[WIP] Add a very basic test suite

dev-requirements.txt

@@ -0,0 +1,3 @@
+pytest
+virtualenv
+scripttest

tests/test_install.py

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+import os
+import sys
+import scripttest
+
+# Locate get-pip.py relative to this test file
+GET_PIP = os.path.join(os.path.dirname(os.path.dirname(__file__)),
+                       'get-pip.py')
+
+# Handle platform specific differences
+if sys.platform.startswith('win'):
+    BIN_DIR = 'Scripts'
+    def exe_base(path):
+        """Command name of an executable"""
+        return os.path.splitext(os.path.basename(path))[0]
+else:
+    BIN_DIR = 'bin'
+    def exe_base(path):
+        """Command name of an executable"""
+        return os.path.basename(path)
+
+
+def test_install(tmpdir):
+    """Simple test that installing pip using get-pip works"""
+
+    # Create a scripttest environment
+    env = scripttest.TestFileEnvironment(tmpdir / 'env')
+
+    # Create a virtual environment with no pip present.
+    # TODO: add the following cases
+    #   1. environment name with spaces
+    #   2. environment with some version of pip already present
+
+    ve_name = 've'
+    env.run('virtualenv', '--no-pip', '--no-setuptools', '--no-wheel',
+            ve_name)
+    ve_python = os.path.join(ve_name, BIN_DIR, 'python')
+
+    # Run get-pip.py from this repository
+    result = env.run(ve_python, GET_PIP)
+
+    # Check if the pip command was created
+    created_pip = None
+    for name, file_obj in result.files_created.items():
+        if exe_base(name) == 'pip' and file_obj.file:
+            created_pip = file_obj
+            break
+    assert created_pip
+
+    # Confirm that both the pip exe and python -m pip work
+    env.run(created_pip.full, '--version')
+    env.run(ve_python, '-m', 'pip', '--version')