make tests slightly easier to write

email_test.go

@@ -13,15 +13,15 @@ func TestEmail(t *testing.T) {
 		{Input: "testexample.com", Err: true},
 	}
 
-	for _, testCase := range testCases {
-		err := Email(testCase.Input)
-		if testCase.Err {
+	for _, tc := range testCases {
+		err := Email(tc.Input)
+		if tc.Err {
 			if err == nil {
-				t.Errorf("Expected %q to be an invalid email; got nil", testCase.Input)
+				t.Errorf("Expected %q to be an invalid email; got nil", tc.Input)
 			}
 		} else {
 			if err != nil {
-				t.Errorf("Expected %q to be a valid email; got %s", testCase.Input, err)
+				t.Errorf("Expected %q to be a valid email; got %s", tc.Input, err)
 			}
 		}
 	}

length_test.go

@@ -16,12 +16,12 @@ func TestMaxLength(t *testing.T) {
 		{L: 8, Input: "abcdefghi", Err: true},
 	}
 
-	for _, testCase := range testCases {
-		t.Logf("Max length %d for %q", testCase.L, testCase.Input)
+	for _, tc := range testCases {
+		t.Logf("Max length %d for %q", tc.L, tc.Input)
 
-		f := MaxLength(testCase.L)
-		err := f(testCase.Input)
-		if testCase.Err {
+		f := MaxLength(tc.L)
+		err := f(tc.Input)
+		if tc.Err {
 			if err == nil {
 				t.Error("Expected an error; got nil")
 			}
@@ -47,12 +47,12 @@ func TestMinLength(t *testing.T) {
 		{L: 8, Input: "abcdefghi"},
 	}
 
-	for _, testCase := range testCases {
-		t.Logf("Min length %d for %q", testCase.L, testCase.Input)
+	for _, tc := range testCases {
+		t.Logf("Min length %d for %q", tc.L, tc.Input)
 
-		f := MinLength(testCase.L)
-		err := f(testCase.Input)
-		if testCase.Err {
+		f := MinLength(tc.L)
+		err := f(tc.Input)
+		if tc.Err {
 			if err == nil {
 				t.Error("Expected an error; got nil")
 			}

uuid_test.go

@@ -18,15 +18,15 @@ func TestUUID(t *testing.T) {
 		{Input: "01234567-89ab-cdef-ghij-klmnopqrstuv", Err: true},
 	}
 
-	for _, testCase := range testCases {
-		err := UUID(testCase.Input)
-		if testCase.Err {
+	for _, tc := range testCases {
+		err := UUID(tc.Input)
+		if tc.Err {
 			if err == nil {
-				t.Errorf("Expected %q to be an invalid UUID; got nil", testCase.Input)
+				t.Errorf("Expected %q to be an invalid UUID; got nil", tc.Input)
 			}
 		} else {
 			if err != nil {
-				t.Errorf("Expected %q to be a valid UUID; got %s", testCase.Input, err)
+				t.Errorf("Expected %q to be a valid UUID; got %s", tc.Input, err)
 			}
 		}
 	}