Adds initial test framework; adds PrivateKey.from_nsec() (#13)

* Adds initial test framework; adds PrivateKey.from_nsec()

* Update setup.py

test/README.md

@@ -0,0 +1,31 @@
+# Testing python-nostr
+
+## Set up the test environment
+
+Install the test-runner dependencies:
+```
+pip3 install -r test/requirements.txt
+```
+
+Then make the `nostr` python module visible/importable to the tests by installing the local dev dir as an editable module:
+```
+# from the repo root
+pip3 install -e .
+```
+
+## Running the test suite
+Run the whole test suite:
+```
+# from the repo root
+pytest
+```
+
+Run a specific test file:
+```
+pytest test/test_this_file.py
+```
+
+Run a specific test:
+```
+pytest test/test_this_file.py::test_this_specific_test
+```

test/requirements.txt

@@ -0,0 +1 @@
+pytest>=7.2.0

test/test_key.py

@@ -0,0 +1,23 @@
+from nostr.key import PrivateKey
+
+
+def test_eq_true():
+    """ __eq__ should return True when PrivateKeys are equal """
+    pk1 = PrivateKey()
+    pk2 = PrivateKey(pk1.raw_secret)
+    assert pk1 == pk2
+
+
+def test_eq_false():
+    """ __eq__ should return False when PrivateKeys are not equal """
+    pk1 = PrivateKey()
+    pk2 = PrivateKey()
+    assert pk1.raw_secret != pk2.raw_secret
+    assert pk1 != pk2
+
+
+def test_from_nsec():
+    """ PrivateKey.from_nsec should yield the source's raw_secret """
+    pk1 = PrivateKey()
+    pk2 = PrivateKey.from_nsec(pk1.bech32())
+    assert pk1.raw_secret == pk2.raw_secret