test: add unit tests for dynamomq errors

error.go

@@ -25,39 +25,39 @@ type ConditionalCheckFailedError struct {
 }
 
 func (e ConditionalCheckFailedError) Error() string {
-	return fmt.Sprintf("Condition on the 'version' attribute has failed: %v", e.Cause)
+	return fmt.Sprintf("Condition on the 'version' attribute has failed: %v.", e.Cause)
 }
 
 type BuildingExpressionError struct {
 	Cause error
 }
 
 func (e BuildingExpressionError) Error() string {
-	return fmt.Sprintf("Failed to build expression: %v:", e.Cause)
+	return fmt.Sprintf("Failed to build expression: %v.", e.Cause)
 }
 
 type DynamoDBAPIError struct {
 	Cause error
 }
 
 func (e DynamoDBAPIError) Error() string {
-	return fmt.Sprintf("Failed DynamoDB API: %v:", e.Cause)
+	return fmt.Sprintf("Failed DynamoDB API: %v.", e.Cause)
 }
 
 type UnmarshalingAttributeError struct {
 	Cause error
 }
 
 func (e UnmarshalingAttributeError) Error() string {
-	return fmt.Sprintf("Failed to unmarshal: %v:", e.Cause)
+	return fmt.Sprintf("Failed to unmarshal: %v.", e.Cause)
 }
 
 type MarshalingAttributeError struct {
 	Cause error
 }
 
 func (e MarshalingAttributeError) Error() string {
-	return fmt.Sprintf("Failed to marshal: %v:", e.Cause)
+	return fmt.Sprintf("Failed to marshal: %v.", e.Cause)
 }
 
 type EmptyQueueError struct{}
@@ -73,5 +73,5 @@ type InvalidStateTransitionError struct {
 }
 
 func (e InvalidStateTransitionError) Error() string {
-	return fmt.Sprintf("operation %s failed for status %s: %s", e.Operation, e.Current, e.Msg)
+	return fmt.Sprintf("operation %s failed for status %s: %s.", e.Operation, e.Current, e.Msg)
 }

error_test.go

@@ -0,0 +1,33 @@
+package dynamomq_test
+
+import (
+	"errors"
+	"testing"
+
+	. "github.com/vvatanabe/dynamomq"
+)
+
+func TestErrors(t *testing.T) {
+	type testCase struct {
+		err      error
+		expected string
+	}
+	tests := []testCase{
+		{IDNotProvidedError{}, "ID was not provided."},
+		{IDNotFoundError{}, "Provided ID was not found in the Dynamo DB."},
+		{IDDuplicatedError{}, "Provided ID was duplicated."},
+		{ConditionalCheckFailedError{Cause: errors.New("sample cause")}, "Condition on the 'version' attribute has failed: sample cause."},
+		{BuildingExpressionError{Cause: errors.New("sample cause")}, "Failed to build expression: sample cause."},
+		{DynamoDBAPIError{Cause: errors.New("sample cause")}, "Failed DynamoDB API: sample cause."},
+		{UnmarshalingAttributeError{Cause: errors.New("sample cause")}, "Failed to unmarshal: sample cause."},
+		{MarshalingAttributeError{Cause: errors.New("sample cause")}, "Failed to marshal: sample cause."},
+		{EmptyQueueError{}, "Cannot proceed, queue is empty."},
+		{InvalidStateTransitionError{Msg: "sample message", Operation: "sample operation", Current: "sample status"}, "operation sample operation failed for status sample status: sample message."},
+	}
+	for _, tc := range tests {
+		if tc.err.Error() != tc.expected {
+			t.Errorf("Unexpected error message. Expected: %v, got: %v", tc.expected, tc.err.Error())
+		}
+	}
+
+}