diff --git a/news/3630.trivial.rst b/news/3630.trivial.rst
new file mode 100644
index 00000000..a5d0d6c1
--- /dev/null
+++ b/news/3630.trivial.rst
@@ -0,0 +1 @@
+Adapt test cases to prefer the mocked PyPI.
diff --git a/tests/integration/test_cli.py b/tests/integration/test_cli.py
index 04253fc5..711f8daa 100644
--- a/tests/integration/test_cli.py
+++ b/tests/integration/test_cli.py
@@ -164,7 +164,7 @@ def test_pipenv_clean_pip_no_warnings(PipenvInstance):
             f.write('from setuptools import setup; setup(name="empty")')
         c = p.pipenv('install -e .')
         assert c.return_code == 0
-        c = p.pipenv('run pip install pytz')
+        c = p.pipenv('run pip install -i {} pytz'.format(p.index_url))
         assert c.return_code == 0
         c = p.pipenv('clean')
         assert c.return_code == 0
@@ -178,7 +178,7 @@ def test_pipenv_clean_pip_warnings(PipenvInstance):
             f.write('from setuptools import setup; setup(name="empty")')
         # create a fake git repo to trigger a pip freeze warning
         os.mkdir('.git')
-        c = p.pipenv("run pip install -e .")
+        c = p.pipenv("run pip install -i {} -e .".format(p.index_url))
         assert c.return_code == 0
         c = p.pipenv('clean')
         assert c.return_code == 0
diff --git a/tests/integration/test_install_markers.py b/tests/integration/test_install_markers.py
index 84237eb5..a0c3a279 100644
--- a/tests/integration/test_install_markers.py
+++ b/tests/integration/test_install_markers.py
@@ -158,6 +158,7 @@ def test_resolver_unique_markers(PipenvInstance):
 
 @flaky
 @pytest.mark.project
+@pytest.mark.needs_internet
 def test_environment_variable_value_does_not_change_hash(PipenvInstance):
     with PipenvInstance(chdir=True) as p:
         with temp_environ():
diff --git a/tests/integration/test_lock.py b/tests/integration/test_lock.py
index 48232e60..2f7e0bd0 100644
--- a/tests/integration/test_lock.py
+++ b/tests/integration/test_lock.py
@@ -622,11 +622,11 @@ def test_lock_with_incomplete_source(PipenvInstance):
         with open(p.pipfile_path, 'w') as f:
             f.write("""
 [[source]]
-url = "https://test.pypi.org/simple"
+url = "{}"
 
 [packages]
 requests = "*"
-            """)
+            """.format(p.index_url))
         c = p.pipenv('install --skip-lock')
         assert c.return_code == 0
         c = p.pipenv('install')
@@ -697,13 +697,13 @@ def test_lock_after_update_source_name(PipenvInstance):
     with PipenvInstance(chdir=True) as p:
         contents = """
 [[source]]
-url = "https://test.pypi.org/simple"
+url = "{}"
 verify_ssl = true
 name = "test"
 
 [packages]
 six = "*"
-        """.strip()
+        """.format(p.index_url).strip()
         with open(p.pipfile_path, 'w') as f:
             f.write(contents)
         c = p.pipenv("lock")
diff --git a/tests/integration/test_project.py b/tests/integration/test_project.py
index ad38d74a..dac05d34 100644
--- a/tests/integration/test_project.py
+++ b/tests/integration/test_project.py
@@ -121,6 +121,7 @@ def test_maintain_file_line_endings(PipenvInstance, newlines):
 
 @pytest.mark.project
 @pytest.mark.sources
+@pytest.mark.needs_internet
 def test_many_indexes(PipenvInstance):
     with PipenvInstance(chdir=True) as p:
         with open(p.pipfile_path, 'w') as f:
@@ -184,13 +185,15 @@ def test_run_in_virtualenv_with_global_context(PipenvInstance, virtualenv):
             project.virtualenv_location, virtualenv.as_posix()
         )
         c = delegator_run(
-            "pipenv run pip install click", cwd=os.path.abspath(p.path),
+            "pipenv run pip install -i {} click".format(p.index_url),
+            cwd=os.path.abspath(p.path),
             env=os.environ.copy()
         )
         assert c.return_code == 0, (c.out, c.err)
         assert "Courtesy Notice" in c.err, (c.out, c.err)
         c = delegator_run(
-            "pipenv install six", cwd=os.path.abspath(p.path), env=os.environ.copy()
+            "pipenv install -i {} six".format(p.index_url),
+            cwd=os.path.abspath(p.path), env=os.environ.copy()
         )
         assert c.return_code == 0, (c.out, c.err)
         c = delegator_run(
diff --git a/tests/integration/test_windows.py b/tests/integration/test_windows.py
index 7355bbd0..43efaef1 100644
--- a/tests/integration/test_windows.py
+++ b/tests/integration/test_windows.py
@@ -75,7 +75,7 @@ def test_pipenv_clean_windows(PipenvInstance):
     with PipenvInstance(chdir=True) as p:
         c = p.pipenv('install requests')
         assert c.return_code == 0
-        c = p.pipenv('run pip install click')
+        c = p.pipenv('run pip install -i {} click'.format(p.index_url))
         assert c.return_code == 0
 
         c = p.pipenv('clean --dry-run')