zapx: add test for log builder

.gitignore

@@ -1 +1,2 @@
 vendor
+tmp

zapx_test.go

@@ -0,0 +1,38 @@
+package zapx
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNew(t *testing.T) {
+	type args struct {
+		logpath string
+		dev     bool
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{"dev-no-path", args{"", true}, false},
+		{"prod-no-path", args{"", false}, false},
+		{"dev-with-path", args{"./tmp/log", true}, false},
+		{"prod-with-path", args{"./tmp/log", false}, false},
+		{"bad-dir-dev", args{"/root/toor", true}, true},
+		{"bad-dir-prod", args{"/root/toor", false}, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := New(tt.args.logpath, tt.args.dev)
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				assert.NotNil(t, got)
+			}
+		})
+	}
+}