Add pin.go unit test

Author: cpacia

ipfs/pin_test.go

@@ -0,0 +1,25 @@
+package ipfs
+
+import (
+	"path"
+	"testing"
+)
+
+func TestUnPinDir(t *testing.T) {
+	ctx, err := MockCmdsCtx()
+	if err != nil {
+		t.Error(err)
+	}
+	root, err := AddDirectory(ctx, path.Join("./", "root"))
+	if err != nil {
+		t.Error(err)
+	}
+	err = UnPinDir(ctx, root)
+	if err != nil {
+		t.Error(err)
+	}
+	err = UnPinDir(ctx, "fasdfasdf")
+	if err == nil {
+		t.Error("Should have through error unpinning known directory")
+	}
+}