Add tests to validate ID management

Author: pglombardo

tests/__init__.py

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+import sys
+sys.path.append("/Users/pglombardo/Projects/instana/python-sensor")

tests/test_id_management.py

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+import instana.util
+import string
+from nose.tools import assert_equals
+
+
+def test_id_generation():
+    count = 0
+    while count <= 1000:
+        id = instana.util.generate_id()
+        assert id >= -9223372036854775808
+        assert id <= 9223372036854775807
+        count += 1
+
+
+def test_id_max_value_and_conversion():
+    max_id = 9223372036854775807
+    min_id = -9223372036854775808
+    max_hex = "7fffffffffffffff"
+    min_hex = "8000000000000000"
+
+    assert_equals(max_hex, instana.util.id_to_header(max_id))
+    assert_equals(min_hex, instana.util.id_to_header(min_id))
+
+    assert_equals(max_id, instana.util.header_to_id(max_hex))
+    assert_equals(min_id, instana.util.header_to_id(min_hex))
+
+
+def test_id_conversion_back_and_forth():
+    # id --> header --> id
+    original_id = instana.util.generate_id()
+    header_id = instana.util.id_to_header(original_id)
+    converted_back_id = instana.util.header_to_id(header_id)
+    assert original_id == converted_back_id
+
+    # header --> id --> header
+    original_header_id = "c025ee93b1aeda7b"
+    id = instana.util.header_to_id(original_header_id)
+    converted_back_header_id = instana.util.id_to_header(id)
+    assert_equals(original_header_id, converted_back_header_id)
+
+    # Test a random value
+    id = -7815363404733516491
+    header = "938a406416457535"
+
+    result = instana.util.header_to_id(header)
+    assert_equals(id, result)
+
+    result = instana.util.id_to_header(id)
+    assert_equals(header, result)
+
+
+def test_that_leading_zeros_handled_correctly():
+    header = instana.util.id_to_header(16)
+    assert_equals("10", header)
+
+    id = instana.util.header_to_id("10")
+    assert_equals(16, id)
+
+    id = instana.util.header_to_id("0000000000000010")
+    assert_equals(16, id)
+
+    id = instana.util.header_to_id("88b6c735206ca42")
+    assert_equals(615705016619420226, id)
+
+    id = instana.util.header_to_id("088b6c735206ca42")
+    assert_equals(615705016619420226, id)
+
+
+def test_id_to_header_conversion():
+    # Test passing a standard Integer ID
+    original_id = instana.util.generate_id()
+    converted_id = instana.util.id_to_header(original_id)
+
+    # Assert that it is a string and there are no non-hex characters
+    assert isinstance(converted_id, basestring)
+    assert all(c in string.hexdigits for c in converted_id)
+
+    # Test passing a standard Integer ID as a String
+    original_id = instana.util.generate_id()
+    converted_id = instana.util.id_to_header(original_id)
+
+    # Assert that it is a string and there are no non-hex characters
+    assert isinstance(converted_id, basestring)
+    assert all(c in string.hexdigits for c in converted_id)
+
+
+def test_id_to_header_conversion_with_bogus_id():
+    # Test passing an empty String
+    converted_id = instana.util.id_to_header('')
+
+    # Assert that it is a string and there are no non-hex characters
+    assert isinstance(converted_id, basestring)
+    assert converted_id == ''
+
+    # Test passing a nil
+    converted_id = instana.util.id_to_header(None)
+
+    # Assert that it is a string and there are no non-hex characters
+    assert isinstance(converted_id, basestring)
+    assert converted_id == ''
+
+    # Test passing an Array
+    converted_id = instana.util.id_to_header([])
+
+    # Assert that it is a string and there are no non-hex characters
+    assert isinstance(converted_id, basestring)
+    assert converted_id == ''
+
+
+def test_header_to_id_conversion():
+    # Get a hex string to test against & convert
+    header_id = instana.util.id_to_header(instana.util.generate_id)
+    converted_id = instana.util.header_to_id(header_id)
+
+    # Assert that it is an Integer
+    assert isinstance(converted_id, int)
+
+
+def test_header_to_id_conversion_with_bogus_header():
+    # Bogus nil arg
+    bogus_result = instana.util.header_to_id(None)
+    assert_equals(0, bogus_result)
+
+    # Bogus Integer arg
+    bogus_result = instana.util.header_to_id(1234)
+    assert_equals(0, bogus_result)
+
+    # Bogus Array arg
+    bogus_result = instana.util.header_to_id([1234])
+    assert_equals(0, bogus_result)