api/tests: add blueprint freeze test

This test creates a new blueprint with libsemanage. Libsemanage is
already in the mock rpmmd so when we test the freeze route on this
blueprint, the blueprint will properly depsolve and return the package
with the depsolved version.

internal/weldr/api_test.go

@@ -250,6 +250,24 @@ func TestBlueprintsInfo(t *testing.T) {
 	}
 }
 
+func TestBlueprintsFreeze(t *testing.T) {
+	var cases = []struct {
+		Fixture        rpmmd_mock.Fixture
+		Path           string
+		ExpectedStatus int
+		ExpectedJSON   string
+	}{
+		{rpmmd_mock.BaseFixture, "/api/v0/blueprints/freeze/test", http.StatusOK, `{"blueprints":[{"blueprint":{"name":"test","description":"Test","version":"0.0.0","packages":[{"name":"libsemanage","version":"2.9-1.fc30.x86_64"}],"modules":[],"groups":[]}}],"errors":[]}`},
+	}
+
+	for _, c := range cases {
+		api, _ := createWeldrAPI(c.Fixture)
+		sendHTTP(api, true, "POST", "/api/v0/blueprints/new", `{"name":"test","description":"Test","packages":[{"name":"libsemanage","version":"*"}],"version":"0.0.0"}`)
+		testRoute(t, api, true, "GET", c.Path, ``, c.ExpectedStatus, c.ExpectedJSON)
+		sendHTTP(api, true, "DELETE", "/api/v0/blueprints/delete/test", ``)
+	}
+}
+
 func TestBlueprintsDiff(t *testing.T) {
 	var cases = []struct {
 		Method         string