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diff --git a/spec/inputs/test/string_interpolation_spec.yue b/spec/inputs/test/string_interpolation_spec.yue
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+describe "string interpolation", ->
+        it "should interpolate in double quotes", ->
+                name = "World"
+                result = "Hello #{name}!"
+                assert.same result, "Hello World!"
+
+        it "should interpolate numbers", ->
+                a, b = 10, 20
+                result = "#{a} + #{b} = #{a + b}"
+                assert.same result, "10 + 20 = 30"
+
+        it "should interpolate expressions", ->
+                x = 5
+                result = "x * 2 = #{x * 2}"
+                assert.same result, "x * 2 = 10"
+
+        it "should interpolate function calls", ->
+                result = "result: #{math.floor 5.5}"
+                assert.same result, "result: 5"
+
+        it "should interpolate in string literals", ->
+                x = 100
+                result = "Value: #{x}"
+                assert.same result, "Value: 100"
+
+        it "should work with nested interpolation", ->
+                inner = "inner"
+                result = "Outer: #{inner}"
+                assert.same result, "Outer: inner"
+
+        it "should not interpolate in single quotes", ->
+                name = "World"
+                result = 'Hello #{name}!'
+                assert.same result, 'Hello #{name}!'