requirejson: add ParseFromFile function

Add `ParseFromFile` function, to make it more convienet when reading
from files.

Author: alessio-perugini

Diff for: requirejson/json.go

@@ -9,6 +9,7 @@ package requirejson
 import (
 	"encoding/json"
 	"fmt"
+	"os"
 	"testing"
 
 	"github.com/itchyny/gojq"
@@ -35,6 +36,16 @@ func Parse(t *testing.T, jsonData []byte, msgAndArgs ...interface{}) *JQObject {
 	return &JQObject{t: t, data: data}
 }
 
+// ParseFromFile creates a new JQObect from the given file path.
+// If the file is not a valid json the test fails.
+func ParseFromFile(t *testing.T, filePath string, msgAndArgs ...interface{}) *JQObject {
+	var data interface{}
+	jsonData, err := os.ReadFile(filePath)
+	require.NoError(t, err, msgAndArgs...)
+	require.NoError(t, json.Unmarshal(jsonData, &data), msgAndArgs...)
+	return &JQObject{t: t, data: data}
+}
+
 // Query performs a query on the given JQObject and returns the first result. If the query
 // produces no result the test will fail.
 func (obj *JQObject) Query(jqQuery string) *JQObject {

Diff for: requirejson/json_test.go

@@ -7,8 +7,10 @@
 package requirejson_test
 
 import (
+	"os"
 	"testing"
 
+	"github.com/stretchr/testify/require"
 	"go.bug.st/testifyjson/requirejson"
 )
 
@@ -68,3 +70,26 @@ func TestJSONAssertions(t *testing.T) {
 
 	requirejson.Parse(t, in).Query(".list").ArrayMustContain("20")
 }
+
+func TestParseFromFile(t *testing.T) {
+	in := []byte(`
+{
+	"id" : 1,
+	"list" : [
+		10, 20, 30
+	]
+}
+`)
+
+	tmpDir := t.TempDir()
+	testFile, err := os.CreateTemp(tmpDir, "test.json")
+	require.NoError(t, err)
+	_, err = testFile.Write(in)
+	require.NoError(t, err)
+	require.NoError(t, testFile.Close())
+
+	obj := requirejson.ParseFromFile(t, testFile.Name())
+	obj.Query(".id").MustEqual("1")
+	obj.Query(".list").ArrayMustContain("20")
+	obj.Query(".list | length").MustEqual("3")
+}