mode 100644
index 0000000..4d1e28d
--- /dev/null
+++ b/reverse_string+230804/main_test.go
@@ -0,0 +1,30 @@
+package main
+
+import "testing"
+
+func ReverseString(s string) string {
+	tmp := []byte(s)
+	l := len(tmp)
+	for i := 0; i < l/2; i++ {
+		tmp[i], tmp[l-i-1] = tmp[l-i-1], tmp[i]
+	}
+	return string(tmp)
+}
+
+func TestReverseString(t *testing.T) {
+	tt := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{"test", "test", "tset"},
+		{"testing", "testing", "gnitset"},
+	}
+
+	for _, tc := range tt {
+		got := ReverseString(tc.input)
+		if got != tc.want {
+			t.Errorf("ReverseString(%s) = %s, want %s", tc.input, got, tc.want)
+		}
+	}
+}
diff --git a/reverse_string_230803/main_test.go b/reverse_string_230803/main_test.go
new file mode 100644
index 0000000..ff831d2
--- /dev/null
+++ b/reverse_string_230803/main_test.go
@@ -0,0 +1,32 @@
+package main
+
+import "testing"
+
+func ReverseString(s string) string {
+	tm := []byte(s)
+	l := len(s)
+	for i := 0; i < l/2; i++ {
+		tm[i], tm[l-1-i] = tm[l-1-i], tm[i]
+	}
+	return string(tm)
+}
+
+func TestReverseString(t *testing.T) {
+	tt := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{"1", "test", "tset"},
+		{"2", "testing", "gnitset"},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got := ReverseString(tc.input)
+			if got != tc.want {
+				t.Errorf("ReverseString(%s) = %s, want %s", tc.input, got, tc.want)
+			}
+		})
+	}
+}