diff --git a/test/RepositoryInterface.t.sol b/test/RepositoryInterface.t.sol
new file mode 100644
index 0000000..131697f
--- /dev/null
+++ b/test/RepositoryInterface.t.sol
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "forge-std/Test.sol";
+import "../contracts/interfaces/RepositoryInterface.sol";
+
+contract RepositoryInterfaceTest is Test {
+    RepositoryInterface repositoryContract;
+    address testOwner;
+    address testContributor;
+
+    function setUp() public {
+        testOwner = makeAddr("testOwner");
+        testContributor = makeAddr("testContributor");
+        vm.prank(testOwner);
+        repositoryContract = new RepositoryInterface();
+    }
+
+    function test_CreateRepository() public {
+        vm.prank(testOwner);
+        bytes32 repositoryId = repositoryContract.createRepository(
+            "Test Repo", 
+            "A test repository", 
+            RepositoryInterface.AccessLevel.PUBLIC
+        );
+
+        assertNotEq(repositoryId, bytes32(0), "Repository creation should return a valid ID");
+    }
+
+    function testRevert_CreateRepository_EmptyName() public {
+        vm.expectRevert("Repository name cannot be empty");
+        vm.prank(testOwner);
+        repositoryContract.createRepository(
+            "", 
+            "A test repository", 
+            RepositoryInterface.AccessLevel.PUBLIC
+        );
+    }
+
+    function test_AddRepositoryEntry() public {
+        vm.prank(testOwner);
+        bytes32 repositoryId = repositoryContract.createRepository(
+            "Test Repo", 
+            "A test repository", 
+            RepositoryInterface.AccessLevel.PUBLIC
+        );
+
+        bytes32 contentHash = keccak256(abi.encodePacked("test content"));
+        
+        vm.prank(testContributor);
+        bytes32 entryId = repositoryContract.addRepositoryEntry(
+            repositoryId, 
+            contentHash, 
+            "Test entry metadata"
+        );
+
+        assertNotEq(entryId, bytes32(0), "Entry addition should return a valid ID");
+    }
+
+    function testRevert_AddRepositoryEntry_InvalidRepository() public {
+        bytes32 invalidRepositoryId = keccak256(abi.encodePacked("invalid"));
+        bytes32 contentHash = keccak256(abi.encodePacked("test content"));
+
+        vm.expectRevert("Invalid repository");
+        vm.prank(testContributor);
+        repositoryContract.addRepositoryEntry(
+            invalidRepositoryId, 
+            contentHash, 
+            "Test entry metadata"
+        );
+    }
+
+    function test_UpdateRepositoryEntry() public {
+        vm.prank(testOwner);
+        bytes32 repositoryId = repositoryContract.createRepository(
+            "Test Repo", 
+            "A test repository", 
+            RepositoryInterface.AccessLevel.PUBLIC
+        );
+
+        bytes32 contentHash = keccak256(abi.encodePacked("test content"));
+        
+        vm.prank(testContributor);
+        bytes32 entryId = repositoryContract.addRepositoryEntry(
+            repositoryId, 
+            contentHash, 
+            "Test entry metadata"
+        );
+
+        bytes32 newContentHash = keccak256(abi.encodePacked("updated content"));
+        
+        vm.prank(testContributor);
+        repositoryContract.updateRepositoryEntry(
+            repositoryId, 
+            entryId, 
+            newContentHash, 
+            "Updated metadata"
+        );
+
+        RepositoryInterface.RepositoryEntry memory updatedEntry = repositoryContract.getRepositoryEntry(
+            repositoryId, 
+            entryId
+        );
+
+        assertEq(updatedEntry.contentHash, newContentHash, "Content hash should be updated");
+    }
+
+    function testRevert_UpdateRepositoryEntry_UnauthorizedUser() public {
+        vm.prank(testOwner);
+        bytes32 repositoryId = repositoryContract.createRepository(
+            "Test Repo", 
+            "A test repository", 
+            RepositoryInterface.AccessLevel.PUBLIC
+        );
+
+        bytes32 contentHash = keccak256(abi.encodePacked("test content"));
+        
+        vm.prank(testContributor);
+        bytes32 entryId = repositoryContract.addRepositoryEntry(
+            repositoryId, 
+            contentHash, 
+            "Test entry metadata"
+        );
+
+        address unauthorized = makeAddr("unauthorized");
+        bytes32 newContentHash = keccak256(abi.encodePacked("updated content"));
+        
+        vm.expectRevert("Unauthorized to update entry");
+        vm.prank(unauthorized);
+        repositoryContract.updateRepositoryEntry(
+            repositoryId, 
+            entryId, 
+            newContentHash, 
+            "Updated metadata"
+        );
+    }
+
+    function testFuzz_CreateRepositoryWithVariedNames(string memory name) public {
+        vm.assume(bytes(name).length > 0 && bytes(name).length <= 50);
+        
+        vm.prank(testOwner);
+        bytes32 repositoryId = repositoryContract.createRepository(
+            name, 
+            "Fuzzy test repository", 
+            RepositoryInterface.AccessLevel.PUBLIC
+        );
+
+        assertNotEq(repositoryId, bytes32(0), "Repository creation should succeed with valid name");
+    }
+
+    function test_GetRepositoryEntryCount() public {
+        vm.prank(testOwner);
+        bytes32 repositor
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