diff --git a/tests/pipdeptree_tests.py b/tests/pipdeptree_tests.py
new file mode 100644
index 0000000..4e4f5db
--- /dev/null
+++ b/tests/pipdeptree_tests.py
@@ -0,0 +1,57 @@
+import pickle
+
+from pipdeptree import req_version, non_top_pkg_name, render_tree
+
+
+with open('tests/pkgs.p') as f:
+    pkgs = pickle.load(f)
+
+
+pkg_index = {p.key: p for p in pkgs}
+
+
+def find_req(req, parent):
+    """Helper to get the requirement object from it's parent package
+
+    :param req    : string
+    :param parent : pkg_resources.Distribution instance
+    :rtype        : instance of requirement frozen set
+
+    """
+    return [r for r in pkg_index[parent].requires() if r.key == req][0]
+
+
+def test_req_version():
+    sqlalchemy = find_req('sqlalchemy', 'alembic')
+    assert req_version(sqlalchemy) == '>=0.7.3'
+    mako = find_req('mako', 'alembic')
+    assert req_version(mako) is None
+
+
+def test_non_top_pkg_name():
+    flask_p = pkg_index['flask']
+    flask_r = find_req('flask', 'flask-script')
+    assert non_top_pkg_name(flask_r, flask_p) == 'flask [installed: 0.10.1]'
+
+    markupsafe_p = pkg_index['markupsafe']
+    markupsafe_jinja2_r = find_req('markupsafe', 'jinja2')
+    assert non_top_pkg_name(markupsafe_jinja2_r, markupsafe_p) == 'markupsafe [installed: 0.18]'
+
+    markupsafe_mako_r = find_req('markupsafe', 'mako')
+    assert non_top_pkg_name(markupsafe_mako_r, markupsafe_p) == 'markupsafe [required: >=0.9.2, installed: 0.18]'
+
+
+def test_render_tree_only_top():
+    tree_str = render_tree(pkgs, False)
+    lines = set(tree_str.split('\n'))
+    assert 'flask-script==0.6.6' in lines
+    assert '  - sqlalchemy [required: >=0.7.3, installed: 0.9.1]' in lines
+    assert 'itsdangerous==0.23' not in lines
+
+
+def test_render_tree_list_all():
+    tree_str = render_tree(pkgs, True)
+    lines = set(tree_str.split('\n'))
+    assert 'flask-script==0.6.6' in lines
+    assert '  - sqlalchemy [required: >=0.7.3, installed: 0.9.1]' in lines
+    assert 'itsdangerous==0.23' in lines
diff --git a/tests/pkgs.p b/tests/pkgs.p
new file mode 100644
index 0000000..084dbd5
--- /dev/null
+++ b/tests/pkgs.p
@@ -0,0 +1,415 @@
+(lp0
+ccopy_reg
+_reconstructor
+p1
+(cpkg_resources
+Distribution
+p2
+c__builtin__
+object
+p3
+Ntp4
+Rp5
+(dp6
+S'project_name'
+p7
+S'psycopg2'
+p8
+sS'precedence'
+p9
+I-1
+sS'_key'
+p10
+S'psycopg2'
+p11
+sS'_version'
+p12
+S'2.5.2'
+p13
+sS'platform'
+p14
+NsS'location'
+p15
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages'
+p16
+sS'py_version'
+p17
+S'2.7'
+p18
+sS'_provider'
+p19
+(ipkg_resources
+PathMetadata
+p20
+(dp21
+S'module_path'
+p22
+g16
+sS'egg_info'
+p23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/psycopg2-2.5.2-py2.7.egg-info'
+p24
+sbsbag1
+(g2
+g3
+Ntp25
+Rp26
+(dp27
+g7
+S'Werkzeug'
+p28
+sg9
+I-1
+sg10
+S'werkzeug'
+p29
+sg12
+S'0.9.4'
+p30
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p31
+sg19
+(ipkg_resources
+PathMetadata
+p32
+(dp33
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/Werkzeug-0.9.4-py2.7.egg-info'
+p34
+sbsbag1
+(g2
+g3
+Ntp35
+Rp36
+(dp37
+g7
+S'Flask'
+p38
+sg9
+I-1
+sg10
+S'flask'
+p39
+sg12
+S'0.10.1'
+p40
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p41
+sg19
+(ipkg_resources
+PathMetadata
+p42
+(dp43
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/Flask-0.10.1-py2.7.egg-info'
+p44
+sbsbag1
+(g2
+g3
+Ntp45
+Rp46
+(dp47
+g7
+S'Mako'
+p48
+sg9
+I-1
+sg10
+S'mako'
+p49
+sg12
+S'0.9.1'
+p50
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p51
+sg19
+(ipkg_resources
+PathMetadata
+p52
+(dp53
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/Mako-0.9.1-py2.7.egg-info'
+p54
+sbsbag1
+(g2
+g3
+Ntp55
+Rp56
+(dp57
+g7
+S'MarkupSafe'
+p58
+sg9
+I-1
+sg10
+S'markupsafe'
+p59
+sg12
+S'0.18'
+p60
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p61
+sg19
+(ipkg_resources
+PathMetadata
+p62
+(dp63
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/MarkupSafe-0.18-py2.7.egg-info'
+p64
+sbsbag1
+(g2
+g3
+Ntp65
+Rp66
+(dp67
+g7
+S'Flask-Script'
+p68
+sg9
+I-1
+sg10
+S'flask-script'
+p69
+sg12
+S'0.6.6'
+p70
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p71
+sg19
+(ipkg_resources
+PathMetadata
+p72
+(dp73
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/Flask_Script-0.6.6-py2.7.egg-info'
+p74
+sbsbag1
+(g2
+g3
+Ntp75
+Rp76
+(dp77
+g7
+S'alembic'
+p78
+sg9
+I-1
+sg10
+S'alembic'
+p79
+sg12
+S'0.6.2'
+p80
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p81
+sg19
+(ipkg_resources
+PathMetadata
+p82
+(dp83
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/alembic-0.6.2-py2.7.egg-info'
+p84
+sbsbag1
+(g2
+g3
+Ntp85
+Rp86
+(dp87
+g7
+S'itsdangerous'
+p88
+sg9
+I-1
+sg10
+S'itsdangerous'
+p89
+sg12
+S'0.23'
+p90
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p91
+sg19
+(ipkg_resources
+PathMetadata
+p92
+(dp93
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/itsdangerous-0.23-py2.7.egg-info'
+p94
+sbsbag1
+(g2
+g3
+Ntp95
+Rp96
+(dp97
+g7
+S'SQLAlchemy'
+p98
+sg9
+I-1
+sg10
+S'sqlalchemy'
+p99
+sg12
+S'0.9.1'
+p100
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p101
+sg19
+(ipkg_resources
+PathMetadata
+p102
+(dp103
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/SQLAlchemy-0.9.1-py2.7.egg-info'
+p104
+sbsbag1
+(g2
+g3
+Ntp105
+Rp106
+(dp107
+g7
+S'slugify'
+p108
+sg9
+I-1
+sg10
+S'slugify'
+p109
+sg12
+S'0.0.1'
+p110
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p111
+sg19
+(ipkg_resources
+PathMetadata
+p112
+(dp113
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/slugify-0.0.1-py2.7.egg-info'
+p114
+sbsbag1
+(g2
+g3
+Ntp115
+Rp116
+(dp117
+g7
+S'Jinja2'
+p118
+sg9
+I-1
+sg10
+S'jinja2'
+p119
+sg12
+S'2.7.2'
+p120
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p121
+sg19
+(ipkg_resources
+PathMetadata
+p122
+(dp123
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/Jinja2-2.7.2-py2.7.egg-info'
+p124
+sbsbag1
+(g2
+g3
+Ntp125
+Rp126
+(dp127
+g7
+S'redis'
+p128
+sg9
+I-1
+sg10
+S'redis'
+p129
+sg12
+S'2.9.1'
+p130
+sg14
+Nsg15
+g16
+sg17
+S'2.7'
+p131
+sg19
+(ipkg_resources
+PathMetadata
+p132
+(dp133
+g22
+g16
+sg23
+S'/home/vineet/.virtualenvs/equimapper/lib/python2.7/site-packages/redis-2.9.1-py2.7.egg-info'
+p134
+sbsba.
\ No newline at end of file