test: Strip whitespace when comparing numpy dtypes for 1.22 compat (#3682)

* test: Strip whitespace when comparing numpy dtypes for 1.22 compat

Strip whitespace when comparing numpy dtype str() in order to preserve
test compatibility with both numpy 1.22 and older versions whose output
differ by whitespace.

Fixes #3680

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Author: mgorny

tests/test_numpy_dtypes.py

@@ -32,8 +32,8 @@ def dt_fmt():
     e = "<" if byteorder == "little" else ">"
     return (
         "{{'names':['bool_','uint_','float_','ldbl_'],"
-        " 'formats':['?','" + e + "u4','" + e + "f4','" + e + "f{}'],"
-        " 'offsets':[0,4,8,{}], 'itemsize':{}}}"
+        "'formats':['?','" + e + "u4','" + e + "f4','" + e + "f{}'],"
+        "'offsets':[0,4,8,{}],'itemsize':{}}}"
     )
 
 
@@ -46,7 +46,7 @@ def simple_dtype_fmt():
 def packed_dtype_fmt():
     from sys import byteorder
 
-    return "[('bool_', '?'), ('uint_', '{e}u4'), ('float_', '{e}f4'), ('ldbl_', '{e}f{}')]".format(
+    return "[('bool_','?'),('uint_','{e}u4'),('float_','{e}f4'),('ldbl_','{e}f{}')]".format(
         np.dtype("longdouble").itemsize, e="<" if byteorder == "little" else ">"
     )
 
@@ -77,7 +77,7 @@ def partial_nested_fmt():
     partial_size = partial_ld_off + ld.itemsize
     partial_end_padding = partial_size % np.dtype("uint64").alignment
     partial_nested_size = partial_nested_off * 2 + partial_size + partial_end_padding
-    return "{{'names':['a'], 'formats':[{}], 'offsets':[{}], 'itemsize':{}}}".format(
+    return "{{'names':['a'],'formats':[{}],'offsets':[{}],'itemsize':{}}}".format(
         partial_dtype_fmt(), partial_nested_off, partial_nested_size
     )
 
@@ -123,25 +123,25 @@ def test_dtype(simple_dtype):
 
     e = "<" if byteorder == "little" else ">"
 
-    assert m.print_dtypes() == [
+    assert [x.replace(" ", "") for x in m.print_dtypes()] == [
         simple_dtype_fmt(),
         packed_dtype_fmt(),
-        "[('a', {}), ('b', {})]".format(simple_dtype_fmt(), packed_dtype_fmt()),
+        "[('a',{}),('b',{})]".format(simple_dtype_fmt(), packed_dtype_fmt()),
         partial_dtype_fmt(),
         partial_nested_fmt(),
-        "[('a', 'S3'), ('b', 'S3')]",
+        "[('a','S3'),('b','S3')]",
         (
-            "{{'names':['a','b','c','d'], "
-            + "'formats':[('S4', (3,)),('"
+            "{{'names':['a','b','c','d'],"
+            + "'formats':[('S4',(3,)),('"
             + e
-            + "i4', (2,)),('u1', (3,)),('"
+            + "i4',(2,)),('u1',(3,)),('"
             + e
-            + "f4', (4, 2))], "
-            + "'offsets':[0,12,20,24], 'itemsize':56}}"
+            + "f4',(4,2))],"
+            + "'offsets':[0,12,20,24],'itemsize':56}}"
         ).format(e=e),
-        "[('e1', '" + e + "i8'), ('e2', 'u1')]",
-        "[('x', 'i1'), ('y', '" + e + "u8')]",
-        "[('cflt', '" + e + "c8'), ('cdbl', '" + e + "c16')]",
+        "[('e1','" + e + "i8'),('e2','u1')]",
+        "[('x','i1'),('y','" + e + "u8')]",
+        "[('cflt','" + e + "c8'),('cdbl','" + e + "c16')]",
     ]
 
     d1 = np.dtype(
@@ -238,15 +238,15 @@ def test_recarray(simple_dtype, packed_dtype):
     ]
 
     arr = m.create_rec_partial(3)
-    assert str(arr.dtype) == partial_dtype_fmt()
+    assert str(arr.dtype).replace(" ", "") == partial_dtype_fmt()
     partial_dtype = arr.dtype
     assert "" not in arr.dtype.fields
     assert partial_dtype.itemsize > simple_dtype.itemsize
     assert_equal(arr, elements, simple_dtype)
     assert_equal(arr, elements, packed_dtype)
 
     arr = m.create_rec_partial_nested(3)
-    assert str(arr.dtype) == partial_nested_fmt()
+    assert str(arr.dtype).replace(" ", "") == partial_nested_fmt()
     assert "" not in arr.dtype.fields
     assert "" not in arr.dtype.fields["a"][0].fields
     assert arr.dtype.itemsize > partial_dtype.itemsize
@@ -285,12 +285,12 @@ def test_array_array():
     e = "<" if byteorder == "little" else ">"
 
     arr = m.create_array_array(3)
-    assert str(arr.dtype) == (
-        "{{'names':['a','b','c','d'], "
-        + "'formats':[('S4', (3,)),('"
+    assert str(arr.dtype).replace(" ", "") == (
+        "{{'names':['a','b','c','d'],"
+        + "'formats':[('S4',(3,)),('"
         + e
-        + "i4', (2,)),('u1', (3,)),('{e}f4', (4, 2))], "
-        + "'offsets':[0,12,20,24], 'itemsize':56}}"
+        + "i4',(2,)),('u1',(3,)),('{e}f4',(4,2))],"
+        + "'offsets':[0,12,20,24],'itemsize':56}}"
     ).format(e=e)
     assert m.print_array_array(arr) == [
         "a={{A,B,C,D},{K,L,M,N},{U,V,W,X}},b={0,1},"