WIP: Adjusted outputs to increase readability

expectations_go18.go

@@ -30,14 +30,15 @@ func (e *ExpectedQuery) WillReturnRows(rows ...*Rows) *ExpectedQuery {
 }
 
 func (e *queryBasedExpectation) argsMatches(args []driver.NamedValue) error {
+	errMsgFmt := "\nwant\n	%d\n	got\n		%d\n	arguments"
 	if nil == e.args {
 		if e.noArgs && len(args) > 0 {
 			return fmt.Errorf("expected 0, but got %d arguments", len(args))
 		}
 		return nil
 	}
 	if len(args) != len(e.args) {
-		return fmt.Errorf("expected %d, but got %d arguments", len(e.args), len(args))
+		return fmt.Errorf(errMsgFmt, len(e.args), len(args))
 	}
 	// @TODO should we assert either all args are named or ordinal?
 	for k, v := range args {
@@ -54,7 +55,7 @@ func (e *queryBasedExpectation) argsMatches(args []driver.NamedValue) error {
 		if named, isNamed := dval.(sql.NamedArg); isNamed {
 			dval = named.Value
 			if v.Name != named.Name {
-				return fmt.Errorf("named argument %d: name: \"%s\" does not match expected: \"%s\"", k, v.Name, named.Name)
+				return fmt.Errorf("named argument %d: name: '%s' does not match expected: '%s'", k, v.Name, named.Name)
 			}
 		} else if k+1 != v.Ordinal {
 			return fmt.Errorf("argument %d: ordinal position: %d does not match expected: %d", k, k+1, v.Ordinal)
@@ -67,12 +68,28 @@ func (e *queryBasedExpectation) argsMatches(args []driver.NamedValue) error {
 		}
 
 		if !reflect.DeepEqual(darg, v.Value) {
-			return fmt.Errorf("argument %d expected [%T - %+v] does not match actual [%T - %+v]", k, darg, darg, v.Value, v.Value)
+
+			return fmt.Errorf("Summary:\nargument %d \nwant: \n	type  '%T' \n	value '%+v' \ngot: \n	type  '%T' \n	value '%+v'",
+				k,
+				darg,
+				darg,
+				v.Value,
+				v.Value)
 		}
 	}
 	return nil
 }
 
+func errorFormat(argIndex int, expectedType interface{}, expectedValue interface{}, actualType interface{}, actualValue interface{}) error {
+    return fmt.Errorf("Argument %d \nExpected: \n\tType:  '%T' \n\tValue: '%+v' \nReceived: \n\tType:  '%T' \n\tValue: '%+v'",
+        argIndex,
+        expectedType,
+        expectedType,
+        actualType,
+        actualType)
+}
+
+
 func (e *queryBasedExpectation) attemptArgMatch(args []driver.NamedValue) (err error) {
 	// catch panic
 	defer func() {

sqlmock_before_go18.go

@@ -94,7 +94,7 @@ func (c *sqlmock) query(query string, args []namedValue) (*ExpectedQuery, error)
 	}
 
 	if err := expected.argsMatches(args); err != nil {
-		return nil, fmt.Errorf("Query '%s', arguments do not match: %s", query, err)
+		return nil, fmt.Errorf("Query " + ErrMsgFmt, query, err)
 	}
 
 	expected.triggered = true

sqlmock_go18.go

@@ -1,5 +1,4 @@
 // +build go1.8
-
 package sqlmock
 
 import (
@@ -242,7 +241,7 @@ func (c *sqlmock) query(query string, args []driver.NamedValue) (*ExpectedQuery,
 	}
 
 	if err := expected.argsMatches(args); err != nil {
-		return nil, fmt.Errorf("Query '%s', arguments do not match: %s", query, err)
+		return nil, fmt.Errorf("Query " + errMsgFmt, query, err)
 	}
 
 	expected.triggered = true
@@ -278,6 +277,10 @@ func (c *sqlmock) Exec(query string, args []driver.Value) (driver.Result, error)
 	return ex.result, nil
 }
 
+const (
+	errMsgFmt = "'%s', \n\narguments do not match: \n	%s"
+)
+
 func (c *sqlmock) exec(query string, args []driver.NamedValue) (*ExpectedExec, error) {
 	var expected *ExpectedExec
 	var fulfilled int
@@ -324,7 +327,7 @@ func (c *sqlmock) exec(query string, args []driver.NamedValue) (*ExpectedExec, e
 	}
 
 	if err := expected.argsMatches(args); err != nil {
-		return nil, fmt.Errorf("ExecQuery '%s', arguments do not match: %s", query, err)
+		return nil, fmt.Errorf("ExecQuery: " + errMsgFmt, query, err)
 	}
 
 	expected.triggered = true
@@ -333,7 +336,7 @@ func (c *sqlmock) exec(query string, args []driver.NamedValue) (*ExpectedExec, e
 	}
 
 	if expected.result == nil {
-		return nil, fmt.Errorf("ExecQuery '%s' with args %+v, must return a database/sql/driver.Result, but it was not set for expectation %T as %+v", query, args, expected, expected)
+		return nil, fmt.Errorf("\nExecQuery '%s' with args %+v, must return a database/sql/driver.Result, but it was not set for expectation %T as %+v", query, args, expected, expected)
 	}
 
 	return expected, nil