"""Test that stanc warnings are visible."""
import contextlib
import io

import stan


def test_stanc_no_warning() -> None:
    """No warnings."""
    program_code = "parameters {real y;} model {y ~ normal(0,1);}"
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "warning" not in buffer.getvalue().lower()


def test_stanc_warning() -> None:
    """Test that stanc warning is shown to user."""
    # stanc prints warning:
    # assignment operator <- is deprecated in the Stan language; use = instead.
    program_code = """
    parameters {
    real y;
    }
    model {
    real x;
    x <- 5;
    }
    """
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "assignment operator <- is deprecated in the Stan language" in buffer.getvalue()

"""Test that stanc warnings are visible."""
import contextlib
import io

import stan


def test_stanc_no_warning() -> None:
    """No warnings."""
    program_code = "parameters {real y;} model {y ~ normal(0,1);}"
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "warning" not in buffer.getvalue().lower()


def test_stanc_unused_warning() -> None:
    """Test that stanc warning is shown to user."""
    program_code = """
    parameters {
    real y;
    }
    model {
    real x;
    x = 5;
    }
    """
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "The parameter y was declared but was not used in the density" in buffer.getvalue()


def test_stanc_assignment_warning() -> None:
    """Test that stanc warning is shown to user."""
    # stanc prints warning:
    # assignment operator <- is deprecated in the Stan language; use = instead.
    program_code = """
    parameters {
    real y;
    }
    model {
    real x;
    x <- 5;
    y ~ normal(0,1);
    }
    """
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "operator <- is deprecated in the Stan language and will be removed" in buffer.getvalue(), buffer.getvalue()

Update test for Stan 2.29
test: Update test for Stan 2.29

  """Test that stanc warnings are visible."""
  import contextlib
  import io
  
  import stan
  
  
  def test_stanc_no_warning() -> None:
      """No warnings."""
      program_code = "parameters {real y;} model {y ~ normal(0,1);}"
      buffer = io.StringIO()
      with contextlib.redirect_stderr(buffer):
          stan.build(program_code=program_code)
      assert "warning" not in buffer.getvalue().lower()
  
  
- def test_stanc_warning() -> None:
+ def test_stanc_unused_warning() -> None:
+     """Test that stanc warning is shown to user."""
+     program_code = """
+     parameters {
+     real y;
+     }
+     model {
+     real x;
+     x = 5;
+     }
+     """
+     buffer = io.StringIO()
+     with contextlib.redirect_stderr(buffer):
+         stan.build(program_code=program_code)
+     assert "The parameter y was declared but was not used in the density" in buffer.getvalue()
+ 
+ 
+ def test_stanc_assignment_warning() -> None:
      """Test that stanc warning is shown to user."""
      # stanc prints warning:
      # assignment operator <- is deprecated in the Stan language; use = instead.
      program_code = """
      parameters {
      real y;
      }
      model {
      real x;
      x <- 5;
+     y ~ normal(0,1);
      }
      """
      buffer = io.StringIO()
      with contextlib.redirect_stderr(buffer):
          stan.build(program_code=program_code)
-     assert "assignment operator <- is deprecated in the Stan language" in buffer.getvalue()
+     assert "operator <- is deprecated in the Stan language and will be removed" in buffer.getvalue(), buffer.getvalue()
  
Update test for Stan 2.29
## Code Before:
"""Test that stanc warnings are visible."""
import contextlib
import io

import stan


def test_stanc_no_warning() -> None:
    """No warnings."""
    program_code = "parameters {real y;} model {y ~ normal(0,1);}"
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "warning" not in buffer.getvalue().lower()


def test_stanc_warning() -> None:
    """Test that stanc warning is shown to user."""
    # stanc prints warning:
    # assignment operator <- is deprecated in the Stan language; use = instead.
    program_code = """
    parameters {
    real y;
    }
    model {
    real x;
    x <- 5;
    }
    """
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "assignment operator <- is deprecated in the Stan language" in buffer.getvalue()

## Instruction:
Update test for Stan 2.29
## Code After:
"""Test that stanc warnings are visible."""
import contextlib
import io

import stan


def test_stanc_no_warning() -> None:
    """No warnings."""
    program_code = "parameters {real y;} model {y ~ normal(0,1);}"
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "warning" not in buffer.getvalue().lower()


def test_stanc_unused_warning() -> None:
    """Test that stanc warning is shown to user."""
    program_code = """
    parameters {
    real y;
    }
    model {
    real x;
    x = 5;
    }
    """
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "The parameter y was declared but was not used in the density" in buffer.getvalue()


def test_stanc_assignment_warning() -> None:
    """Test that stanc warning is shown to user."""
    # stanc prints warning:
    # assignment operator <- is deprecated in the Stan language; use = instead.
    program_code = """
    parameters {
    real y;
    }
    model {
    real x;
    x <- 5;
    y ~ normal(0,1);
    }
    """
    buffer = io.StringIO()
    with contextlib.redirect_stderr(buffer):
        stan.build(program_code=program_code)
    assert "operator <- is deprecated in the Stan language and will be removed" in buffer.getvalue(), buffer.getvalue()
