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    A unit testing framework.
    The core of the library is the "is" macro, which lets you make
    assertions of any arbitrary expression:
    (is (= 4 (+ 2 2)))
    (is (instance? Integer 256))
    (is (.startsWith "abcde" "ab"))
    You can type an "is" expression directly at the REPL, which will
    print a message if it fails.
        user> (is (= 5 (+ 2 2)))
        FAIL in  (:1)
        expected: (= 5 (+ 2 2))
          actual: (not (= 5 4))
    The "expected:" line shows you the original expression, and the
    "actual:" shows you what actually happened.  In this case, it
    shows that (+ 2 2) returned 4, which is not = to 5.  Finally, the
    "false" on the last line is the value returned from the
    expression.  The "is" macro always returns the result of the
    inner expression.
    There are two special assertions for testing exceptions.  The
    "(is (thrown? c ...))" form tests if an exception of class c is
    (is (thrown? ArithmeticException (/ 1 0))) 
    "(is (thrown-with-msg? c re ...))" does the same thing and also
    tests that the message on the exception matches the regular
    expression re:
    (is (thrown-with-msg? ArithmeticException #"Divide by zero"
                          (/ 1 0)))
    "is" takes an optional second argument, a string describing the
    assertion.  This message will be included in the error report.
    (is (= 5 (+ 2 2)) "Crazy arithmetic")
    In addition, you can document groups of assertions with the
    "testing" macro, which takes a string followed by any number of
    assertions.  The string will be included in failure reports.
    Calls to "testing" may be nested, and all of the strings will be
    joined together with spaces in the final report, in a style
    similar to RSpec <>
    (testing "Arithmetic"
      (testing "with positive integers"
        (is (= 4 (+ 2 2)))
        (is (= 7 (+ 3 4))))
      (testing "with negative integers"
        (is (= -4 (+ -2 -2)))
        (is (= -1 (+ 3 -4)))))
    Note that, unlike RSpec, the "testing" macro may only be used
    INSIDE a "deftest" or "with-test" form (see below).
    There are two ways to define tests.  The "with-test" macro takes
    a defn or def form as its first argument, followed by any number
    of assertions.  The tests will be stored as metadata on the
        (defn my-function [x y]
          (+ x y))
      (is (= 4 (my-function 2 2)))
      (is (= 7 (my-function 3 4))))
    As of Clojure SVN rev. 1221, this does not work with defmacro.
    The other way lets you define tests separately from the rest of
    your code, even in a different namespace:
    (deftest addition
      (is (= 4 (+ 2 2)))
      (is (= 7 (+ 3 4))))
    (deftest subtraction
      (is (= 1 (- 4 3)))
      (is (= 3 (- 7 4))))
    This creates functions named "addition" and "subtraction", which
    can be called like any other function.  Therefore, tests can be
    grouped and composed, in a style similar to the test framework in
    Peter Seibel's "Practical Common Lisp"
    (deftest arithmetic
    The names of the nested tests will be joined in a list, like
    "(arithmetic addition)", in failure reports.  You can use nested
    tests to set up a context shared by several tests.
    Run tests with the function "(run-tests namespaces...)":
    (run-tests 'your.namespace 'some.other.namespace)
    If you don't specify any namespaces, the current namespace is
    used.  To run all tests in all namespaces, use "(run-all-tests)".
    By default, these functions will search for all tests defined in
    a namespace and run them in an undefined order.  However, if you
    are composing tests, as in the "arithmetic" example above, you
    probably do not want the "addition" and "subtraction" tests run
    separately.  In that case, you must define a special function
    named "test-ns-hook" that runs your tests in the correct order:
    (defn test-ns-hook []
    Note: test-ns-hook prevents execution of fixtures (see below).
    You can bind the variable "*load-tests*" to false when loading or
    compiling code in production.  This will prevent any tests from
    being created by "with-test" or "deftest".
    Fixtures allow you to run code before and after tests, to set up
    the context in which tests should be run.
    A fixture is just a function that calls another function passed as
    an argument.  It looks like this:
    (defn my-fixture [f]
       Perform setup, establish bindings, whatever.
      (f)  Then call the function we were passed.
       Tear-down / clean-up code here.
    Fixtures are attached to namespaces in one of two ways.  "each"
    fixtures are run repeatedly, once for each test function created
    with "deftest" or "with-test".  "each" fixtures are useful for
    establishing a consistent before/after state for each test, like
    clearing out database tables.
    "each" fixtures can be attached to the current namespace like this:
    (use-fixtures :each fixture1 fixture2 ...)
    The fixture1, fixture2 are just functions like the example above.
    They can also be anonymous functions, like this:
    (use-fixtures :each (fn [f] setup... (f) cleanup...))
    The other kind of fixture, a "once" fixture, is only run once,
    around ALL the tests in the namespace.  "once" fixtures are useful
    for tasks that only need to be performed once, like establishing
    database connections, or for time-consuming tasks.
    Attach "once" fixtures to the current namespace like this:
    (use-fixtures :once fixture1 fixture2 ...)
    Note: Fixtures and test-ns-hook are mutually incompatible.  If you
    are using test-ns-hook, fixture functions will *never* be run.
    All the test reporting functions write to the var *test-out*.  By
    default, this is the same as *out*, but you can rebind it to any
    PrintWriter.  For example, it could be a file opened with
    You can extend the behavior of the "is" macro by defining new
    methods for the "assert-expr" multimethod.  These methods are
    called during expansion of the "is" macro, so they should return
    quoted forms to be evaluated.
    You can plug in your own test-reporting framework by rebinding
    the "report" function: (report event)
    The 'event' argument is a map.  It will always have a :type key,
    whose value will be a keyword signaling the type of event being
    reported.  Standard events with :type value of :pass, :fail, and
    :error are called when an assertion passes, fails, and throws an
    exception, respectively.  In that case, the event will also have
    the following keys:
      :expected   The form that was expected to be true
      :actual     A form representing what actually occurred
      :message    The string message given as an argument to 'is'
    The "testing" strings will be a list in "*testing-contexts*", and
    the vars being tested will be a list in "*testing-vars*".
    Your "report" function should wrap any printing calls in the
    "with-test-out" macro, which rebinds *out* to the current value
    of *test-out*.
    For additional event types, see the examples in the code.

    — Stuart Sierra, with contributions and suggestions by Chas Emerick, Allen Rohner, and Stuart Halloway

    True by default.  If set to false, no test functions will
    be created by deftest, set-test, or with-test.  Use this to omit
    tests when compiling or loading production code.
    The maximum depth of stack traces to print when an Exception
    is thrown during a test.  Defaults to nil, which means print the 
    complete stack trace.
    (add-ns-meta key coll)
    Adds elements in coll to the current namespace metadata as the
    value of key.
    (are argv expr & args)
    Checks multiple assertions with a template expression.
    See clojure.template/do-template for an explanation of
    Example: (are [x y] (= x y)  
                  2 (+ 1 1)
                  4 (* 2 2))
    Expands to: 
             (do (is (= 2 (+ 1 1)))
                 (is (= 4 (* 2 2))))
    Note: This breaks some reporting features, such as line numbers.
    (assert-any msg form)
    Returns generic assertion code for any test, including macros, Java
    method calls, or isolated symbols.
    (assert-predicate msg form)
    Returns generic assertion code for any functional predicate.  The
    'expected' argument to 'report' will contains the original form, the
    'actual' argument will contain the form with all its sub-forms
    evaluated.  If the predicate returns false, the 'actual' form will
    be wrapped in (not...).
    (compose-fixtures f1 f2)
    Composes two fixture functions, creating a new fixture function
    that combines their behavior.
    (default-fixture f)
    The default, empty, fixture function.  Just calls its argument.
    (deftest name & body)
    Defines a test function with no arguments.  Test functions may call
    other tests, so tests may be composed.  If you compose tests, you
    should also define a function named test-ns-hook; run-tests will
    call test-ns-hook instead of testing all vars.
    Note: Actually, the test body goes in the :test metadata on the var,
    and the real function (the value of the var) calls test-var on
    When *load-tests* is false, deftest is ignored.
    (deftest- name & body)
    Like deftest but creates a private var.
    (do-report m)
    Add file and line information to a test result and call report.
    If you are writing a custom assert-expr method, call this function
    to pass test results to report.
    (file-and-line exception depth)
    (file-position n)
    Returns a vector [filename line-number] for the nth call up the
    Deprecated in 1.2: The information needed for test reporting is
    now on :file and :line keys in the result map.
    (function? x)
    Returns true if argument is a function or a symbol that resolves to
    a function (not a macro).
    (get-possibly-unbound-var v)
    Like var-get but returns nil if the var is unbound.
    (inc-report-counter name)
    Increments the named counter in *report-counters*, a ref to a map.
    Does nothing if *report-counters* is nil.
    (is form)(is form msg)
    Generic assertion macro.  'form' is any predicate test.
    'msg' is an optional message to attach to the assertion.
    Example: (is (= 4 (+ 2 2)) "Two plus two should be 4")
    Special forms:
    (is (thrown? c body)) checks that an instance of c is thrown from
    body, fails if not; then returns the thing thrown.
    (is (thrown-with-msg? c re body)) checks that an instance of c is
    thrown AND that the message on the exception matches (with
    re-find) the regular expression re.
    (join-fixtures fixtures)
    Composes a collection of fixtures, in order.  Always returns a valid
    fixture function, even if the collection is empty.
    Generic reporting function, may be overridden to plug in
    different report formats (e.g., TAP, JUnit).  Assertions such as
    'is' call 'report' to indicate results.  The argument given to
    'report' will be a map with a :type key.  See the documentation at
    the top of test_is.clj for more information on the types of
    arguments for 'report'.
    (run-all-tests)(run-all-tests re)
    Runs all tests in all namespaces; prints results.
    Optional argument is a regular expression; only namespaces with
    names matching the regular expression (with re-matches) will be
    (run-tests)(run-tests & namespaces)
    Runs all tests in the given namespaces; prints results.
    Defaults to current namespace if none given.  Returns a map
    summarizing test results.
    (set-test name & body)
    Sets :test metadata of the named var to a fn with the given body.
    The var must already exist.  Does not modify the value of the var.
    When *load-tests* is false, set-test is ignored.
    (stacktrace-file-and-line stacktrace)
    (successful? summary)
    Returns true if the given test summary indicates all tests
    were successful, false otherwise.
    (test-all-vars ns)
    Calls test-vars on every var interned in the namespace, with fixtures.
    (test-ns ns)
    If the namespace defines a function named test-ns-hook, calls that.
    Otherwise, calls test-all-vars on the namespace.  'ns' is a
    namespace object or a symbol.
    Internally binds *report-counters* to a ref initialized to
    *initial-report-counters*.  Returns the final, dereferenced state of
    (test-var v)
    If v has a function in its :test metadata, calls that function,
    with *testing-vars* bound to (conj *testing-vars* v).
    (test-vars vars)
    Groups vars by their namespace and runs test-vars on them with
    appropriate fixtures applied.
    (testing string & body)
    Adds a new string to the list of testing contexts.  May be nested,
    but must occur inside a test function (deftest).
    Returns a string representation of the current test context. Joins
    strings in *testing-contexts* with spaces.
    (testing-vars-str m)
    Returns a string representation of the current test.  Renders names
    in *testing-vars* as a list, then the source file and line of
    current assertion.
    (try-expr msg form)
    Used by the 'is' macro to catch unexpected exceptions.
    You don't call this.
    Wrap test runs in a fixture function to perform setup and
    teardown. Using a fixture-type of :each wraps every test
    individually, while :once wraps the whole run in a single function.
    (with-test definition & body)
    Takes any definition form (that returns a Var) as the first argument.
    Remaining body goes in the :test metadata function for that Var.
    When *load-tests* is false, only evaluates the definition, ignoring
    the tests.
    (with-test-out & body)
    Runs body with *out* bound to the value of *test-out*.