Test 1: Operations on an empty book
Total size of book = 0
Size of area code ( 909 ) = 0
Number of phone numbers with area code ( 909 ) and prefix 234 = 0
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Test 2: Inserting first phone number
( 909 )
       345-1111, 
Total size of book = 1
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Test 3: Inserting 3 additional phone numbers to the same area code
( 909 )
       123-1111, 345-3333, 345-2222, 345-1111, 
Total size of book = 4
Size of area code ( 909 ) = 4
Number of phone numbers with area code ( 909 ) and prefix 345 = 3
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Test 4: Inserting duplicate number at tail of phone number list
( 909 )
       123-1111, 345-3333, 345-2222, 345-1111, 
Total size of book = 4
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Test 5: Inserting duplicate number in middle of phone number list
( 909 )
       123-1111, 345-3333, 345-2222, 345-1111, 
Total size of book = 4
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Test 6: Inserting duplicate number at head of phone number list
( 909 )
       123-1111, 345-3333, 345-2222, 345-1111, 
Total size of book = 4
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Test 7: Inserting 4 more numbers to the same area code
( 909 )
       123-5555, 123-4444, 123-3333, 123-2222, 123-1111, 
       345-3333, 345-2222, 345-1111, 
Total size of book = 8
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Test 8: Searching for a phone number that does exist
Searching for 909-345-1111....found
Total size of book = 8
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Test 9: Searching for a phone number that does not exist
Searching for 909-345-9876....not found
Total size of book = 8
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