diff --git a/src/synthale/cli.py b/src/synthale/cli.py
index abca9f6..4b41418 100644
--- a/src/synthale/cli.py
+++ b/src/synthale/cli.py
@@ -2,14 +2,23 @@
 
 import click
 
+from synthale.recipes import load_file, load_all_files, write_recipes
+
 
 @click.command()
-@click.argument('input')
-@click.argument('output')
-def main(input, output):
+@click.argument('input_path')
+@click.argument('output_path')
+def main(input_path, output_path):
     """Generate markdown files from BeerXML files.
 
-    INPUT is either a directory containing XML files, or an individual XML
-    file. OUTPUT is the directory to write the markdown files to.
+    INPUT_PATH is either a directory containing XML files, or an individual XML
+    file. OUTPUT_PATH is the directory to write the markdown files to.
     """
-    pass
+    click.echo("Generating markdown from '{}'...".format(input_path))
+
+    if input_path.endswith('.xml'):
+        recipes = load_file(input_path)
+    else:
+        recipes = load_all_files(input_path)
+
+    write_recipes(recipes, output_path)
diff --git a/src/synthale/recipes.py b/src/synthale/recipes.py
index 250b4ed..2b46916 100644
--- a/src/synthale/recipes.py
+++ b/src/synthale/recipes.py
@@ -70,3 +70,14 @@ def load_all_files(path):
             recipes.extend(load_file(os.path.join(path, name)))
 
     return recipes
+
+
+def write_recipes(recipes, output_path):
+    """Write `recipes` to `output_path`.
+
+    `recipes` is a list of MarkdownRecipe objects. `output_path` is a directory
+    to write the recipes to.
+    """
+    for recipe in recipes:
+        with open(os.path.join(output_path, recipe.filename), 'w') as f:
+            f.write(recipe.markdown)
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..41d96d7
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,22 @@
+"""Contains fixtures used during tests."""
+
+import pytest
+import pybeerxml
+
+from synthale.recipes import MarkdownRecipe
+
+
+@pytest.fixture
+def xml_recipes():
+    """Generate a list of pybeerxml.Recipe objects."""
+    coffeestout = pybeerxml.Parser().parse('tests/recipes/coffee-stout.xml')[0]
+    weizen = pybeerxml.Parser().parse('tests/recipes/weizen.xml')[0]
+    return [coffeestout, weizen]
+
+
+@pytest.fixture
+def md_recipes():
+    """Generate a list of MarkdownRecipe objects."""
+    coffeestout = pybeerxml.Parser().parse('tests/recipes/coffee-stout.xml')[0]
+    weizen = pybeerxml.Parser().parse('tests/recipes/weizen.xml')[0]
+    return [MarkdownRecipe(coffeestout), MarkdownRecipe(weizen)]
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..e37c39b
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,42 @@
+"""Test interactions with the CLI."""
+
+from click.testing import CliRunner
+
+from synthale.cli import main
+
+
+def test_main_help():
+    """Test the help output of the main CLI command."""
+    runner = CliRunner()
+    result = runner.invoke(main, ['--help'])
+    assert 'INPUT_PATH' in result.output
+    assert 'OUTPUT_PATH' in result.output
+
+
+def test_main_directory(tmpdir, md_recipes):
+    """Test command where input is a directory."""
+    runner = CliRunner()
+    result = runner.invoke(main, ['tests/recipes', str(tmpdir)])
+
+    assert result.exit_code == 0
+    assert result.output.startswith(
+        "Generating markdown from 'tests/recipes'..."
+    )
+
+    for recipe in md_recipes:
+        path = tmpdir.join(recipe.filename)
+        assert path.read() == recipe.markdown
+
+
+def test_main_file(tmpdir):
+    """Test command where input is a file."""
+    runner = CliRunner()
+    result = runner.invoke(main, ['tests/recipes/weizen.xml', str(tmpdir)])
+
+    assert result.exit_code == 0
+    assert result.output.startswith(
+        "Generating markdown from 'tests/recipes/weizen.xml'..."
+    )
+
+    path = tmpdir.join('weizen.md')
+    assert path.read().startswith('Weizen')
diff --git a/tests/test_recipes.py b/tests/test_recipes.py
index 689a1b0..1890072 100644
--- a/tests/test_recipes.py
+++ b/tests/test_recipes.py
@@ -2,7 +2,9 @@
 
 import pybeerxml
 
-from synthale.recipes import MarkdownRecipe, load_file, load_all_files
+from synthale.recipes import (
+    MarkdownRecipe, load_file, load_all_files, write_recipes
+)
 
 
 def test_load_file(capsys):
@@ -40,3 +42,12 @@ def test_markdown_recipe_markdown():
     xml_recipe.name = 'Foobar'
     recipe = MarkdownRecipe(xml_recipe)
     assert recipe.markdown == 'Foobar\n======'
+
+
+def test_write_recipes(md_recipes, tmpdir):
+    """Test write_recipes function."""
+    write_recipes(md_recipes, str(tmpdir))
+
+    for recipe in md_recipes:
+        path = tmpdir.join(recipe.filename)
+        assert path.read() == recipe.markdown