TST:Updated and Added Test Cases for GH49230

Author: andrewchen1216

pandas/tests/io/formats/test_format.py

@@ -1414,25 +1414,25 @@ def test_to_string_no_index(self):
  assert df_s == expected
 
  def test_to_string_line_width_no_index(self):
- # GH 13998, GH 22505
+ # GH 13998, GH 22505, # GH 49230
  df = DataFrame({"x": [1, 2, 3], "y": [4, 5, 6]})
 
  df_s = df.to_string(line_width=1, index=False)
- expected = " x \\\n 1  \n 2 \n 3 \n\n y \n 4 \n 5 \n 6 "
+ expected = " x  \n 1 \\\n 2 \n 3 \n\n y \n 4 \n 5 \n 6 "
 
  assert df_s == expected
 
  df = DataFrame({"x": [11, 22, 33], "y": [4, 5, 6]})
 
  df_s = df.to_string(line_width=1, index=False)
- expected = " x \\\n11  \n22 \n33 \n\n y \n 4 \n 5 \n 6 "
+ expected = " x  \n11 \\\n22 \n33 \n\n y \n 4 \n 5 \n 6 "
 
  assert df_s == expected
 
  df = DataFrame({"x": [11, 22, -33], "y": [4, 5, -6]})
 
  df_s = df.to_string(line_width=1, index=False)
- expected = " x \\\n 11  \n 22 \n-33 \n\n y \n 4 \n 5 \n-6 "
+ expected = " x  \n 11 \\\n 22 \n-33 \n\n y \n 4 \n 5 \n-6 "
 
  assert df_s == expected
 
@@ -1686,6 +1686,20 @@ def test_to_string_line_width(self):
  s = df.to_string(line_width=80)
  assert max(len(line) for line in s.split("\n")) == 80
 
+ def test_to_string_header_false(self):
+ # GH 49230
+ df = DataFrame([1, 2])
+ df.index.name = "a"
+ s = df.to_string(header=False)
+ expected = "a \n0 1\n1 2"
+ assert s == expected
+
+ df = DataFrame([[1, 2], [3, 4]])
+ df.index.name = "a"
+ s = df.to_string(header=False)
+ expected = "a \n0 1 2\n1 3 4"
+ assert s == expected
+
  def test_show_dimensions(self):
  df = DataFrame(123, index=range(10, 15), columns=range(30))