test(cmd/info): compare YAMLs after parsing

Instead of checking if the output YAML equals exactly to the expected
YAML by string checking, parse both YAMLs instead. Then compare to see
if they are equal.

cmd/chisel/cmd_info_test.go

@@ -1,11 +1,12 @@
 package main_test
 
 import (
+	"bytes"
 	"os"
 	"path/filepath"
-	"strings"
 
 	. "gopkg.in/check.v1"
+	"gopkg.in/yaml.v3"
 
 	chisel "github.com/canonical/chisel/cmd/chisel"
 	"github.com/canonical/chisel/internal/testutil"
@@ -243,6 +244,8 @@ func (s *ChiselSuite) TestInfoCommand(c *C) {
 	for _, test := range infoTests {
 		c.Logf("Summary: %s", test.summary)
 
+		s.ResetStdStreams()
+
 		dir := c.MkDir()
 		for path, data := range test.input {
 			fpath := filepath.Join(dir, path)
@@ -257,15 +260,24 @@ func (s *ChiselSuite) TestInfoCommand(c *C) {
 			prefix = append(prefix, "--release", dir)
 		}
 		test.query = append(prefix, test.query...)
-		test.stdout = strings.TrimPrefix(test.stdout, "\n")
 
 		_, err := chisel.Parser().ParseArgs(test.query)
 		if test.err != "" {
 			c.Assert(err, ErrorMatches, test.err)
+			continue
 		} else {
 			c.Assert(err, IsNil)
 		}
-		c.Assert(s.Stdout(), Equals, test.stdout)
-		s.ResetStdStreams()
+
+		// parse the expected and output YAMLs and compare
+		var testYAML interface{}
+		dec := yaml.NewDecoder(bytes.NewBuffer([]byte(test.stdout)))
+		err = dec.Decode(&testYAML)
+		c.Assert(err, IsNil)
+		var outputYAML interface{}
+		dec = yaml.NewDecoder(bytes.NewBuffer([]byte(s.Stdout())))
+		err = dec.Decode(&outputYAML)
+		c.Assert(err, IsNil)
+		c.Assert(testYAML, DeepEquals, outputYAML)
 	}
 }