diff --git a/src/pkg.jl b/src/pkg.jl
index f869d16..99ef7a5 100644
--- a/src/pkg.jl
+++ b/src/pkg.jl
@@ -32,7 +32,10 @@ function test(spec::_PackageSpec; kwargs...)
     end
 
     @info "Testing $spec..."
-    return test(testpath; kwargs...)
+    # `cd` so that `project="test/environments/main"` works
+    cd(dirname(testpath)) do
+        return test(testpath; kwargs...)
+    end
 end
 
 function copymanifest(oldpath::AbstractString, newpath::AbstractString)
diff --git a/test/runtests.jl b/test/runtests.jl
index 8f62315..30ad7b9 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -67,11 +67,10 @@ end
 
     pkgspec = PackageSpec(
         name = "InitialValues",
-        url = "https://github.com/tkf/InitialValues.jl",
-        rev = "62b240fb85836b9731b0a893e446a9c90311afce",
+        rev = "65ebf60fd37f975802c16511a04808f658a960ff",  # v0.2.9
     )
-    @test Run.test(pkgspec) isa Any
-    @test Run.test(pkgspec; inline=false) isa Any
+    @test Run.test(pkgspec; project="test/environments/main") isa Any
+    @test Run.test(pkgspec; project="test/environments/main", inline=false) isa Any
 
     pkgid = Base.PkgId(
         Base.UUID("22cec73e-a1b8-11e9-2c92-598750a2cf9c"),