Try to address these sproadic test failures without skipping the test.

pipenv/cli/command.py

@@ -756,7 +756,6 @@ def requirements(state, dev=False, dev_only=False, hash=False, exclude_markers=F
     pip_deps = convert_deps_to_pip(
         deps,
         project=None,
-        r=False,
         include_index=False,
         include_hashes=hash,
         include_markers=not exclude_markers,

pipenv/core.py

@@ -2048,7 +2048,7 @@ def do_install(
                 if not is_star(section[package__name]) and is_star(package__val):
                     # Support for VCS dependencies.
                     package_args[i] = convert_deps_to_pip(
-                        {package__name: section[package__name]}, project=project, r=False
+                        {package__name: section[package__name]}, project=project
                     )[0]
             except KeyError:
                 pass

pipenv/utils/dependencies.py

@@ -1,10 +1,10 @@
 import os
 from contextlib import contextmanager
-from tempfile import NamedTemporaryFile
 from typing import Mapping, Sequence
 
 from pipenv.patched.pip._vendor.packaging.markers import Marker
 from pipenv.patched.pip._vendor.packaging.version import parse
+from pipenv.vendor.requirementslib.models.requirements import Requirement
 
 from .constants import SCHEME_LIST, VCS_LIST
 from .shell import temp_path
@@ -245,14 +245,11 @@ def is_pinned_requirement(ireq):
 def convert_deps_to_pip(
     deps,
     project=None,
-    r=True,
     include_index=True,
     include_hashes=True,
     include_markers=True,
 ):
     """ "Converts a Pipfile-formatted dependency to a pip-formatted one."""
-    from pipenv.vendor.requirementslib.models.requirements import Requirement
-
     dependencies = []
     for dep_name, dep in deps.items():
         if project:
@@ -268,14 +265,7 @@ def convert_deps_to_pip(
             include_markers=include_markers,
         ).strip()
         dependencies.append(req)
-    if not r:
-        return dependencies
-
-    # Write requirements.txt to tmp directory.
-    f = NamedTemporaryFile(suffix="-requirements.txt", delete=False)
-    f.write("\n".join(dependencies).encode("utf-8"))
-    f.close()
-    return f.name
+    return dependencies
 
 
 def get_constraints_from_deps(deps):

pipenv/utils/resolver.py

@@ -1027,7 +1027,7 @@ def venv_resolve_deps(
             # dependency resolution on them, so we are including this step inside the
             # spinner context manager for the UX improvement
             sp.write(decode_for_output("Building requirements..."))
-            deps = convert_deps_to_pip(deps, project, r=False, include_index=True)
+            deps = convert_deps_to_pip(deps, project, include_index=True)
             constraints = set(deps)
             os.environ["PIPENV_PACKAGES"] = str("\n".join(constraints))
             sp.write(decode_for_output("Resolving dependencies..."))

tests/unit/test_utils.py

@@ -15,8 +15,6 @@ from pipenv.exceptions import PipenvUsageError
 
 # Pipfile format <-> requirements.txt format.
 DEP_PIP_PAIRS = [
-    ({"requests": "*"}, "requests"),
-    ({"requests": {"extras": ["socks"], "version": "*"}}, "requests[socks]"),
     ({"django": ">1.10"}, "django>1.10"),
     ({"Django": ">1.10"}, "Django>1.10"),
     ({"requests": {"extras": ["socks"], "version": ">1.10"}}, "requests[socks]>1.10"),
@@ -89,7 +87,25 @@ def mock_unpack(link, source_dir, download_dir, only_download=False, session=Non
 def test_convert_deps_to_pip(deps, expected):
     if expected.startswith("Django"):
         expected = expected.lower()
-    assert dependencies.convert_deps_to_pip(deps, r=False) == [expected]
+    assert dependencies.convert_deps_to_pip(deps) == [expected]
+
+
+@flaky
+@pytest.mark.utils
+@pytest.mark.needs_internet
+def test_convert_deps_to_pip_flaky():
+    deps = {"requests": "*"}
+    expected = "requests"
+    assert dependencies.convert_deps_to_pip(deps) == [expected]
+
+
+@flaky
+@pytest.mark.utils
+@pytest.mark.needs_internet
+def test_convert_deps_to_pip_flaky2():
+    deps = {"requests": {"extras": ["socks"], "version": "*"}}
+    expected = "requests[socks]"
+    assert dependencies.convert_deps_to_pip(deps) == [expected]
 
 
 @flaky
@@ -97,8 +113,6 @@ def test_convert_deps_to_pip(deps, expected):
 @pytest.mark.parametrize(
     "deps, expected",
     [
-        # This one should be collapsed and treated as {'requests': '*'}.
-        ({"requests": {}}, "requests"),
         # Hash value should be passed into the result.
         (
             {
@@ -132,24 +146,34 @@ def test_convert_deps_to_pip(deps, expected):
     ],
 )
 def test_convert_deps_to_pip_one_way(deps, expected):
-    assert dependencies.convert_deps_to_pip(deps, r=False) == [expected.lower()]
+    assert dependencies.convert_deps_to_pip(deps) == [expected.lower()]
+
+
+@flaky
+@pytest.mark.utils
+def test_convert_deps_to_pip_one_way_flaky():
+    deps = {"requests": dict()}
+    expected = "requests"
+    assert dependencies.convert_deps_to_pip(deps) == [expected.lower()]
+
 
 @pytest.mark.utils
 @pytest.mark.parametrize(
     "deps, expected",
     [
         ({"requests": {}}, ["requests"]),
-        ({"FooProject": {"path": ".", "editable" : "true"}}, []),
+        ({"FooProject": {"path": ".", "editable": "true"}}, []),
         ({"FooProject": {"version": "==1.2"}}, ["fooproject==1.2"]),
         ({"requests": {"extras": ["security"]}}, []),
         ({"requests": {"extras": []}}, ["requests"]),
-        ({"extras" : {}}, ["extras"]),
-        ({"uvicorn[standard]" : {}}, [])
+        ({"extras": {}}, ["extras"]),
+        ({"uvicorn[standard]": {}}, [])
     ],
 )
 def test_get_constraints_from_deps(deps, expected):
     assert dependencies.get_constraints_from_deps(deps) == expected
 
+
 @pytest.mark.parametrize("line,result", [
     ("-i https://example.com/simple/", ("https://example.com/simple/", None, None, [])),
     ("--extra-index-url=https://example.com/simple/", (None, "https://example.com/simple/", None, [])),