feat(render): experimental package to render arbitrary values to different formats

json_test.go

@@ -0,0 +1,79 @@
+package render_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/jimeh/go-render"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestJSON_Render(t *testing.T) {
+	tests := []struct {
+		name      string
+		pretty    bool
+		prefix    string
+		indent    string
+		value     interface{}
+		want      string
+		wantErr   string
+		wantErrIs []error
+	}{
+		{
+			name:   "simple object without pretty",
+			pretty: false,
+			value:  map[string]int{"age": 30},
+			want:   "{\"age\":30}\n",
+		},
+		{
+			name:   "simple object with pretty",
+			pretty: true,
+			indent: "  ",
+			value:  map[string]int{"age": 30},
+			want:   "{\n  \"age\": 30\n}\n",
+		},
+		{
+			name:   "with prefix and indent",
+			pretty: true,
+			prefix: "// ",
+			indent: "\t",
+			value:  map[string]int{"age": 30},
+			want:   "{\n// \t\"age\": 30\n// }\n",
+		},
+		{
+			name:      "invalid value",
+			pretty:    false,
+			value:     make(chan int),
+			wantErr:   "render: json: unsupported type: chan int",
+			wantErrIs: []error{render.Err},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			j := &render.JSON{
+				Pretty: tt.pretty,
+				Prefix: tt.prefix,
+				Indent: tt.indent,
+			}
+
+			var buf bytes.Buffer
+			err := j.Render(&buf, tt.value)
+
+			if tt.wantErr != "" {
+				require.Error(t, err)
+				assert.EqualError(t, err, tt.wantErr)
+			}
+			for _, e := range tt.wantErrIs {
+				assert.ErrorIs(t, err, e)
+			}
+
+			if tt.wantErr == "" && len(tt.wantErrIs) == 0 {
+				require.NoError(t, err)
+				got := buf.String()
+				assert.Equal(t, tt.want, got)
+			}
+		})
+	}
+}