diff --git a/src/chapter1/problem1_test.go b/src/chapter1/problem1_test.go
index e4f35d3..e7f17e4 100644
--- a/src/chapter1/problem1_test.go
+++ b/src/chapter1/problem1_test.go
@@ -17,7 +17,7 @@ func TestIsUnique(t *testing.T) {
 	for _, c := range cases {
 		actual := IsUnique(c.input)
 		if actual != c.expected {
-			t.Fatalf("Input %s. Expected: %b, actual: %b\n", c.input, c.expected, actual)
+			t.Fatalf("Input %s. Expected: %t, actual: %t\n", c.input, c.expected, actual)
 		}
 	}
 }
diff --git a/src/chapter1/problem2_test.go b/src/chapter1/problem2_test.go
index b602156..8fe328c 100644
--- a/src/chapter1/problem2_test.go
+++ b/src/chapter1/problem2_test.go
@@ -20,7 +20,7 @@ func TestArePermutations(t *testing.T) {
 	for _, c := range cases {
 		actual := ArePermutations(c.input1, c.input2)
 		if actual != c.expected {
-			t.Fatalf("Inputs %s, %s. Expected: %b, actual: %b\n",
+			t.Fatalf("Inputs %s, %s. Expected: %t, actual: %t\n",
 				c.input1, c.input2, c.expected, actual)
 		}
 	}
diff --git a/src/chapter1/problem4_test.go b/src/chapter1/problem4_test.go
index 5aabb17..c26db8a 100644
--- a/src/chapter1/problem4_test.go
+++ b/src/chapter1/problem4_test.go
@@ -18,7 +18,7 @@ func TestIsPalindromePerm(t *testing.T) {
 	for _, c := range cases {
 		actual := IsPalindromePerm(c.input)
 		if actual != c.expected {
-			t.Fatalf("Input %s. Expected: %b, actual: %b\n", c.input, c.expected, actual)
+			t.Fatalf("Input %s. Expected: %t, actual: %t\n", c.input, c.expected, actual)
 		}
 	}
 }
diff --git a/src/chapter1/problem5_test.go b/src/chapter1/problem5_test.go
index f18291b..dccf82f 100644
--- a/src/chapter1/problem5_test.go
+++ b/src/chapter1/problem5_test.go
@@ -24,7 +24,7 @@ func TestAreOneEditAway(t *testing.T) {
 	for _, c := range cases {
 		actual := AreOneEditAway(c.input1, c.input2)
 		if actual != c.expected {
-			t.Fatalf("Inputs %s, %s. Expected: %b, actual: %b\n",
+			t.Fatalf("Inputs %s, %s. Expected: %t, actual: %t\n",
 				c.input1, c.input2, c.expected, actual)
 		}
 	}
diff --git a/src/chapter1/problem9_test.go b/src/chapter1/problem9_test.go
index 14157b0..d56445d 100644
--- a/src/chapter1/problem9_test.go
+++ b/src/chapter1/problem9_test.go
@@ -20,7 +20,7 @@ func TestIsRotation(t *testing.T) {
 	for _, c := range cases {
 		actual := IsRotation(c.input1, c.input2)
 		if actual != c.expected {
-			t.Fatalf("Inputs %s, %s. Expected: %b, actual: %b\n",
+			t.Fatalf("Inputs %s, %s. Expected: %t, actual: %t\n",
 				c.input1, c.input2, c.expected, actual)
 		}
 	}
diff --git a/src/chapter3/problem6_test.go b/src/chapter3/problem6_test.go
index c34ef20..5bc00b6 100644
--- a/src/chapter3/problem6_test.go
+++ b/src/chapter3/problem6_test.go
@@ -16,20 +16,20 @@ func TestPetShelter(t *testing.T) {
 		t.Fatalf("Unexpected error: %v\n", err)
 	}
 	if i.petType != DogType || i.name != "lucky" {
-		t.Fatalf("Expected: lucky, actual: %d\n", i.name)
+		t.Fatalf("Expected: lucky, actual: %s\n", i.name)
 	}
 	i, err = ps.dequeueDog()
 	if err != nil {
 		t.Fatalf("Unexpected error: %v\n", err)
 	}
 	if i.petType != DogType || i.name != "spot" {
-		t.Fatalf("Expected: spot, actual: %d\n", i.name)
+		t.Fatalf("Expected: spot, actual: %s\n", i.name)
 	}
 	i, err = ps.dequeueCat()
 	if err != nil {
 		t.Fatalf("Unexpected error: %v\n", err)
 	}
 	if i.petType != CatType || i.name != "snowball" {
-		t.Fatalf("Expected: snowball, actual: %d\n", i.name)
+		t.Fatalf("Expected: snowball, actual: %s\n", i.name)
 	}
 }