diff --git a/.changeset/khaki-ravens-fail.md b/.changeset/khaki-ravens-fail.md
new file mode 100644
index 00000000..fc617139
--- /dev/null
+++ b/.changeset/khaki-ravens-fail.md
@@ -0,0 +1,5 @@
+---
+'@inox-tools/astro-tests': minor
+---
+
+Allow file edits and resets to create and delete files in the source code
diff --git a/docs/src/content/docs/astro-tests.mdx b/docs/src/content/docs/astro-tests.mdx
index 7525a769..01bbfa17 100644
--- a/docs/src/content/docs/astro-tests.mdx
+++ b/docs/src/content/docs/astro-tests.mdx
@@ -208,22 +208,32 @@ Checks whether the given path exists on the build output (`outDir` config).
 ### `readFile`
 
 <p>
-  **Type:** `(path: string) => Promise<string>`
+  **Type:** `(path: string) => Promise<string | null>`
 </p>
 
-Read a file from the build (relative to `outDir` config).
+Read a file from the build (relative to the `outDir` config). Returns null if the file doesn't exist.
+
+### `readSrcFile`
+
+<p>
+  **Type:** `(path: string) => Promise<string | null>`
+</p>
+
+Read a file from the project (relative to the `root` config). Returns null if the file doesn't exist.
 
 ### `editFile`
 
 <p>
-  **Type:** `(path: string, updater: string | ((content: string) => string)) => Promise<() => void>`
+  **Type:** `(path: string, updater: string | null | ((content: string | null) => string | null)) => Promise<() => void>`
 </p>
 
 Edit a file in the fixture directory.
 
 The first parameter is a path relative to the root of the fixture.
 
-The second parameter can be the new content of the file or a function that takes the current content and returns the new content.
+The second parameter can be the new content of the file or a function that takes the current content and returns the new content. The content passed to the function will be null if the file doesn't exist.
+
+If the given content or content returned from the given function is null, the file will be deleted.
 
 This function returns a Promise that resolves to another function. This resolved function can be called to revert the changes.
 
diff --git a/packages/astro-tests/src/astroFixture.ts b/packages/astro-tests/src/astroFixture.ts
index aab65fbb..7298415f 100644
--- a/packages/astro-tests/src/astroFixture.ts
+++ b/packages/astro-tests/src/astroFixture.ts
@@ -93,17 +93,31 @@ type Fixture = {
 	pathExists: (path: string) => boolean;
 	/**
 	 * Read a file from the build.
+	 *
+	 * Returns null if the file doesn't exist.
+	 */
+	readFile: (path: string) => Promise<string | null>;
+	/**
+	 * Read a file from the project.
+	 *
+	 * Returns null if the file doesn't exist.
 	 */
-	readFile: (path: string) => Promise<string>;
+	readSrcFile: (path: string) => Promise<string | null>;
 	/**
 	 * Edit a file in the fixture.
 	 *
 	 * The second parameter can be the new content of the file
 	 * or a function that takes the current content and returns the new content.
 	 *
+	 * The content passed to the function will be null if the file doesn't exist.
+	 * If the returned content is null, the file will be deleted.
+	 *
 	 * Returns a function that can be called to revert the edit.
 	 */
-	editFile: (path: string, updater: string | ((content: string) => string)) => Promise<() => void>;
+	editFile: (
+		path: string,
+		updater: string | null | ((content: string | null) => string | null)
+	) => Promise<() => void>;
 	/**
 	 * Reset all changes made with .editFile()
 	 */
@@ -224,14 +238,17 @@ export async function loadFixture(inlineConfig: InlineConfig): Promise<Fixture>
 	const onNextChange = () =>
 		devServer
 			? new Promise<void>((resolve) =>
-					// TODO: Implement filter to only resolve on changes to a given file.
-					devServer.watcher.once('change', () => resolve())
-				)
+				// TODO: Implement filter to only resolve on changes to a given file.
+				devServer.watcher.once('change', () => resolve())
+			)
 			: Promise.reject(new Error('No dev server running'));
 
 	// Also do it on process exit, just in case.
 	process.on('exit', resetAllFiles);
 
+	const resolveOutPath = (path: string) => new URL(path.replace(/^\//, ''), config.outDir);
+	const resolveProjectPath = (path: string) => new URL(path.replace(/^\//, ''), config.root);
+
 	return {
 		config,
 		startDevServer: async (extraInlineConfig = {}) => {
@@ -274,7 +291,7 @@ export async function loadFixture(inlineConfig: InlineConfig): Promise<Fixture>
 			});
 
 			debug(`Removing node_modules/.astro`);
-			await fs.promises.rm(new URL('./node_modules/.astro', config.root), {
+			await fs.promises.rm(resolveProjectPath('./node_modules/.astro'), {
 				maxRetries: 10,
 				recursive: true,
 				force: true,
@@ -288,7 +305,7 @@ export async function loadFixture(inlineConfig: InlineConfig): Promise<Fixture>
 			});
 
 			debug(`Removing .astro`);
-			await fs.promises.rm(new URL('./.astro', config.root), {
+			await fs.promises.rm(resolveProjectPath('./.astro'), {
 				maxRetries: 10,
 				recursive: true,
 				force: true,
@@ -340,16 +357,39 @@ export async function loadFixture(inlineConfig: InlineConfig): Promise<Fixture>
 			}
 		},
 
-		pathExists: (p) => fs.existsSync(new URL(p.replace(/^\//, ''), config.outDir)),
-		readFile: (filePath) =>
-			fs.promises.readFile(new URL(filePath.replace(/^\//, ''), config.outDir), 'utf8'),
+		pathExists: (p) => fs.existsSync(resolveOutPath(p)),
+		readFile: async (filePath) => {
+			const path = resolveOutPath(filePath);
+
+			if (!fs.existsSync(path)) {
+				return null;
+			}
+
+			return fs.promises.readFile(path, 'utf8');
+		},
+		readSrcFile: async (filePath) => {
+			const path = resolveProjectPath(filePath);
+
+			if (!fs.existsSync(path)) {
+				return null;
+			}
+
+			return fs.promises.readFile(path, 'utf8');
+		},
 		editFile: async (filePath, newContentsOrCallback) => {
-			const fileUrl = new URL(filePath.replace(/^\//, ''), config.root);
-			const contents = await fs.promises.readFile(fileUrl, 'utf-8');
+			const fileUrl = resolveProjectPath(filePath);
+
+			const contents = fs.existsSync(fileUrl) ? await fs.promises.readFile(fileUrl, 'utf-8') : null;
+
 			const reset = () => {
 				debug(`Resetting ${filePath}`);
-				fs.writeFileSync(fileUrl, contents);
+				if (contents) {
+					fs.writeFileSync(fileUrl, contents);
+				} else {
+					fs.rmSync(fileUrl, { force: true });
+				}
 			};
+
 			// Only save this reset if not already in the map, in case multiple edits happen
 			// to the same file.
 			if (!fileEdits.has(fileUrl.toString())) {
@@ -357,12 +397,21 @@ export async function loadFixture(inlineConfig: InlineConfig): Promise<Fixture>
 			}
 
 			debug(`Editing ${filePath}`);
+
 			const newContents =
 				typeof newContentsOrCallback === 'function'
 					? newContentsOrCallback(contents)
 					: newContentsOrCallback;
+
 			const nextChange = devServer ? onNextChange() : Promise.resolve();
-			await fs.promises.writeFile(fileUrl, newContents);
+
+			if (newContents) {
+				await fs.promises.mkdir(path.dirname(fileURLToPath(fileUrl)), { recursive: true });
+				await fs.promises.writeFile(fileUrl, newContents);
+			} else {
+				await fs.promises.rm(fileUrl, { force: true });
+			}
+
 			await nextChange;
 			return reset;
 		},