diff --git a/assert/assertions_test.go b/assert/assertions_test.go
index 4f91c21..dc59b91 100644
--- a/assert/assertions_test.go
+++ b/assert/assertions_test.go
@@ -195,6 +195,22 @@ func TestNotEqual(t *testing.T) {
 	if !NotEqual(mockT, nil, new(AssertionTesterConformingObject)) {
 		t.Error("NotEqual should return true")
 	}
+
+	if NotEqual(mockT, "Hello World", "Hello World") {
+		t.Error("NotEqual should return false")
+	}
+	if NotEqual(mockT, 123, 123) {
+		t.Error("NotEqual should return false")
+	}
+	if NotEqual(mockT, 123.5, 123.5) {
+		t.Error("NotEqual should return false")
+	}
+	if NotEqual(mockT, []byte("Hello World"), []byte("Hello World")) {
+		t.Error("NotEqual should return false")
+	}
+	if NotEqual(mockT, new(AssertionTesterConformingObject), new(AssertionTesterConformingObject)) {
+		t.Error("NotEqual should return false")
+	}
 }
 
 func TestContains(t *testing.T) {
@@ -223,6 +239,19 @@ func TestNotContains(t *testing.T) {
 
 }
 
+func TestCondition(t *testing.T) {
+	mockT := new(testing.T)
+
+	if !Condition(mockT, func() bool { return true }, "Truth") {
+		t.Error("Condition should return true")
+	}
+
+	if Condition(mockT, func() bool { return false }, "Lie") {
+		t.Error("Condition should return false")
+	}
+
+}
+
 func TestDidPanic(t *testing.T) {
 
 	if funcDidPanic, _ := didPanic(func() {
@@ -482,6 +511,29 @@ func TestLen(t *testing.T) {
 	for _, c := range cases {
 		True(t, Len(mockT, c.v, c.l), "%#v have %d items", c.v, c.l)
 	}
+
+	cases = []struct {
+		v interface{}
+		l int
+	}{
+		{[]int{1, 2, 3}, 4},
+		{[...]int{1, 2, 3}, 2},
+		{"ABC", 2},
+		{map[int]int{1: 2, 2: 4, 3: 6}, 4},
+		{ch, 2},
+
+		{[]int{}, 1},
+		{map[int]int{}, 1},
+		{make(chan int), 1},
+
+		{[]int(nil), 1},
+		{map[int]int(nil), 1},
+		{(chan int)(nil), 1},
+	}
+
+	for _, c := range cases {
+		False(t, Len(mockT, c.v, c.l), "%#v have %d items", c.v, c.l)
+	}
 }
 
 func TestWithinDuration(t *testing.T) {
@@ -536,3 +588,42 @@ func TestInDelta(t *testing.T) {
 		True(t, InDelta(mockT, tc.a, tc.b, tc.delta), "Expected |%V - %V| <= %v", tc.a, tc.b, tc.delta)
 	}
 }
+
+func TestInEpsilon(t *testing.T) {
+	mockT := new(testing.T)
+
+	cases := []struct {
+		a, b    interface{}
+		epsilon float64
+	}{
+		{uint8(2), uint16(2), .001},
+		{2.1, 2.2, 0.1},
+		{2.2, 2.1, 0.1},
+		{-2.1, -2.2, 0.1},
+		{-2.2, -2.1, 0.1},
+		{uint64(100), uint8(101), 0.01},
+		{0.1, -0.1, 2},
+	}
+
+	for _, tc := range cases {
+		True(t, InEpsilon(mockT, tc.a, tc.b, tc.epsilon, "Expected %V and %V to have a relative difference of %v", tc.a, tc.b, tc.epsilon))
+	}
+
+	cases = []struct {
+		a, b    interface{}
+		epsilon float64
+	}{
+		{uint8(2), int16(-2), .001},
+		{uint64(100), uint8(102), 0.01},
+		{2.1, 2.2, 0.001},
+		{2.2, 2.1, 0.001},
+		{2.1, -2.2, 1},
+		{2.1, "bla-bla", 0},
+		{0.1, -0.1, 1.99},
+	}
+
+	for _, tc := range cases {
+		False(t, InEpsilon(mockT, tc.a, tc.b, tc.epsilon, "Expected %V and %V to have a relative difference of %v", tc.a, tc.b, tc.epsilon))
+	}
+
+}
diff --git a/assert/forward_assertions.go b/assert/forward_assertions.go
index 7c2eea7..f950633 100644
--- a/assert/forward_assertions.go
+++ b/assert/forward_assertions.go
@@ -183,14 +183,14 @@ func (a *Assertions) WithinDuration(expected, actual time.Time, delta time.Durat
 // 	 assert.InDelta(t, math.Pi, (22 / 7.0), 0.01)
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) InDelta(t TestingT, expected, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
+func (a *Assertions) InDelta(expected, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
 	return InDelta(a.t, expected, actual, delta, msgAndArgs...)
 }
 
 // InEpsilon asserts that expected and actual have a relative error less than epsilon
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) InEpsilon(t TestingT, expected, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
+func (a *Assertions) InEpsilon(expected, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
 	return InEpsilon(a.t, expected, actual, epsilon, msgAndArgs...)
 }
 
diff --git a/assert/forward_assertions_test.go b/assert/forward_assertions_test.go
index 7982b07..1b29ef8 100644
--- a/assert/forward_assertions_test.go
+++ b/assert/forward_assertions_test.go
@@ -171,6 +171,20 @@ func TestNotContainsWrapper(t *testing.T) {
 
 }
 
+func TestConditionWrapper(t *testing.T) {
+
+	assert := New(new(testing.T))
+
+	if !assert.Condition(func() bool { return true }, "Truth") {
+		t.Error("Condition should return true")
+	}
+
+	if assert.Condition(func() bool { return false }, "Lie") {
+		t.Error("Condition should return false")
+	}
+
+}
+
 func TestDidPanicWrapper(t *testing.T) {
 
 	if funcDidPanic, _ := didPanic(func() {
@@ -378,3 +392,75 @@ func TestWithinDurationWrapper(t *testing.T) {
 	assert.False(mockAssert.WithinDuration(a, b, -11*time.Second), "A 10s difference is not within a 9s time difference")
 	assert.False(mockAssert.WithinDuration(b, a, -11*time.Second), "A 10s difference is not within a 9s time difference")
 }
+
+func TestInDeltaWrapper(t *testing.T) {
+	assert := New(new(testing.T))
+
+	True(t, assert.InDelta(1.001, 1, 0.01), "|1.001 - 1| <= 0.01")
+	True(t, assert.InDelta(1, 1.001, 0.01), "|1 - 1.001| <= 0.01")
+	True(t, assert.InDelta(1, 2, 1), "|1 - 2| <= 1")
+	False(t, assert.InDelta(1, 2, 0.5), "Expected |1 - 2| <= 0.5 to fail")
+	False(t, assert.InDelta(2, 1, 0.5), "Expected |2 - 1| <= 0.5 to fail")
+	False(t, assert.InDelta("", nil, 1), "Expected non numerals to fail")
+
+	cases := []struct {
+		a, b  interface{}
+		delta float64
+	}{
+		{uint8(2), uint8(1), 1},
+		{uint16(2), uint16(1), 1},
+		{uint32(2), uint32(1), 1},
+		{uint64(2), uint64(1), 1},
+
+		{int(2), int(1), 1},
+		{int8(2), int8(1), 1},
+		{int16(2), int16(1), 1},
+		{int32(2), int32(1), 1},
+		{int64(2), int64(1), 1},
+
+		{float32(2), float32(1), 1},
+		{float64(2), float64(1), 1},
+	}
+
+	for _, tc := range cases {
+		True(t, assert.InDelta(tc.a, tc.b, tc.delta), "Expected |%V - %V| <= %v", tc.a, tc.b, tc.delta)
+	}
+}
+
+func TestInEpsilonWrapper(t *testing.T) {
+	assert := New(new(testing.T))
+
+	cases := []struct {
+		a, b    interface{}
+		epsilon float64
+	}{
+		{uint8(2), uint16(2), .001},
+		{2.1, 2.2, 0.1},
+		{2.2, 2.1, 0.1},
+		{-2.1, -2.2, 0.1},
+		{-2.2, -2.1, 0.1},
+		{uint64(100), uint8(101), 0.01},
+		{0.1, -0.1, 2},
+	}
+
+	for _, tc := range cases {
+		True(t, assert.InEpsilon(tc.a, tc.b, tc.epsilon, "Expected %V and %V to have a relative difference of %v", tc.a, tc.b, tc.epsilon))
+	}
+
+	cases = []struct {
+		a, b    interface{}
+		epsilon float64
+	}{
+		{uint8(2), int16(-2), .001},
+		{uint64(100), uint8(102), 0.01},
+		{2.1, 2.2, 0.001},
+		{2.2, 2.1, 0.001},
+		{2.1, -2.2, 1},
+		{2.1, "bla-bla", 0},
+		{0.1, -0.1, 1.99},
+	}
+
+	for _, tc := range cases {
+		False(t, assert.InEpsilon(tc.a, tc.b, tc.epsilon, "Expected %V and %V to have a relative difference of %v", tc.a, tc.b, tc.epsilon))
+	}
+}