Switch asserts to require (#1483)

* meta: Switch the majority of asserts to require

Switch most assert statements to require, to ease debugging.
Closes #1418

* Fix imports

server/mock/app_test.go

@@ -3,7 +3,6 @@ package mock
 import (
 	"testing"
 
-	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	abci "github.com/tendermint/tendermint/abci/types"
@@ -38,7 +37,7 @@ func TestInitApp(t *testing.T) {
 	}
 	qres := app.Query(query)
 	require.Equal(t, uint32(0), qres.Code, qres.Log)
-	assert.Equal(t, []byte("bar"), qres.Value)
+	require.Equal(t, []byte("bar"), qres.Value)
 }
 
 // TextDeliverTx ensures we can write a tx
@@ -74,5 +73,5 @@ func TestDeliverTx(t *testing.T) {
 	}
 	qres := app.Query(query)
 	require.Equal(t, uint32(0), qres.Code, qres.Log)
-	assert.Equal(t, []byte(value), qres.Value)
+	require.Equal(t, []byte(value), qres.Value)
 }

server/mock/store_test.go

@@ -3,7 +3,7 @@ package mock
 import (
 	"testing"
 
-	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	dbm "github.com/tendermint/tmlibs/db"
 
@@ -17,17 +17,17 @@ func TestStore(t *testing.T) {
 	key := sdk.NewKVStoreKey("test")
 	cms.MountStoreWithDB(key, sdk.StoreTypeIAVL, db)
 	err := cms.LoadLatestVersion()
-	assert.Nil(t, err)
+	require.Nil(t, err)
 
 	store := cms.GetKVStore(key)
-	assert.NotNil(t, store)
+	require.NotNil(t, store)
 
 	k := []byte("hello")
 	v := []byte("world")
-	assert.False(t, store.Has(k))
+	require.False(t, store.Has(k))
 	store.Set(k, v)
-	assert.True(t, store.Has(k))
-	assert.Equal(t, v, store.Get(k))
+	require.True(t, store.Has(k))
+	require.Equal(t, v, store.Get(k))
 	store.Delete(k)
-	assert.False(t, store.Has(k))
+	require.False(t, store.Has(k))
 }

server/util_test.go

@@ -5,7 +5,6 @@ import (
 	"testing"
 
 	"github.com/cosmos/cosmos-sdk/wire"
-	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -37,5 +36,5 @@ func TestAppendJSON(t *testing.T) {
 	err = cdc.UnmarshalJSON(appended["barOuter"], &resBar)
 	require.NoError(t, err)
 
-	assert.Equal(t, bar, resBar, "appended: %v", appended)
+	require.Equal(t, bar, resBar, "appended: %v", appended)
 }