diff --git a/internal/hook/request_test.go b/internal/hook/request_test.go
new file mode 100644
index 0000000..ce74e4a
--- /dev/null
+++ b/internal/hook/request_test.go
@@ -0,0 +1,164 @@
+package hook
+
+import (
+	"encoding/json"
+	"reflect"
+	"testing"
+)
+
+var parseJSONPayloadTests = []struct {
+	body    []byte
+	payload map[string]interface{}
+	ok      bool
+}{
+	{[]byte(`[1,2,3]`), map[string]interface{}{"root": []interface{}{json.Number("1"), json.Number("2"), json.Number("3")}}, true},
+	{[]byte(`  [1,2,3]`), map[string]interface{}{"root": []interface{}{json.Number("1"), json.Number("2"), json.Number("3")}}, true},
+	{[]byte(`{"key": "value"}`), map[string]interface{}{"key": "value"}, true},
+	{[]byte(`[1, {"]`), map[string]interface{}(nil), false},
+	{[]byte(`{"key": "value}`), map[string]interface{}(nil), false},
+}
+
+func TestParseJSONPayload(t *testing.T) {
+	for _, tt := range parseJSONPayloadTests {
+		r := Request{
+			Body: tt.body,
+		}
+		err := r.ParseJSONPayload()
+		if (err == nil) != tt.ok {
+			t.Errorf("unexpected result given %q: %s\n", string(tt.body), err)
+		}
+
+		if !reflect.DeepEqual(tt.payload, r.Payload) {
+			t.Errorf("failed to parse json %q:\nexpected %#v,\ngot %#v", string(tt.body), tt.payload, r.Payload)
+		}
+	}
+}
+
+var parseHeadersTests = []struct {
+	headers         map[string][]string
+	expectedHeaders map[string]interface{}
+}{
+	{
+		map[string][]string{"header1": {"12"}},
+		map[string]interface{}{"header1": "12"},
+	},
+	{
+		map[string][]string{"header1": {"12", "34"}},
+		map[string]interface{}{"header1": "12"},
+	},
+	{
+		map[string][]string{"header1": {}},
+		map[string]interface{}{},
+	},
+}
+
+func TestParseHeaders(t *testing.T) {
+	for _, tt := range parseHeadersTests {
+		r := Request{}
+		r.ParseHeaders(tt.headers)
+
+		if !reflect.DeepEqual(tt.expectedHeaders, r.Headers) {
+			t.Errorf("failed to parse headers %#v:\nexpected %#v,\ngot %#v", tt.headers, tt.expectedHeaders, r.Headers)
+		}
+	}
+}
+
+var parseQueryTests = []struct {
+	query         map[string][]string
+	expectedQuery map[string]interface{}
+}{
+	{
+		map[string][]string{"query1": {"12"}},
+		map[string]interface{}{"query1": "12"},
+	},
+	{
+		map[string][]string{"query1": {"12", "34"}},
+		map[string]interface{}{"query1": "12"},
+	},
+	{
+		map[string][]string{"query1": {}},
+		map[string]interface{}{},
+	},
+}
+
+func TestParseQuery(t *testing.T) {
+	for _, tt := range parseQueryTests {
+		r := Request{}
+		r.ParseQuery(tt.query)
+
+		if !reflect.DeepEqual(tt.expectedQuery, r.Query) {
+			t.Errorf("failed to parse query %#v:\nexpected %#v,\ngot %#v", tt.query, tt.expectedQuery, r.Query)
+		}
+	}
+}
+
+var parseFormPayloadTests = []struct {
+	body            []byte
+	expectedPayload map[string]interface{}
+	ok              bool
+}{
+	{
+		[]byte("x=1&y=2"),
+		map[string]interface{}{"x": "1", "y": "2"},
+		true,
+	},
+	{
+		[]byte("x=1&y=2&y=3"),
+		map[string]interface{}{"x": "1", "y": "2"},
+		true,
+	},
+	{
+		[]byte(";"),
+		map[string]interface{}(nil),
+		false,
+	},
+}
+
+func TestParseFormPayload(t *testing.T) {
+	for _, tt := range parseFormPayloadTests {
+		r := Request{
+			Body: tt.body,
+		}
+		err := r.ParseFormPayload()
+		if (err == nil) != tt.ok {
+			t.Errorf("unexpected result given %q: %s\n", string(tt.body), err)
+		}
+
+		if !reflect.DeepEqual(tt.expectedPayload, r.Payload) {
+			t.Errorf("failed to parse form payload %q:\nexpected %#v,\ngot %#v", string(tt.body), tt.expectedPayload, r.Payload)
+		}
+	}
+}
+
+var parseXMLPayloadTests = []struct {
+	body            []byte
+	expectedPayload map[string]interface{}
+	ok              bool
+}{
+	{
+		[]byte("<x>1</x>"),
+		map[string]interface{}{"x": "1"},
+		true,
+	},
+	{
+		[]byte("<x>1<x>"),
+		map[string]interface{}(nil),
+		false,
+	},
+}
+
+func TestParseXMLPayload(t *testing.T) {
+	for _, tt := range parseXMLPayloadTests {
+		r := Request{
+			Body: tt.body,
+		}
+		err := r.ParseXMLPayload()
+		if (err == nil) != tt.ok {
+			t.Errorf("unexpected result given %q: %s\n", string(tt.body), err)
+		}
+
+		if !reflect.DeepEqual(tt.expectedPayload, r.Payload) {
+			t.Errorf("failed to parse xml %q:\nexpected %#v,\ngot %#v", string(tt.body), tt.expectedPayload, r.Payload)
+		}
+	}
+}