From 5788c7976ec4d1631189a27b34ea2aace3b1957d Mon Sep 17 00:00:00 2001
From: Alisa Novikova <62909685+alisa-alisa@users.noreply.github.com>
Date: Fri, 13 Feb 2026 12:09:30 -0800
Subject: [PATCH] Adding evals for grep search

---
 evals/grep_search_functionality.eval.ts | 170 ++++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 evals/grep_search_functionality.eval.ts

diff --git a/evals/grep_search_functionality.eval.ts b/evals/grep_search_functionality.eval.ts
new file mode 100644
index 0000000000..77df3b950f
--- /dev/null
+++ b/evals/grep_search_functionality.eval.ts
@@ -0,0 +1,170 @@
+/**
+ * @license
+ * Copyright 202 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, expect } from 'vitest';
+import { evalTest, TestRig } from './test-helper.js';
+import {
+  assertModelHasOutput,
+  checkModelOutputContent,
+} from './test-helper.js';
+
+describe('grep_search_functionality', () => {
+  const TEST_PREFIX = 'Grep Search Functionality: ';
+
+  evalTest('USUALLY_PASSES', {
+    name: 'should find a simple string in a file',
+    files: {
+      'test.txt': `hello
+    world
+    hello world`,
+    },
+    prompt: 'Find "world" in test.txt',
+    assert: async (rig: TestRig, result: string) => {
+      await rig.waitForToolCall('grep_search');
+      assertModelHasOutput(result);
+      checkModelOutputContent(result, {
+        expectedContent: [/L2: world/, /L3: hello world/],
+        testName: `${TEST_PREFIX}simple search`,
+      });
+    },
+  });
+
+  evalTest('USUALLY_PASSES', {
+    name: 'should perform a case-sensitive search',
+    files: {
+      'test.txt': `Hello
+    hello`,
+    },
+    prompt: 'Find "Hello" in test.txt, case-sensitively.',
+    assert: async (rig: TestRig, result: string) => {
+      const wasToolCalled = await rig.waitForToolCall(
+        'grep_search',
+        undefined,
+        (args) => {
+          const params = JSON.parse(args);
+          return params.case_sensitive === true;
+        },
+      );
+      expect(
+        wasToolCalled,
+        'Expected grep_search to be called with case_sensitive: true',
+      ).toBe(true);
+
+      assertModelHasOutput(result);
+      checkModelOutputContent(result, {
+        expectedContent: [/L1: Hello/],
+        forbiddenContent: [/L2: hello/],
+        testName: `${TEST_PREFIX}case-sensitive search`,
+      });
+    },
+  });
+
+  evalTest('USUALLY_PASSES', {
+    name: 'should return only file names when names_only is used',
+    files: {
+      'file1.txt': 'match me',
+      'file2.txt': 'match me',
+    },
+    prompt: 'Find the files containing "match me".',
+    assert: async (rig: TestRig, result: string) => {
+      const wasToolCalled = await rig.waitForToolCall(
+        'grep_search',
+        undefined,
+        (args) => {
+          const params = JSON.parse(args);
+          return params.names_only === true;
+        },
+      );
+      expect(
+        wasToolCalled,
+        'Expected grep_search to be called with names_only: true',
+      ).toBe(true);
+
+      assertModelHasOutput(result);
+      checkModelOutputContent(result, {
+        expectedContent: [/file1.txt/, /file2.txt/],
+        forbiddenContent: [/L1:/],
+        testName: `${TEST_PREFIX}names_only search`,
+      });
+    },
+  });
+
+  evalTest('USUALLY_PASSES', {
+    name: 'should search only within the specified include glob',
+    files: {
+      'file.js': 'my_function();',
+      'file.ts': 'my_function();',
+    },
+    prompt: 'Find "my_function" in .js files.',
+    assert: async (rig: TestRig, result: string) => {
+      const wasToolCalled = await rig.waitForToolCall(
+        'grep_search',
+        undefined,
+        (args) => {
+          const params = JSON.parse(args);
+          return params.include === '*.js';
+        },
+      );
+      expect(
+        wasToolCalled,
+        'Expected grep_search to be called with include: "*.js"',
+      ).toBe(true);
+
+      assertModelHasOutput(result);
+      checkModelOutputContent(result, {
+        expectedContent: [/file.js/],
+        forbiddenContent: [/file.ts/],
+        testName: `${TEST_PREFIX}include glob search`,
+      });
+    },
+  });
+
+  evalTest('USUALLY_PASSES', {
+    name: 'should search within a specific subdirectory',
+    files: {
+      'src/main.js': 'unique_string_1',
+      'lib/main.js': 'unique_string_2',
+    },
+    prompt: 'Find "unique_string" in the src directory.',
+    assert: async (rig: TestRig, result: string) => {
+      const wasToolCalled = await rig.waitForToolCall(
+        'grep_search',
+        undefined,
+        (args) => {
+          const params = JSON.parse(args);
+          return params.dir_path === 'src';
+        },
+      );
+      expect(
+        wasToolCalled,
+        'Expected grep_search to be called with dir_path: "src"',
+      ).toBe(true);
+
+      assertModelHasOutput(result);
+      checkModelOutputContent(result, {
+        expectedContent: [/unique_string_1/],
+        forbiddenContent: [/unique_string_2/],
+        testName: `${TEST_PREFIX}subdirectory search`,
+      });
+    },
+  });
+
+  evalTest('USUALLY_PASSES', {
+    name: 'should report no matches correctly',
+    files: {
+      'file.txt': 'nothing to see here',
+    },
+    prompt: 'Find "nonexistent" in file.txt',
+    assert: async (rig: TestRig, result: string) => {
+      await rig.waitForToolCall('grep_search');
+      assertModelHasOutput(result);
+      checkModelOutputContent(result, {
+        expectedContent: [/No matches found/],
+        testName: `${TEST_PREFIX}no matches`,
+      });
+    },
+  });
+});