address coverage

Signed-off-by: quobix <dave@quobix.com>

datamodel/low/base/schema_test.go

@@ -1756,3 +1756,62 @@ components:
 
 	assert.Equal(t, 3.0, res.Value.Schema().ExclusiveMaximum.Value.B)
 }
+
+func TestSchema_EmptyySchemaRef(t *testing.T) {
+	yml := `openapi: 3.0.3
+components:
+  schemas:
+    Something:
+      $ref: ''`
+
+	var iNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &iNode)
+	assert.NoError(t, mErr)
+
+	config := index.CreateOpenAPIIndexConfig()
+	config.SpecInfo = &datamodel.SpecInfo{
+		VersionNumeric: 3.0,
+	}
+
+	idx := index.NewSpecIndexWithConfig(&iNode, config)
+
+	yml = `schema:
+  $ref: ''`
+
+	var idxNode yaml.Node
+	_ = yaml.Unmarshal([]byte(yml), &idxNode)
+
+	res, e := ExtractSchema(context.Background(), idxNode.Content[0], idx)
+	assert.Nil(t, res)
+	assert.Equal(t, "schema build failed: reference '[empty]' cannot be found at line 2, col 9", e.Error())
+
+}
+
+func TestSchema_EmptyRef(t *testing.T) {
+	yml := `openapi: 3.0.3
+components:
+  schemas:
+    Something:
+      $ref: ''`
+
+	var iNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &iNode)
+	assert.NoError(t, mErr)
+
+	config := index.CreateOpenAPIIndexConfig()
+	config.SpecInfo = &datamodel.SpecInfo{
+		VersionNumeric: 3.0,
+	}
+
+	idx := index.NewSpecIndexWithConfig(&iNode, config)
+
+	yml = `$ref: ''`
+
+	var idxNode yaml.Node
+	_ = yaml.Unmarshal([]byte(yml), &idxNode)
+
+	res, e := ExtractSchema(context.Background(), idxNode.Content[0], idx)
+	assert.Nil(t, res)
+	assert.Equal(t, "schema build failed: reference '[empty]' cannot be found at line 1, col 7", e.Error())
+
+}

index/rolodex_remote_loader_test.go

@@ -109,6 +109,20 @@ func TestNewRemoteFS_BasicCheck(t *testing.T) {
 	assert.Equal(t, "2015-10-21 07:28:00 +0000 GMT", lastMod.String())
 }
 
+func TestNewRemoteFS_BasicCheck_NoScheme(t *testing.T) {
+
+	server := test_buildServer()
+	defer server.Close()
+
+	remoteFS, _ := NewRemoteFSWithRootURL("")
+	remoteFS.RemoteHandlerFunc = test_httpClient.Get
+
+	file, err := remoteFS.Open("/file1.yaml")
+
+	assert.NoError(t, err)
+	assert.Nil(t, file)
+}
+
 func TestNewRemoteFS_BasicCheck_Relative(t *testing.T) {
 
 	server := test_buildServer()