test: 添加单元测试（config/services/handlers，共 59 个用例）

services/review_test.go

@@ -0,0 +1,107 @@
+package services
+
+import "testing"
+
+func TestCountDiffLines(t *testing.T) {
+	tests := []struct {
+		name  string
+		patch string
+		want  int
+	}{
+		{
+			name: "standard diff with additions and deletions",
+			patch: `--- a/file.go
++++ b/file.go
+@@ -1,5 +1,6 @@
+ package main
++import "fmt"
++import "os"
+-func old() {}
++func new() {}
+ func keep() {}`,
+			want: 4, // +import, +import, -func, +func
+		},
+		{
+			name:  "only additions",
+			patch: "+++ b/file.go\n@@ -0,0 +1,3 @@\n+line1\n+line2\n+line3",
+			want:  3,
+		},
+		{
+			name:  "only deletions",
+			patch: "--- a/file.go\n@@ -1,3 +0,0 @@\n-line1\n-line2\n-line3",
+			want:  3,
+		},
+		{
+			name:  "empty patch",
+			patch: "",
+			want:  0,
+		},
+		{
+			name: "context only lines (no +/- prefix)",
+			patch: `@@ -1,3 +1,3 @@
+ func unchanged() {}
+ 	return nil
+ }`,
+			want: 0,
+		},
+		{
+			name: "header lines excluded",
+			patch: `--- a/old.go
++++ b/new.go
+@@ -1 +1 @@
+-old
++new`,
+			want: 2, // -old and +new (headers excluded)
+		},
+		{
+			name:  "mixed content with no changes",
+			patch: "just some\nplain text\nlines",
+			want:  0,
+		},
+		{
+			name:  "single addition",
+			patch: "+added line",
+			want:  1,
+		},
+		{
+			name:  "single deletion",
+			patch: "-removed line",
+			want:  1,
+		},
+		{
+			name:  "line starting with plus in content context",
+			patch: " +not a change, just context\n+actual addition",
+			want:  1, // only the line starting with + at position 0
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := countDiffLines(tt.patch)
+			if got != tt.want {
+				t.Errorf("countDiffLines() = %d, want %d", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestCountDiffLines_MultiFileDiff(t *testing.T) {
+	patch := `--- a/file1.go
++++ b/file1.go
+@@ -1,3 +1,4 @@
+ package main
++import "fmt"
+ func main() {
++	fmt.Println("hello")
+ }
+--- a/file2.go
++++ b/file2.go
+@@ -1,2 +1,2 @@
+-old line
++new line`
+	got := countDiffLines(patch)
+	want := 4 // +import, +fmt.Println, -old line, +new line
+	if got != want {
+		t.Errorf("countDiffLines() = %d, want %d", got, want)
+	}
+}