feat: Add Comprehensive Testing Infrastructure (#31)

* feat: Testing Infrastructure changes

* Update version in Cargo.lock and refactor patch_test.rs

Based solely on the changes visible in the diff, this commit:

- Updates the version of 'git-ai' in Cargo.lock from '0.2.56' to '0.2.57'.
- Refactors 'patch_test.rs', introducing the 'TestRepository' trait, which provides a 'to_diff' method, and modifies the usage of the 'to_diff' method throughout the test file to now be associated with the 'TestRepository' trait.
- Removes the staging and committing operations in the 'test_patch_diff_to_patch' test.
- Adds new methods to capture diffs in different scenarios, such as staged changes, no staged changes, and initial state comparison against HEAD or working directory.

Please note this message only encompasses alterations marked with '+' or '-' in the diff.

---------

Co-authored-by: Git AI Test <[email protected]>

.gitignore

@@ -5,3 +5,4 @@ http-cacache/*
 .env.local
 ${env:TMPDIR}
 bin/
+tmp/

scripts/comprehensive-tests

@@ -0,0 +1,292 @@
+#!/usr/bin/env fish
+
+set -x fish_trace 1
+
+# Load environment variables from .env.local if it exists
+if test -f .env.local
+    for line in (cat .env.local)
+        if not string match -q "#*" $line # Skip comments
+            and test -n "$line" # Skip empty lines
+            set -l key (string split -m 1 = $line)[1]
+            set -l value (string split -m 1 = $line)[2]
+            # Remove quotes if they exist
+            set value (string trim -c '"' $value)
+            set value (string trim -c "'" $value)
+            set -gx $key $value
+        end
+    end
+else
+    echo "Warning: .env.local file not found. Make sure you have the required environment variables set."
+end
+
+set -Ux OPENAI_API_KEY $OPENAI_API_KEY
+set -x RUST_LOG debug
+
+if not test -n "$OPENAI_API_KEY"
+    echo "Please set the OPENAI_API_KEY environment variable."
+    exit 1
+end
+
+if not command -v cargo
+    echo "Cargo not found. Please install Rust."
+    exit 1
+end
+
+function on_exit --on-event fish_exit
+    if test -d $TEST_DIR
+        rm -rf $TEST_DIR
+    end
+end
+
+function generate_random_content
+    set size $argv[1]
+    head -c $size /dev/urandom | base64
+end
+
+function last_commit
+    git log -1 --pretty=%B | tr -d '\n'
+end
+
+function fail
+    echo "Test failed: $argv"
+    exit 1
+end
+
+function test_step
+    set description $argv[1]
+    echo "=== Testing: $description ==="
+end
+
+set TEST_DIR /tmp/git-ai-test-(date +%s)
+
+# Install git-ai
+cargo install --force --debug --path . || fail "Cargo installation failed"
+
+# Setup test repository
+rm -rf $TEST_DIR
+mkdir -p $TEST_DIR
+cd $TEST_DIR
+
+git init || fail "Git init failed"
+git config user.name "Test User"
+git config user.email "[email protected]"
+git config --global init.defaultBranch main
+git branch -m main
+
+# Test 1: Hook Installation and Configuration
+test_step "Hook Installation and Configuration"
+
+git-ai hook || echo "As expected"
+git-ai hook install || fail "Hook installation failed"
+git-ai hook uninstall || fail "Hook uninstallation failed"
+git-ai hook install || fail "Hook reinstallation failed"
+git-ai hook reinstall || fail "Hook reinstall failed"
+
+git-ai config reset
+git-ai config || echo "As expected"
+git-ai config set || echo "As expected"
+git-ai config set model gpt-4 || fail "Setting model failed"
+git-ai config set max-tokens 512 || fail "Setting max tokens failed"
+git-ai config set max-commit-length 1024 || fail "Setting max commit length failed"
+git-ai config set openai-api-key "$OPENAI_API_KEY" || fail "Setting OpenAI API key failed"
+
+# Test 2: Basic Git Operations
+test_step "Basic Git Operations"
+
+# 2.1 Initial commit
+echo "Hello World 0" >README.md
+git add README.md
+git status --porcelain || fail "Git status failed before initial commit"
+test -f README.md || fail "README.md was not created"
+git commit -m "Initial commit: Add README.md" || fail "Initial commit failed"
+git status --porcelain || fail "Git status failed after initial commit"
+
+# 2.2 Commit with message
+echo "Hello World" >README.md
+git add README.md
+git commit -m "Initial commit" || fail "Commit with message failed"
+last_commit | grep "Initial commit" || fail "Commit message 'Initial commit' not found"
+
+# 2.3 Commit with --no-edit
+echo "Hello World 2" >README.md
+git add README.md
+git commit --no-edit || fail "Commit --no-edit failed"
+git status --porcelain || fail "Git status failed after commit --no-edit"
+
+# Test 3: File Creation Permutations
+test_step "File Creation Permutations"
+
+# 3.1 Empty file
+touch empty_file.txt
+git add empty_file.txt
+git commit -a --no-edit || fail "Empty file commit failed"
+
+# 3.2 Multiple empty files
+touch empty1.txt empty2.txt empty3.txt
+git add .
+git commit -a --no-edit || fail "Multiple empty files commit failed"
+
+# 3.3 Files with different content types
+echo "Normal text" >normal.txt
+echo -e "Line 1\nLine 2\nLine 3" >multiline.txt
+echo -n "No newline" >no_newline.txt
+echo "Tab	Space Space  End" >whitespace.txt
+git add .
+git commit -a --no-edit || fail "Different content types commit failed"
+
+# Test 4: File Modification Permutations
+test_step "File Modification Permutations"
+
+# 4.1 Modify start of file
+echo "Modified start + Normal text" >normal.txt
+git commit -a --no-edit || fail "Start modification commit failed"
+
+# 4.2 Modify end of file
+echo -e "Line 1\nLine 2\nLine 3\nLine 4" >multiline.txt
+git commit -a --no-edit || fail "End modification commit failed"
+
+# 4.3 Modify middle of file
+echo -e "Line 1\nNew Line\nLine 3\nLine 4" >multiline.txt
+git commit -a --no-edit || fail "Middle modification commit failed"
+
+# Test 5: Advanced Git Operations
+test_step "Advanced Git Operations"
+
+# 5.1 Amend commit
+set prev_commit (last_commit)
+git commit --amend --no-edit || fail "Commit amend --no-edit failed"
+git status --porcelain || fail "Git status failed after amend --no-edit"
+last_commit | grep "$prev_commit" || fail "Amended commit message not found"
+
+# 5.2 Commit with template
+echo "Commit from template" >template.txt
+git add template.txt
+git commit -t template.txt --no-edit || true
+
+# 5.3 Squash commits
+echo "Squash test" >squash.txt
+git add squash.txt
+git commit -m "Pre-squash commit" || fail "Pre-squash commit failed"
+git reset --soft HEAD~1 || fail "Reset failed"
+git commit --squash HEAD~2 -m "Squashed commit" || fail "Squash commit failed"
+last_commit | grep "Squashed commit" || fail "Squash commit message not found"
+
+# Test 6: Branch and Merge Operations
+test_step "Branch and Merge Operations"
+
+# 6.1 Feature branch
+git checkout -b feature-branch || fail "Checkout to feature-branch failed"
+echo "Feature branch change" >feature.txt
+git add feature.txt
+git commit -m "Feature commit" || fail "Feature branch commit failed"
+last_commit | grep "Feature commit" || fail "Feature branch commit message not found"
+
+# 6.2 Merge
+git checkout main || fail "Checkout to main failed"
+git merge --no-edit --no-ff feature-branch || fail "Merge feature-branch failed"
+last_commit | grep "Merge branch 'feature-branch'" || fail "Merge commit message not found"
+
+# Test 7: File Operations
+test_step "File Operations"
+
+# 7.1 File deletions
+rm empty_file.txt
+git add --all
+git commit -a --no-edit || fail "Single deletion commit failed"
+
+rm empty1.txt empty2.txt
+git add --all
+git commit -a --no-edit || fail "Multiple deletions commit failed"
+
+# 7.2 Mixed operations
+touch new_file1.txt
+rm empty3.txt
+echo "Modified again" >normal.txt
+git add --all
+git commit -a --no-edit || fail "Mixed operations commit failed"
+
+# Test 8: Special Content
+test_step "Special Content"
+
+# 8.1 Binary and large files
+generate_random_content 1048576 >large_file.bin
+git add large_file.bin
+git commit -m "Add binary file large_file.bin (1MB)" || fail "Large file commit failed"
+
+# 8.2 Special characters
+echo "Special chars: ¡™£¢∞§¶•ªº" >special_chars.txt
+git add special_chars.txt
+git commit -a --no-edit || fail "Special chars commit failed"
+
+# 8.3 Unicode content
+echo "🚀 Unicode content 你好 привет" >unicode_file.txt
+git add unicode_file.txt
+git commit -a --no-edit || fail "Unicode commit failed"
+
+# Test 9: File System Operations
+test_step "File System Operations"
+
+# 9.1 Directory operations
+mkdir -p src/nested/deep
+echo "Moving file" >src/nested/deep/file.txt
+git add src
+git commit -a --no-edit || fail "Initial directory commit failed"
+git mv src dst
+git commit -a --no-edit || fail "Directory move commit failed"
+
+# 9.2 Symlink operations
+ln -s dst/nested/deep/file.txt symlink.txt
+git add symlink.txt
+git commit -a --no-edit || fail "Symlink creation commit failed"
+
+# 9.3 Permission changes
+chmod +x dst/nested/deep/file.txt
+git add --all
+git commit -a --no-edit || fail "Permission change commit failed"
+
+# Test 10: Edge Cases
+test_step "Edge Cases"
+
+# 10.1 Empty commit (should fail)
+if git commit --allow-empty --no-edit
+    fail "Empty commit should have failed but succeeded"
+end
+echo "Empty commit failed as expected"
+
+# 10.2 Case sensitivity
+echo "Case sensitive" >case.txt
+git add case.txt
+git commit -a --no-edit || fail "Case file commit failed"
+git mv case.txt CASE.txt
+git commit -a --no-edit || fail "Case rename commit failed"
+
+# 10.3 File/directory conversion
+rm dst/nested/deep/file.txt
+mkdir dst/nested/deep/file.txt
+echo "Now a directory" >dst/nested/deep/file.txt/content.txt
+git add --all
+git commit -a --no-edit || fail "File to directory commit failed"
+
+rm -rf dst/nested/deep/file.txt
+echo "Now a file again" >dst/nested/deep/file.txt
+git add --all
+git commit -a --no-edit || fail "Directory to file commit failed"
+
+# Test 11: Bulk Operations
+test_step "Bulk Operations"
+
+# 11.1 Many files
+for i in (seq 1 100)
+    echo "Content $i" >"file$i.txt"
+end
+git add .
+git commit -a --no-edit || fail "Many files commit failed"
+
+# 11.2 Many changes
+for i in (seq 1 1000)
+    echo "Line $i" >>large_changes.txt
+end
+git add large_changes.txt
+git commit -a --no-edit || fail "Many changes commit failed"
+
+echo "All comprehensive tests completed successfully!"