diff --git a/cmd/files_test.go b/cmd/files_test.go
new file mode 100644
index 0000000..6b4a597
--- /dev/null
+++ b/cmd/files_test.go
@@ -0,0 +1,143 @@
+package cmd
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestMatchGlob(t *testing.T) {
+	tests := []struct {
+		pattern  string
+		path     string
+		expected bool
+	}{
+		{"*.go", "file.go", true},
+		{"*.go", "file.txt", false},
+		{"**/*.go", "dir/file.go", true},
+		{"**/*.go", "dir/subdir/file.go", true},
+		{"dir/*.go", "dir/file.go", true},
+		{"dir/*.go", "otherdir/file.go", false},
+	}
+
+	for _, test := range tests {
+		result := matchGlob(test.pattern, test.path)
+		if result != test.expected {
+			t.Errorf("matchGlob(%q, %q) = %v; want %v", test.pattern, test.path, result, test.expected)
+		}
+	}
+}
+
+func TestIsCodeGenerated(t *testing.T) {
+	patterns := []string{"generated_*.go", "**/auto_*.go"}
+	tests := []struct {
+		path     string
+		expected bool
+	}{
+		{"generated_file.go", true},
+		{"normal_file.go", false},
+		{"subdir/auto_file.go", true},
+		{"subdir/normal_file.go", false},
+	}
+
+	for _, test := range tests {
+		result := isCodeGenerated(test.path, patterns)
+		if result != test.expected {
+			t.Errorf("isCodeGenerated(%q, %v) = %v; want %v", test.path, patterns, result, test.expected)
+		}
+	}
+}
+
+func TestIsIgnored(t *testing.T) {
+	patterns := []string{"*.tmp", "**/*.log"}
+	tests := []struct {
+		path     string
+		expected bool
+	}{
+		{"file.tmp", true},
+		{"file.go", false},
+		{"subdir/file.log", true},
+		{"subdir/file.txt", false},
+	}
+
+	for _, test := range tests {
+		result := isIgnored(test.path, patterns)
+		if result != test.expected {
+			t.Errorf("isIgnored(%q, %v) = %v; want %v", test.path, patterns, result, test.expected)
+		}
+	}
+}
+
+func TestRunRollup(t *testing.T) {
+	// Create a temporary directory for testing
+	tempDir, err := os.MkdirTemp("", "rollup_test")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tempDir)
+
+	// Create some test files
+	files := map[string]string{
+		"file1.go":          "package main\n\nfunc main() {}\n",
+		"file2.txt":         "This is a text file.\n",
+		"subdir/file3.go":   "package subdir\n\nfunc Func() {}\n",
+		"subdir/file4.json": "{\"key\": \"value\"}\n",
+	}
+
+	for name, content := range files {
+		path := filepath.Join(tempDir, name)
+		err := os.MkdirAll(filepath.Dir(path), 0755)
+		if err != nil {
+			t.Fatalf("Failed to create directory: %v", err)
+		}
+		err = os.WriteFile(path, []byte(content), 0644)
+		if err != nil {
+			t.Fatalf("Failed to write file: %v", err)
+		}
+	}
+
+	// Set up test configuration
+	cfg = &config.Config{
+		FileTypes: []string{"go", "txt"},
+		Ignore:    []string{"*.json"},
+	}
+	path = tempDir
+
+	// Run the rollup
+	err = runRollup()
+	if err != nil {
+		t.Fatalf("runRollup() failed: %v", err)
+	}
+
+	// Check if the output file was created
+	outputFiles, err := filepath.Glob(filepath.Join(tempDir, "*.rollup.md"))
+	if err != nil {
+		t.Fatalf("Failed to glob output files: %v", err)
+	}
+	if len(outputFiles) != 1 {
+		t.Fatalf("Expected 1 output file, got %d", len(outputFiles))
+	}
+
+	// Read the content of the output file
+	content, err := os.ReadFile(outputFiles[0])
+	if err != nil {
+		t.Fatalf("Failed to read output file: %v", err)
+	}
+
+	// Check if the content includes the expected files
+	expectedContent := []string{
+		"# File: file1.go",
+		"# File: file2.txt",
+		"# File: subdir/file3.go",
+	}
+	for _, expected := range expectedContent {
+		if !strings.Contains(string(content), expected) {
+			t.Errorf("Output file does not contain expected content: %s", expected)
+		}
+	}
+
+	// Check if the ignored file is not included
+	if strings.Contains(string(content), "file4.json") {
+		t.Errorf("Output file contains ignored file: file4.json")
+	}
+}
diff --git a/cmd/web_test.go b/cmd/web_test.go
new file mode 100644
index 0000000..e996d28
--- /dev/null
+++ b/cmd/web_test.go
@@ -0,0 +1,134 @@
+package cmd
+
+import (
+	"testing"
+	"net/url"
+	"github.com/tnypxl/rollup/internal/config"
+	"github.com/tnypxl/rollup/internal/scraper"
+)
+
+func TestConvertPathOverrides(t *testing.T) {
+	configOverrides := []config.PathOverride{
+		{
+			Path:             "/blog",
+			CSSLocator:       "article",
+			ExcludeSelectors: []string{".ads", ".comments"},
+		},
+		{
+			Path:             "/products",
+			CSSLocator:       ".product-description",
+			ExcludeSelectors: []string{".related-items"},
+		},
+	}
+
+	scraperOverrides := convertPathOverrides(configOverrides)
+
+	if len(scraperOverrides) != len(configOverrides) {
+		t.Errorf("Expected %d overrides, got %d", len(configOverrides), len(scraperOverrides))
+	}
+
+	for i, override := range scraperOverrides {
+		if override.Path != configOverrides[i].Path {
+			t.Errorf("Expected Path %s, got %s", configOverrides[i].Path, override.Path)
+		}
+		if override.CSSLocator != configOverrides[i].CSSLocator {
+			t.Errorf("Expected CSSLocator %s, got %s", configOverrides[i].CSSLocator, override.CSSLocator)
+		}
+		if len(override.ExcludeSelectors) != len(configOverrides[i].ExcludeSelectors) {
+			t.Errorf("Expected %d ExcludeSelectors, got %d", len(configOverrides[i].ExcludeSelectors), len(override.ExcludeSelectors))
+		}
+		for j, selector := range override.ExcludeSelectors {
+			if selector != configOverrides[i].ExcludeSelectors[j] {
+				t.Errorf("Expected ExcludeSelector %s, got %s", configOverrides[i].ExcludeSelectors[j], selector)
+			}
+		}
+	}
+}
+
+func TestSanitizeFilename(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		{"Hello, World!", "Hello_World"},
+		{"file/with/path", "file_with_path"},
+		{"file.with.dots", "file_with_dots"},
+		{"___leading_underscores___", "leading_underscores"},
+		{"", "untitled"},
+		{"!@#$%^&*()", "untitled"},
+	}
+
+	for _, test := range tests {
+		result := sanitizeFilename(test.input)
+		if result != test.expected {
+			t.Errorf("sanitizeFilename(%q) = %q; want %q", test.input, result, test.expected)
+		}
+	}
+}
+
+func TestGetFilenameFromContent(t *testing.T) {
+	tests := []struct {
+		content  string
+		url      string
+		expected string
+	}{
+		{"<title>Test Page</title>", "http://example.com", "Test_Page.md"},
+		{"No title here", "http://example.com/page", "http___example_com_page.md"},
+		{"<title>  Trim  Me  </title>", "http://example.com", "Trim_Me.md"},
+		{"<title></title>", "http://example.com", "http___example_com.md"},
+	}
+
+	for _, test := range tests {
+		result := getFilenameFromContent(test.content, test.url)
+		if result != test.expected {
+			t.Errorf("getFilenameFromContent(%q, %q) = %q; want %q", test.content, test.url, result, test.expected)
+		}
+	}
+}
+
+// Mock functions for testing
+func mockExtractAndConvertContent(urlStr string) (string, error) {
+	return "Mocked content for " + urlStr, nil
+}
+
+func mockExtractLinks(urlStr string) ([]string, error) {
+	return []string{"http://example.com/link1", "http://example.com/link2"}, nil
+}
+
+func TestScrapeURL(t *testing.T) {
+	// Replace the actual functions with mocks
+	oldExtractAndConvertContent := extractAndConvertContent
+	oldExtractLinks := scraper.ExtractLinks
+	defer func() {
+		extractAndConvertContent = oldExtractAndConvertContent
+		scraper.ExtractLinks = oldExtractLinks
+	}()
+	extractAndConvertContent = mockExtractAndConvertContent
+	scraper.ExtractLinks = mockExtractLinks
+
+	tests := []struct {
+		url           string
+		depth         int
+		expectedCalls int
+	}{
+		{"http://example.com", 0, 1},
+		{"http://example.com", 1, 3},
+		{"http://example.com", 2, 3}, // Same as depth 1 because our mock only returns 2 links
+	}
+
+	for _, test := range tests {
+		visited := make(map[string]bool)
+		content, err := scrapeURL(test.url, test.depth, visited)
+		if err != nil {
+			t.Errorf("scrapeURL(%q, %d) returned error: %v", test.url, test.depth, err)
+			continue
+		}
+		if len(visited) != test.expectedCalls {
+			t.Errorf("scrapeURL(%q, %d) made %d calls, expected %d", test.url, test.depth, len(visited), test.expectedCalls)
+		}
+		expectedContent := "Mocked content for " + test.url
+		if !strings.Contains(content, expectedContent) {
+			t.Errorf("scrapeURL(%q, %d) content doesn't contain %q", test.url, test.depth, expectedContent)
+		}
+	}
+}
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
new file mode 100644
index 0000000..a05c23f
--- /dev/null
+++ b/internal/config/config_test.go
@@ -0,0 +1,120 @@
+package config
+
+import (
+	"os"
+	"reflect"
+	"testing"
+)
+
+func TestLoad(t *testing.T) {
+	// Create a temporary config file
+	content := []byte(`
+file_types:
+  - go
+  - md
+ignore:
+  - "*.tmp"
+  - "**/*.log"
+code_generated:
+  - "generated_*.go"
+scrape:
+  sites:
+    - base_url: "https://example.com"
+      css_locator: "main"
+      exclude_selectors:
+        - ".ads"
+      max_depth: 2
+      allowed_paths:
+        - "/blog"
+      exclude_paths:
+        - "/admin"
+      output_alias: "example"
+      path_overrides:
+        - path: "/special"
+          css_locator: ".special-content"
+          exclude_selectors:
+            - ".sidebar"
+  output_type: "single"
+  requests_per_second: 1.0
+  burst_limit: 5
+`)
+
+	tmpfile, err := os.CreateTemp("", "config*.yml")
+	if err != nil {
+		t.Fatalf("Failed to create temp file: %v", err)
+	}
+	defer os.Remove(tmpfile.Name())
+
+	if _, err := tmpfile.Write(content); err != nil {
+		t.Fatalf("Failed to write to temp file: %v", err)
+	}
+	if err := tmpfile.Close(); err != nil {
+		t.Fatalf("Failed to close temp file: %v", err)
+	}
+
+	// Test loading the config
+	config, err := Load(tmpfile.Name())
+	if err != nil {
+		t.Fatalf("Load() failed: %v", err)
+	}
+
+	// Check if the loaded config matches the expected values
+	expectedConfig := &Config{
+		FileTypes:     []string{"go", "md"},
+		Ignore:        []string{"*.tmp", "**/*.log"},
+		CodeGenerated: []string{"generated_*.go"},
+		Scrape: ScrapeConfig{
+			Sites: []SiteConfig{
+				{
+					BaseURL:          "https://example.com",
+					CSSLocator:       "main",
+					ExcludeSelectors: []string{".ads"},
+					MaxDepth:         2,
+					AllowedPaths:     []string{"/blog"},
+					ExcludePaths:     []string{"/admin"},
+					OutputAlias:      "example",
+					PathOverrides: []PathOverride{
+						{
+							Path:             "/special",
+							CSSLocator:       ".special-content",
+							ExcludeSelectors: []string{".sidebar"},
+						},
+					},
+				},
+			},
+			OutputType:        "single",
+			RequestsPerSecond: 1.0,
+			BurstLimit:        5,
+		},
+	}
+
+	if !reflect.DeepEqual(config, expectedConfig) {
+		t.Errorf("Loaded config does not match expected config.\nGot: %+v\nWant: %+v", config, expectedConfig)
+	}
+}
+
+func TestDefaultConfigPath(t *testing.T) {
+	expected := "rollup.yml"
+	result := DefaultConfigPath()
+	if result != expected {
+		t.Errorf("DefaultConfigPath() = %q, want %q", result, expected)
+	}
+}
+
+func TestFileExists(t *testing.T) {
+	// Test with an existing file
+	tmpfile, err := os.CreateTemp("", "testfile")
+	if err != nil {
+		t.Fatalf("Failed to create temp file: %v", err)
+	}
+	defer os.Remove(tmpfile.Name())
+
+	if !FileExists(tmpfile.Name()) {
+		t.Errorf("FileExists(%q) = false, want true", tmpfile.Name())
+	}
+
+	// Test with a non-existing file
+	if FileExists("non_existing_file.txt") {
+		t.Errorf("FileExists(\"non_existing_file.txt\") = true, want false")
+	}
+}
diff --git a/internal/scraper/scraper_test.go b/internal/scraper/scraper_test.go
new file mode 100644
index 0000000..df36dec
--- /dev/null
+++ b/internal/scraper/scraper_test.go
@@ -0,0 +1,169 @@
+package scraper
+
+import (
+	"testing"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+)
+
+func TestIsAllowedURL(t *testing.T) {
+	site := SiteConfig{
+		BaseURL:      "https://example.com",
+		AllowedPaths: []string{"/blog", "/products"},
+		ExcludePaths: []string{"/admin", "/private"},
+	}
+
+	tests := []struct {
+		url      string
+		expected bool
+	}{
+		{"https://example.com/blog/post1", true},
+		{"https://example.com/products/item1", true},
+		{"https://example.com/admin/dashboard", false},
+		{"https://example.com/private/data", false},
+		{"https://example.com/other/page", false},
+		{"https://othersite.com/blog/post1", false},
+	}
+
+	for _, test := range tests {
+		result := isAllowedURL(test.url, site)
+		if result != test.expected {
+			t.Errorf("isAllowedURL(%q) = %v, want %v", test.url, result, test.expected)
+		}
+	}
+}
+
+func TestGetOverrides(t *testing.T) {
+	site := SiteConfig{
+		CSSLocator:       "main",
+		ExcludeSelectors: []string{".ads"},
+		PathOverrides: []PathOverride{
+			{
+				Path:             "/special",
+				CSSLocator:       ".special-content",
+				ExcludeSelectors: []string{".sidebar"},
+			},
+		},
+	}
+
+	tests := []struct {
+		url               string
+		expectedLocator   string
+		expectedExcludes  []string
+	}{
+		{"https://example.com/normal", "main", []string{".ads"}},
+		{"https://example.com/special", ".special-content", []string{".sidebar"}},
+		{"https://example.com/special/page", ".special-content", []string{".sidebar"}},
+	}
+
+	for _, test := range tests {
+		locator, excludes := getOverrides(test.url, site)
+		if locator != test.expectedLocator {
+			t.Errorf("getOverrides(%q) locator = %q, want %q", test.url, locator, test.expectedLocator)
+		}
+		if !reflect.DeepEqual(excludes, test.expectedExcludes) {
+			t.Errorf("getOverrides(%q) excludes = %v, want %v", test.url, excludes, test.expectedExcludes)
+		}
+	}
+}
+
+func TestExtractContentWithCSS(t *testing.T) {
+	html := `
+		<html>
+			<body>
+				<main>
+					<h1>Main Content</h1>
+					<p>This is the main content.</p>
+					<div class="ads">Advertisement</div>
+				</main>
+				<aside>Sidebar content</aside>
+			</body>
+		</html>
+	`
+
+	tests := []struct {
+		includeSelector  string
+		excludeSelectors []string
+		expected         string
+	}{
+		{"main", nil, "<h1>Main Content</h1>\n<p>This is the main content.</p>\n<div class=\"ads\">Advertisement</div>"},
+		{"main", []string{".ads"}, "<h1>Main Content</h1>\n<p>This is the main content.</p>"},
+		{"aside", nil, "Sidebar content"},
+	}
+
+	for _, test := range tests {
+		result, err := ExtractContentWithCSS(html, test.includeSelector, test.excludeSelectors)
+		if err != nil {
+			t.Errorf("ExtractContentWithCSS() returned error: %v", err)
+			continue
+		}
+		if strings.TrimSpace(result) != strings.TrimSpace(test.expected) {
+			t.Errorf("ExtractContentWithCSS() = %q, want %q", result, test.expected)
+		}
+	}
+}
+
+func TestProcessHTMLContent(t *testing.T) {
+	html := `
+		<html>
+			<body>
+				<h1>Test Heading</h1>
+				<p>This is a <strong>test</strong> paragraph.</p>
+				<ul>
+					<li>Item 1</li>
+					<li>Item 2</li>
+				</ul>
+			</body>
+		</html>
+	`
+
+	expected := strings.TrimSpace(`
+# Test Heading
+
+This is a **test** paragraph.
+
+- Item 1
+- Item 2
+	`)
+
+	result, err := ProcessHTMLContent(html, Config{})
+	if err != nil {
+		t.Fatalf("ProcessHTMLContent() returned error: %v", err)
+	}
+
+	if strings.TrimSpace(result) != expected {
+		t.Errorf("ProcessHTMLContent() = %q, want %q", result, expected)
+	}
+}
+
+func TestExtractLinks(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/html")
+		w.Write([]byte(`
+			<html>
+				<body>
+					<a href="https://example.com/page1">Page 1</a>
+					<a href="https://example.com/page2">Page 2</a>
+					<a href="https://othersite.com">Other Site</a>
+				</body>
+			</html>
+		`))
+	}))
+	defer server.Close()
+
+	links, err := ExtractLinks(server.URL)
+	if err != nil {
+		t.Fatalf("ExtractLinks() returned error: %v", err)
+	}
+
+	expectedLinks := []string{
+		"https://example.com/page1",
+		"https://example.com/page2",
+		"https://othersite.com",
+	}
+
+	if !reflect.DeepEqual(links, expectedLinks) {
+		t.Errorf("ExtractLinks() = %v, want %v", links, expectedLinks)
+	}
+}