diff --git a/src/strconv/atoc_test.go b/src/strconv/atoc_test.go
index 14d044da01dc37..69ad04b3d59216 100644
--- a/src/strconv/atoc_test.go
+++ b/src/strconv/atoc_test.go
@@ -4,7 +4,10 @@
 
 package strconv_test
 
-import ()
+import (
+	. "strconv"
+	"testing"
+)
 
 // Test cases required:
 // hex form
@@ -15,3 +18,110 @@ import ()
 // With and without parentheses
 // NaN
 // ±Inf
+
+type tcase struct {
+	str       string
+	expAnswer complex128
+	expErr    error
+}
+
+func TestParseComplex(t *testing.T) {
+
+	tests := []tcase{
+		{
+			str:       "99",
+			expAnswer: complex(99, 0),
+		},
+		{
+			str:       "+99",
+			expAnswer: complex(99, 0),
+		},
+		{
+			str:       "-99",
+			expAnswer: complex(-99, 0),
+		},
+		{
+			str:       "+1i",
+			expAnswer: complex(0, 1),
+		},
+		{
+			str:       "-1i",
+			expAnswer: complex(0, -1),
+		},
+		{
+			str:       "+3-i",
+			expAnswer: complex(3, -1),
+		},
+		{
+			str:       "+3+i",
+			expAnswer: complex(3, 1),
+		},
+		{
+			str:       "3-i",
+			expAnswer: complex(3, -1),
+		},
+		{
+			str:       "3+i",
+			expAnswer: complex(3, 1),
+		},
+		{
+			str:       "+i",
+			expAnswer: complex(0, 1),
+		},
+		{
+			str:       "-i",
+			expAnswer: complex(0, -1),
+		},
+		{
+			str:       "3e3-i",
+			expAnswer: complex(3e3, -1),
+		},
+		{
+			str:       "-3e3-i",
+			expAnswer: complex(-3e3, -1),
+		},
+		{
+			str:       "+3e3-i",
+			expAnswer: complex(3e3, -1),
+		},
+		{
+			str:       "3e+3-i",
+			expAnswer: complex(3e+3, -1),
+		},
+		{
+			str:       "-3e+3-i",
+			expAnswer: complex(-3e+3, -1),
+		},
+		{
+			str:       "-3e+3-i",
+			expAnswer: complex(-3e+3, -1),
+		},
+		{
+			str:       "+3e+3-3e+3i",
+			expAnswer: complex(3e+3, -3e+3),
+		},
+		{
+			str:       "+3e+3+3e+3i",
+			expAnswer: complex(3e+3, 3e+3),
+		},
+	}
+
+	for i, tc := range tests {
+
+		got, gotErr := ParseComplex(tc.str, 128)
+		if gotErr != nil {
+			if tc.expErr == nil {
+				t.Errorf("%d: |got: %v |expected: %v", i, gotErr, tc.expErr)
+			}
+		} else {
+			if tc.expErr != nil {
+				t.Errorf("%d: |got: %v |expected: %v", i, got, tc.expErr)
+			} else {
+				if got != tc.expAnswer {
+					t.Errorf("%d: |got: %v |expected: %v", i, got, tc.expAnswer)
+				}
+			}
+		}
+	}
+
+}