test: add Zig language integration tests

- Add test cases for function, struct, and mixed code extraction
- Add snapshot tests for validation
- Register Zig in test helper functions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: unhappychoice

tests/integration/languages/mod.rs

@@ -15,6 +15,7 @@ pub mod rust;
 pub mod scala;
 pub mod swift;
 pub mod typescript;
+pub mod zig;
 
 // Common typing core utilities
 pub mod typing_core_common;

tests/integration/languages/snapshots/r#mod__integration__languages__extractor__test_zig_function_extraction.snap

@@ -0,0 +1,41 @@
+---
+source: tests/integration/languages/extractor.rs
+expression: "serde_json::to_string_pretty(&snapshot_data).unwrap()"
+---
+{
+  "chunks": [
+    {
+      "chunk_type": "File",
+      "comment_ranges": [],
+      "content": "\npub fn add(a: i32, b: i32) i32 {\n    return a + b;\n}\n\nfn subtract(a: i32, b: i32) i32 {\n    return a - b;\n}\n",
+      "end_line": 8,
+      "language": "zig",
+      "name": "entire_file",
+      "original_indentation": 0,
+      "start_line": 1
+    },
+    {
+      "chunk_type": "Function",
+      "comment_ranges": [],
+      "content": "pub fn add(a: i32, b: i32) i32 {\n    return a + b;\n}",
+      "end_line": 4,
+      "language": "zig",
+      "name": "function",
+      "original_indentation": 0,
+      "start_line": 2
+    },
+    {
+      "chunk_type": "Function",
+      "comment_ranges": [],
+      "content": "fn subtract(a: i32, b: i32) i32 {\n    return a - b;\n}",
+      "end_line": 8,
+      "language": "zig",
+      "name": "function",
+      "original_indentation": 0,
+      "start_line": 6
+    }
+  ],
+  "source_code": "\npub fn add(a: i32, b: i32) i32 {\n    return a + b;\n}\n\nfn subtract(a: i32, b: i32) i32 {\n    return a - b;\n}\n",
+  "test_name": "test_zig_function_extraction",
+  "total_chunks": 3
+}

tests/integration/languages/snapshots/r#mod__integration__languages__extractor__test_zig_mixed_extraction.snap

@@ -0,0 +1,61 @@
+---
+source: tests/integration/languages/extractor.rs
+expression: "serde_json::to_string_pretty(&snapshot_data).unwrap()"
+---
+{
+  "chunks": [
+    {
+      "chunk_type": "File",
+      "comment_ranges": [],
+      "content": "\nconst std = @import(\"std\");\n\npub const Vector = struct {\n    x: f32,\n    y: f32,\n\n    pub fn init(x: f32, y: f32) Vector {\n        return Vector{ .x = x, .y = y };\n    }\n\n    pub fn length(self: Vector) f32 {\n        return @sqrt(self.x * self.x + self.y * self.y);\n    }\n};\n\npub fn main() !void {\n    const stdout = std.io.getStdOut().writer();\n    try stdout.print(\"Hello, Zig!\\n\", .{});\n}\n",
+      "end_line": 20,
+      "language": "zig",
+      "name": "entire_file",
+      "original_indentation": 0,
+      "start_line": 1
+    },
+    {
+      "chunk_type": "CodeBlock",
+      "comment_ranges": [],
+      "content": "pub const Vector = struct {\n    x: f32,\n    y: f32,\n\n    pub fn init(x: f32, y: f32) Vector {\n        return Vector{ .x = x, .y = y };\n    }\n\n    pub fn length(self: Vector) f32 {\n        return @sqrt(self.x * self.x + self.y * self.y);\n    }\n};",
+      "end_line": 15,
+      "language": "zig",
+      "name": "struct",
+      "original_indentation": 0,
+      "start_line": 4
+    },
+    {
+      "chunk_type": "Function",
+      "comment_ranges": [],
+      "content": "    pub fn init(x: f32, y: f32) Vector {\n        return Vector{ .x = x, .y = y };\n    }",
+      "end_line": 10,
+      "language": "zig",
+      "name": "function",
+      "original_indentation": 4,
+      "start_line": 8
+    },
+    {
+      "chunk_type": "Function",
+      "comment_ranges": [],
+      "content": "    pub fn length(self: Vector) f32 {\n        return @sqrt(self.x * self.x + self.y * self.y);\n    }",
+      "end_line": 14,
+      "language": "zig",
+      "name": "function",
+      "original_indentation": 4,
+      "start_line": 12
+    },
+    {
+      "chunk_type": "Function",
+      "comment_ranges": [],
+      "content": "pub fn main() !void {\n    const stdout = std.io.getStdOut().writer();\n    try stdout.print(\"Hello, Zig!\\n\", .{});\n}",
+      "end_line": 20,
+      "language": "zig",
+      "name": "function",
+      "original_indentation": 0,
+      "start_line": 17
+    }
+  ],
+  "source_code": "\nconst std = @import(\"std\");\n\npub const Vector = struct {\n    x: f32,\n    y: f32,\n\n    pub fn init(x: f32, y: f32) Vector {\n        return Vector{ .x = x, .y = y };\n    }\n\n    pub fn length(self: Vector) f32 {\n        return @sqrt(self.x * self.x + self.y * self.y);\n    }\n};\n\npub fn main() !void {\n    const stdout = std.io.getStdOut().writer();\n    try stdout.print(\"Hello, Zig!\\n\", .{});\n}\n",
+  "test_name": "test_zig_mixed_extraction",
+  "total_chunks": 5
+}

tests/integration/languages/snapshots/r#mod__integration__languages__extractor__test_zig_struct_extraction.snap

@@ -0,0 +1,41 @@
+---
+source: tests/integration/languages/extractor.rs
+expression: "serde_json::to_string_pretty(&snapshot_data).unwrap()"
+---
+{
+  "chunks": [
+    {
+      "chunk_type": "File",
+      "comment_ranges": [],
+      "content": "\nconst Point = struct {\n    x: f32,\n    y: f32,\n};\n\npub const Config = struct {\n    debug: bool,\n    verbose: bool,\n};\n",
+      "end_line": 10,
+      "language": "zig",
+      "name": "entire_file",
+      "original_indentation": 0,
+      "start_line": 1
+    },
+    {
+      "chunk_type": "CodeBlock",
+      "comment_ranges": [],
+      "content": "const Point = struct {\n    x: f32,\n    y: f32,\n};",
+      "end_line": 5,
+      "language": "zig",
+      "name": "struct",
+      "original_indentation": 0,
+      "start_line": 2
+    },
+    {
+      "chunk_type": "CodeBlock",
+      "comment_ranges": [],
+      "content": "pub const Config = struct {\n    debug: bool,\n    verbose: bool,\n};",
+      "end_line": 10,
+      "language": "zig",
+      "name": "struct",
+      "original_indentation": 0,
+      "start_line": 7
+    }
+  ],
+  "source_code": "\nconst Point = struct {\n    x: f32,\n    y: f32,\n};\n\npub const Config = struct {\n    debug: bool,\n    verbose: bool,\n};\n",
+  "test_name": "test_zig_struct_extraction",
+  "total_chunks": 3
+}

tests/integration/languages/zig/extractor.rs

@@ -0,0 +1,75 @@
+use crate::integration::languages::extractor::test_language_extractor;
+
+test_language_extractor! {
+    name: test_zig_function_extraction,
+    language: "zig",
+    extension: "zig",
+    source: r#"
+pub fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+
+fn subtract(a: i32, b: i32) i32 {
+    return a - b;
+}
+"#,
+    total_chunks: 3,
+    chunk_counts: {
+        File: 1,
+        Function: 2,
+    }
+}
+
+test_language_extractor! {
+    name: test_zig_struct_extraction,
+    language: "zig",
+    extension: "zig",
+    source: r#"
+const Point = struct {
+    x: f32,
+    y: f32,
+};
+
+pub const Config = struct {
+    debug: bool,
+    verbose: bool,
+};
+"#,
+    total_chunks: 3,
+    chunk_counts: {
+        File: 1,
+        Function: 0,
+    }
+}
+
+test_language_extractor! {
+    name: test_zig_mixed_extraction,
+    language: "zig",
+    extension: "zig",
+    source: r#"
+const std = @import("std");
+
+pub const Vector = struct {
+    x: f32,
+    y: f32,
+
+    pub fn init(x: f32, y: f32) Vector {
+        return Vector{ .x = x, .y = y };
+    }
+
+    pub fn length(self: Vector) f32 {
+        return @sqrt(self.x * self.x + self.y * self.y);
+    }
+};
+
+pub fn main() !void {
+    const stdout = std.io.getStdOut().writer();
+    try stdout.print("Hello, Zig!\n", .{});
+}
+"#,
+    total_chunks: 5,
+    chunk_counts: {
+        File: 1,
+        Function: 3,
+    }
+}

tests/integration/languages/zig/mod.rs

@@ -0,0 +1 @@
+pub mod extractor;

tests/integration/mod.rs

@@ -66,6 +66,7 @@ fn string_to_language_obj(language: &str) -> &'static dyn Language {
         "scala" => &Scala,
         "swift" => &Swift,
         "typescript" => &TypeScript,
+        "zig" => &Zig,
         _ => panic!("Unsupported language: {}", language),
     }
 }