graph: add Is*(err error) checker tests

graph/quadwriter_test.go

@@ -0,0 +1,63 @@
+package graph
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestIsQuadExist(t *testing.T) {
+	tests := []struct {
+		Err     error
+		Matches bool
+	}{
+		{Err: nil, Matches: false},
+		{Err: errors.New("foo"), Matches: false},
+		{Err: ErrQuadExists, Matches: true},
+		{Err: &DeltaError{Err: errors.New("foo")}, Matches: false},
+		{Err: &DeltaError{Err: ErrQuadExists}, Matches: true},
+	}
+
+	for i, test := range tests {
+		if match := IsQuadExist(test.Err); test.Matches != match {
+			t.Errorf("%d> unexpected match: %t", i, match)
+		}
+	}
+}
+
+func TestIsQuadNotExist(t *testing.T) {
+	tests := []struct {
+		Err     error
+		Matches bool
+	}{
+		{Err: nil, Matches: false},
+		{Err: errors.New("foo"), Matches: false},
+		{Err: ErrQuadNotExist, Matches: true},
+		{Err: &DeltaError{Err: errors.New("foo")}, Matches: false},
+		{Err: &DeltaError{Err: ErrQuadNotExist}, Matches: true},
+	}
+
+	for i, test := range tests {
+		if match := IsQuadNotExist(test.Err); test.Matches != match {
+			t.Errorf("%d> unexpected match: %t", i, match)
+		}
+	}
+}
+
+func TestIsInvalidAction(t *testing.T) {
+	tests := []struct {
+		Err     error
+		Matches bool
+	}{
+		{Err: nil, Matches: false},
+		{Err: errors.New("foo"), Matches: false},
+		{Err: ErrInvalidAction, Matches: true},
+		{Err: &DeltaError{Err: errors.New("foo")}, Matches: false},
+		{Err: &DeltaError{Err: ErrInvalidAction}, Matches: true},
+	}
+
+	for i, test := range tests {
+		if match := IsInvalidAction(test.Err); test.Matches != match {
+			t.Errorf("%d> unexpected match: %t", i, match)
+		}
+	}
+}