Move implementation files to yqlib and test packages to allow for imports:

- Move data_navigator, json_converter, merge, and path_parser to pkg/yqlib
- Extract yamlToString from yq to pkg/yqlib/yaml_converter
- Move utils_test to test/utils

test/utils.go

@@ -0,0 +1,82 @@
+package test
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"reflect"
+	"strings"
+	"testing"
+
+	yaml "github.com/mikefarah/yaml/v2"
+	"github.com/spf13/cobra"
+)
+
+type resulter struct {
+	Error   error
+	Output  string
+	Command *cobra.Command
+}
+
+func RunCmd(c *cobra.Command, input string) resulter {
+	buf := new(bytes.Buffer)
+	c.SetOutput(buf)
+	c.SetArgs(strings.Split(input, " "))
+
+	err := c.Execute()
+	output := buf.String()
+
+	return resulter{err, output, c}
+}
+
+func ParseData(rawData string) yaml.MapSlice {
+	var parsedData yaml.MapSlice
+	err := yaml.Unmarshal([]byte(rawData), &parsedData)
+	if err != nil {
+		fmt.Printf("Error parsing yaml: %v\n", err)
+		os.Exit(1)
+	}
+	return parsedData
+}
+
+func AssertResult(t *testing.T, expectedValue interface{}, actualValue interface{}) {
+	t.Helper()
+	if expectedValue != actualValue {
+		t.Error("Expected <", expectedValue, "> but got <", actualValue, ">", fmt.Sprintf("%T", actualValue))
+	}
+}
+
+func AssertResultComplex(t *testing.T, expectedValue interface{}, actualValue interface{}) {
+	t.Helper()
+	if !reflect.DeepEqual(expectedValue, actualValue) {
+		t.Error("Expected <", expectedValue, "> but got <", actualValue, ">", fmt.Sprintf("%T", actualValue))
+	}
+}
+
+func AssertResultWithContext(t *testing.T, expectedValue interface{}, actualValue interface{}, context interface{}) {
+	t.Helper()
+	if expectedValue != actualValue {
+		t.Error(context)
+		t.Error(": expected <", expectedValue, "> but got <", actualValue, ">")
+	}
+}
+
+func WriteTempYamlFile(content string) string {
+	tmpfile, _ := ioutil.TempFile("", "testyaml")
+	defer func() {
+		_ = tmpfile.Close()
+	}()
+
+	_, _ = tmpfile.Write([]byte(content))
+	return tmpfile.Name()
+}
+
+func ReadTempYamlFile(name string) string {
+	content, _ := ioutil.ReadFile(name)
+	return string(content)
+}
+
+func RemoveTempYamlFile(name string) {
+	_ = os.Remove(name)
+}