Add basic tests on config, mainly to raise test coverage

config/config_test.go

@@ -0,0 +1,28 @@
+package config
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDefaultConfig(t *testing.T) {
+	assert := assert.New(t)
+
+	// set up some defaults
+	cfg := DefaultConfig()
+	assert.NotNil(cfg.P2P)
+	assert.NotNil(cfg.Mempool)
+	assert.NotNil(cfg.Consensus)
+
+	// check the root dir stuff...
+	cfg.SetRoot("/foo")
+	cfg.Genesis = "bar"
+	cfg.DBPath = "/opt/data"
+	cfg.Mempool.WalPath = "wal/mem/"
+
+	assert.Equal("/foo/bar", cfg.GenesisFile())
+	assert.Equal("/opt/data", cfg.DBDir())
+	assert.Equal("/foo/wal/mem", cfg.Mempool.WalDir())
+
+}