Split out maths functions into maths, vector and bearing

pkg/bearing/bearing_test.go

@@ -0,0 +1,32 @@
+package bearing
+
+import (
+	"testing"
+
+	"github.com/mdiluz/rove/pkg/vector"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDirection(t *testing.T) {
+	dir := North
+
+	assert.Equal(t, "North", dir.String())
+	assert.Equal(t, "N", dir.ShortString())
+	assert.Equal(t, vector.Vector{X: 0, Y: 1}, dir.Vector())
+
+	dir, err := DirectionFromString("N")
+	assert.NoError(t, err)
+	assert.Equal(t, North, dir)
+
+	dir, err = DirectionFromString("n")
+	assert.NoError(t, err)
+	assert.Equal(t, North, dir)
+
+	dir, err = DirectionFromString("north")
+	assert.NoError(t, err)
+	assert.Equal(t, North, dir)
+
+	dir, err = DirectionFromString("NorthWest")
+	assert.NoError(t, err)
+	assert.Equal(t, NorthWest, dir)
+}