Preserve previous test behavior before implied caret

Author: carolynvs

cmd/dep/testdata/harness_tests/ensure/override/case1/testcase.json

@@ -1,7 +1,7 @@
 {
   "commands": [
     ["init"],
-    ["ensure", "-override", "github.com/sdboyer/[email protected]"]
+    ["ensure", "-override", "github.com/sdboyer/deptest@=1.0.0"]
   ],
   "error-expected": "",
   "vendor-final": [

internal/gps/rootdata_test.go

@@ -91,11 +91,11 @@ func TestGetApplicableConstraints(t *testing.T) {
 			result: []workingConstraint{
 				{
 					Ident:      mkPI("a"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("b"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 			},
 		},
@@ -108,11 +108,11 @@ func TestGetApplicableConstraints(t *testing.T) {
 			result: []workingConstraint{
 				{
 					Ident:      mkPI("a"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("b"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 			},
 		},
@@ -127,11 +127,11 @@ func TestGetApplicableConstraints(t *testing.T) {
 			result: []workingConstraint{
 				{
 					Ident:      mkPI("a"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("b"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 			},
 		},
@@ -145,11 +145,11 @@ func TestGetApplicableConstraints(t *testing.T) {
 			result: []workingConstraint{
 				{
 					Ident:      mkPI("a"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("b"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("c"),
@@ -167,11 +167,11 @@ func TestGetApplicableConstraints(t *testing.T) {
 			result: []workingConstraint{
 				{
 					Ident:      mkPI("a"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("b"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("c"),
@@ -195,11 +195,11 @@ func TestGetApplicableConstraints(t *testing.T) {
 			result: []workingConstraint{
 				{
 					Ident:      mkPI("a"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("b"),
-					Constraint: mkSVC("1.0.0"),
+					Constraint: mkSVC("=1.0.0"),
 				},
 				{
 					Ident:      mkPI("c"),