integration: validate requirements.txt is picked up and parsed

Signed-off-by: Alfredo Deza <adeza@anchore.com>

integration/fixture_pkg_coverage_test.go

@@ -67,6 +67,14 @@ var cases = []struct {
 			"requests": "2.22.0",
 		},
 	},
+	{
+		name:        "find python packages",
+		pkgType:     pkg.PythonRequirementsPkg,
+		pkgLanguage: pkg.Python,
+		pkgInfo: map[string]string{
+			"flask": "4.0.0",
+		},
+	},
 	{
 		name:        "find bundler packages",
 		pkgType:     pkg.BundlerPkg,

integration/test-fixtures/image-pkg-coverage/python/requires/requirements.txt

@@ -0,0 +1,3 @@
+flask==4.0.0
+# this is an ignored line
+