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test_speed.py
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test_speed.py
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"""Test speed."""
import
pytest
from
metar
.
Datatypes
import
speed
,
UnitsError
def
test_defaults
():
"""Test basic usage."""
assert
speed
(
"10"
).
value
()
==
10.0
assert
speed
(
"5"
).
string
()
==
"5 mps"
assert
speed
(
"10"
,
"KT"
).
value
()
==
10.0
assert
speed
(
"5"
,
"KT"
).
string
()
==
"5 knots"
assert
speed
(
"5"
,
"KMH"
).
string
()
==
"5 km/h"
assert
speed
(
"5"
,
"MPH"
).
string
()
==
"5 mph"
assert
speed
(
"5"
,
None
).
string
()
==
"5 mps"
def
test_inputs
():
"""Test inputs."""
assert
speed
(
"10"
).
value
()
==
10.0
assert
speed
(
10
).
value
()
==
10.0
assert
speed
(
10.0
).
value
()
==
10.0
assert
speed
(
10.0
,
None
).
value
()
==
10.0
assert
speed
(
"10"
,
gtlt
=
">"
).
value
()
==
10.0
assert
speed
(
"10"
,
None
,
"<"
).
value
()
==
10.0
def
test_error_checking
():
"""Test exception raising."""
with
pytest
.
raises
(
ValueError
):
speed
(
"10KT"
)
with
pytest
.
raises
(
ValueError
):
speed
(
"10"
,
"MPS"
,
"="
)
with
pytest
.
raises
(
ValueError
):
speed
(
"60"
,
"KT"
,
"gt"
)
with
pytest
.
raises
(
UnitsError
):
speed
(
"10"
,
"NM"
)
with
pytest
.
raises
(
UnitsError
):
speed
(
speed
(
"10"
).
value
,
"furlongs per fortnight"
)
with
pytest
.
raises
(
UnitsError
):
speed
(
speed
(
"5"
).
string
,
"fps"
)
def
test_conversions
():
"""Test unit conversions."""
assert
speed
(
"10"
,
"MPS"
).
value
(
"MPS"
)
==
10.0
assert
speed
(
"10"
,
"MPS"
).
value
(
"KMH"
)
==
36.0
assert
abs
(
speed
(
"10"
,
"MPS"
).
value
(
"MPH"
)
-
22.4
)
<
0.1
assert
abs
(
speed
(
"10"
,
"MPS"
).
value
(
"KT"
)
-
19.4
)
<
0.1
assert
speed
(
"10"
,
"KT"
).
value
(
"KT"
)
==
10.0
assert
abs
(
speed
(
"10"
,
"KT"
).
value
(
"MPH"
)
-
11.5
)
<
0.1
assert
abs
(
speed
(
"10"
,
"KT"
).
value
(
"MPS"
)
-
5.1
)
<
0.1
assert
abs
(
speed
(
"10"
,
"KT"
).
value
(
"KMH"
)
-
18.5
)
<
0.1
assert
speed
(
"10"
,
"MPH"
).
value
(
"MPH"
)
==
10.0
assert
abs
(
speed
(
"10"
,
"MPH"
).
value
(
"KT"
)
-
8.7
)
<
0.1
assert
abs
(
speed
(
"10"
,
"MPH"
).
value
(
"MPS"
)
-
4.5
)
<
0.1
assert
abs
(
speed
(
"10"
,
"MPH"
).
value
(
"KMH"
)
-
16.1
)
<
0.1
assert
speed
(
"10"
,
"KMH"
).
value
(
"KMH"
)
==
10.0
assert
abs
(
speed
(
"10"
,
"KMH"
).
value
(
"KT"
)
-
5.4
)
<
0.1
assert
abs
(
speed
(
"10"
,
"KMH"
).
value
(
"MPS"
)
-
2.8
)
<
0.1
assert
abs
(
speed
(
"10"
,
"KMH"
).
value
(
"MPH"
)
-
6.2
)
<
0.1
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