diff --git a/test/components/argon.comp b/test/components/argon.comp
new file mode 100644
index 0000000..f6e1f13
--- /dev/null
+++ b/test/components/argon.comp
@@ -0,0 +1,5 @@
+Argon
+1
+Ar
+1
+39.948
\ No newline at end of file
diff --git a/test/components/nitrogen.comp b/test/components/nitrogen.comp
new file mode 100644
index 0000000..36596ee
--- /dev/null
+++ b/test/components/nitrogen.comp
@@ -0,0 +1,5 @@
+Nitrogen
+1
+N
+2
+28.0134
\ No newline at end of file
diff --git a/test/runtests.jl b/test/runtests.jl
index e5caed8..acb3752 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -24,6 +24,18 @@ using Test
     dummy = writecomponent(joinpath(@__DIR__, "components", "Hydrogen.comp"), fs.comps["Hydrogen"])
     @test dummy == 21
 
+    @comp begin
+        "N" --> 2
+    end "Nitrogen" fs
+    dummy = writecomponent(joinpath(@__DIR__, "components", "Nitrogen.comp"), fs.comps["Nitrogen"])
+    @test dummy == 22
+
+    @comp begin
+        "Ar" --> 1
+    end "Argon" fs
+    dummy = writecomponent(joinpath(@__DIR__, "components", "Argon.comp"), fs.comps["Argon"])
+    @test dummy == 19
+
     count = readcomponentlist!(fs, joinpath(@__DIR__, "components"), ["Ethylene", "Ethane", "Hydrogen"])
     @test count == 3
     @test fs.comps["Ethylene"].Mr ≈ 28.053