DEV-765 pipeline refactor (#64)

Refactor rulesets into smaller composable operations

In order to mix up the functionality from different rulesets like Solo, Royale, etc. the code in these classes needs to be broken up into small functions that can be composed in a pipeline to make a custom game mode.

wrapped_test.go

@@ -3,6 +3,7 @@ package rules
 import (
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -247,6 +248,20 @@ func TestEdgeCrossingEating(t *testing.T) {
 	}
 }
 
+func TestWrap(t *testing.T) {
+	// no wrap
+	assert.Equal(t, int32(0), wrap(0, 0, 0))
+	assert.Equal(t, int32(0), wrap(0, 1, 0))
+	assert.Equal(t, int32(0), wrap(0, 0, 1))
+	assert.Equal(t, int32(1), wrap(1, 0, 1))
+
+	// wrap to min
+	assert.Equal(t, int32(0), wrap(2, 0, 1))
+
+	// wrap to max
+	assert.Equal(t, int32(1), wrap(-1, 0, 1))
+}
+
 // Checks that snakes moving out of bounds get wrapped to the other side.
 var wrappedCaseMoveAndWrap = gameTestCase{
 	"Wrapped Case Move and Wrap",