test: add a test-case to prevent bad multilib depsolves

When gsl with version * was specified in the blueprint,
composer depsolved both x86_64 and i686 version of gsl.
This test case should prevent this from happening.
gsl is used because it has x86_64 and i686 versions on both RHEL and Fedora.
Also, gsl-devel package exists, which is not dependant on gsl and shouldn't
be depsolved.

internal/client/blueprints_test.go

@@ -11,10 +11,13 @@
 package client
 
 import (
+	"encoding/json"
 	"sort"
+	"strings"
 	"testing"
 
 	"github.com/BurntSushi/toml"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -916,6 +919,51 @@ func TestBlueprintDepsolveV0(t *testing.T) {
 
 }
 
+// When gsl with version * was specified in the blueprint,
+// composer depsolved both x86_64 and i686 version of gsl.
+// This test case should prevent this from happening.
+// gsl is used because it has x86_64 and i686 versions on both RHEL and Fedora.
+// Also, gsl-devel package exists, which is not dependant on gsl and shouldn't
+// be depsolved.
+func TestMultilibBlueprintDepsolveV0(t *testing.T) {
+	if testState.unitTest {
+		t.Skip()
+	}
+	versionStrings := []string{"*", "2.*", ""}
+	for _, versionString := range versionStrings {
+		t.Run(versionString, func(t *testing.T) {
+			bp := `{
+				"name": "test-multilib-deps-blueprint-v0",
+				"description": "CheckBlueprintDepsolveV0",
+				"version": "0.0.1",
+				"packages": [{"name": "gsl", "version": "` + versionString + `"}]
+			}`
+
+			resp, err := PostJSONBlueprintV0(testState.socket, bp)
+			require.NoError(t, err, "POST blueprint failed with a client error")
+			require.True(t, resp.Status, "POST blueprint failed: %#v", resp)
+
+			deps, api, err := DepsolveBlueprintV0(testState.socket, "test-multilib-deps-blueprint-v0")
+			require.NoError(t, err, "Depsolve blueprint failed with a client error")
+			require.Nil(t, api, "DepsolveBlueprint failed: %#v", api)
+
+			gslCount := 0
+			for _, dep := range deps.Blueprints[0].Dependencies {
+				if strings.HasPrefix(dep.Name, "gsl") {
+					gslCount += 1
+				}
+			}
+
+			if !assert.Equalf(t, 1, gslCount, "gsl is specified %d-times in the depsolve, should be there only once", gslCount) {
+				depsolveOutput, err := json.MarshalIndent(deps, "", "  ")
+				require.NoError(t, err)
+				t.Logf("depsolve output:\n%s", depsolveOutput)
+				t.FailNow()
+			}
+		})
+	}
+}
+
 // depsolve a non-existent blueprint
 func TestNonBlueprintDepsolveV0(t *testing.T) {
 	resp, api, err := DepsolveBlueprintV0(testState.socket, "test-deps-non-blueprint-v0")