update

mathx/math_test.go

@@ -0,0 +1,54 @@
+package mathx_test
+
+import (
+	"testing"
+
+	"github.com/charlienet/go-mixed/mathx"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMin(t *testing.T) {
+	assert.Equal(t, 1, mathx.Min(1, 3))
+	assert.Equal(t, 2, mathx.Min(66, 2))
+}
+
+func TestMax(t *testing.T) {
+	assert.Equal(t, 3, mathx.Max(1, 3))
+	assert.Equal(t, 66, mathx.Max(66, 2))
+}
+
+func TestAbs(t *testing.T) {
+	assert.Equal(t, 23, mathx.Abs(23))
+	assert.Equal(t, 23, mathx.Abs(-23))
+	assert.Equal(t, 0, mathx.Abs(0))
+
+	var u int8 = -127
+	var exp int8 = 127
+	assert.Equal(t, exp, mathx.Abs(u))
+
+	assert.Equal(t, 1.23, mathx.Abs(-1.23))
+}
+
+func TestClamp(t *testing.T) {
+	tests := []struct{ value, min, max, want int }{
+		// Min.
+		{-1, 0, 2, 0},
+		{0, 0, 2, 0},
+		// Mid.
+		{1, 0, 2, 1},
+		{2, 0, 2, 2},
+		// Max.
+		{2, 0, 2, 2},
+		{3, 0, 2, 2},
+		// Empty range.
+		{-1, 0, 0, 0},
+		{0, 0, 0, 0},
+		{1, 0, 0, 0},
+	}
+	for _, test := range tests {
+		got := mathx.Clamp(test.value, test.min, test.max)
+		if got != test.want {
+			t.Errorf("Clamp(%v, %v, %v) = %v, want %v", test.value, test.min, test.max, got, test.want)
+		}
+	}
+}