Add a test for the ignore-unknown-dependency command line option.

Author: RKrahl

tests/test_04_ignore_unknown.py

@@ -0,0 +1,72 @@
+"""Test the ignore-unknown-dependency command line option.
+"""
+
+import pytest
+
+
+def test_no_ignore(ctestdir):
+    """No command line option, e.g. ignore-unknown-dependency is not set.
+
+    Explicitly select only a single test that depends on another one.
+    Since the other test has not been run at all, the selected test
+    will be skipped.
+    """
+    ctestdir.makepyfile("""
+        import pytest
+
+        @pytest.mark.dependency()
+        def test_a():
+            pass
+
+        @pytest.mark.dependency()
+        def test_b():
+            pass
+
+        @pytest.mark.dependency()
+        def test_c():
+            pass
+
+        @pytest.mark.dependency(depends=["test_c"])
+        def test_d():
+            pass
+    """)
+    result = ctestdir.runpytest("--verbose", "test_no_ignore.py::test_d")
+    result.assert_outcomes(passed=0, skipped=1, failed=0)
+    result.stdout.fnmatch_lines("""
+        *::test_d SKIPPED
+    """)
+
+
+def test_ignore(ctestdir):
+    """Set the ignore-unknown-dependency command line option.
+
+    Explicitly select only a single test that depends on another one.
+    The other test has not been run at all, but since unknown
+    dependencies will be ignored, the selected test will be run
+    nevertheless.
+    """
+    ctestdir.makepyfile("""
+        import pytest
+
+        @pytest.mark.dependency()
+        def test_a():
+            pass
+
+        @pytest.mark.dependency()
+        def test_b():
+            pass
+
+        @pytest.mark.dependency()
+        def test_c():
+            pass
+
+        @pytest.mark.dependency(depends=["test_c"])
+        def test_d():
+            pass
+    """)
+    result = ctestdir.runpytest("--verbose", "--ignore-unknown-dependency", 
+                                "test_ignore.py::test_d")
+    result.assert_outcomes(passed=1, skipped=0, failed=0)
+    result.stdout.fnmatch_lines("""
+        *::test_d PASSED
+    """)