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Improve verify/0 and verify/1 test coverage #142

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Aug 10, 2023
Merged

Improve verify/0 and verify/1 test coverage #142

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50626a3
Better verify/0 vs verify/1 tests
metavida Aug 4, 2023
1ee925f
Dramatically reduce complexity of verify!/0 test assertions
metavida Aug 10, 2023
999810c
Increase coverage of verify!/1 tests by capturing assert_raise error
metavida Aug 10, 2023
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108 changes: 77 additions & 31 deletions test/mox_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -351,39 +351,54 @@ defmodule MoxTest do

verify!()
expect(CalcMock, :add, fn x, y -> x + y end)
expect(SciCalcOnlyMock, :exponent, fn x, y -> x * y end)
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Annotation: I realize that this implementation is actually multiplication (not an exponent) but these tests are focused on the verify method not the expect method, so I decided not to worry about this detail.


message = ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
assert_raise Mox.VerificationError, message, &verify!/0
error = assert_raise(Mox.VerificationError, &verify!/0)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
assert error.message =~ ~r"expected SciCalcOnlyMock.exponent/2 to be invoked once but it was invoked 0 times"

assert CalcMock.add(2, 3) == 5
CalcMock.add(2, 3)
Comment on lines -358 to +360
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Annotation: I remove assertions of the CalcMock.add method because, again, these tests should be focusing on assertions related to the verify method not the return behavior introduced by the expect method call.

error = assert_raise(Mox.VerificationError, &verify!/0)
refute error.message =~ ~r"expected CalcMock.add/2"
assert error.message =~ ~r"expected SciCalcOnlyMock.exponent/2 to be invoked once but it was invoked 0 times"

SciCalcOnlyMock.exponent(2, 3)
verify!()
expect(CalcMock, :add, fn x, y -> x + y end)

message = ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
assert_raise Mox.VerificationError, message, &verify!/0
# Adding another expected call makes verification fail again
expect(CalcMock, :add, fn x, y -> x + y end)
error = assert_raise(Mox.VerificationError, &verify!/0)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
refute error.message =~ ~r"expected SciCalcOnlyMock.exponent/2"
end

test "verifies all mocks for the current process in global mode" do
set_mox_global()

verify!()
expect(CalcMock, :add, fn x, y -> x + y end)
expect(SciCalcOnlyMock, :exponent, fn x, y -> x * y end)

message = ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
assert_raise Mox.VerificationError, message, &verify!/0
error = assert_raise(Mox.VerificationError, &verify!/0)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
assert error.message =~ ~r"expected SciCalcOnlyMock.exponent/2 to be invoked once but it was invoked 0 times"

task =
Task.async(fn ->
assert CalcMock.add(2, 3) == 5
end)
Task.async(fn -> SciCalcOnlyMock.exponent(2, 4) end)
|> Task.await()

Task.await(task)
error = assert_raise(Mox.VerificationError, &verify!/0)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
refute error.message =~ ~r"expected SciCalcOnlyMock.exponent/2"

Task.async(fn -> CalcMock.add(5, 6) end)
|> Task.await()

verify!()
expect(CalcMock, :add, fn x, y -> x + y end)

message = ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
assert_raise Mox.VerificationError, message, &verify!/0
expect(CalcMock, :add, fn x, y -> x + y end)
error = assert_raise(Mox.VerificationError, &verify!/0)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
refute error.message =~ ~r"expected SciCalcOnlyMock.exponent/2"
end
end

Expand All @@ -392,40 +407,71 @@ defmodule MoxTest do
set_mox_private()

verify!(CalcMock)
verify!(SciCalcOnlyMock)
expect(CalcMock, :add, fn x, y -> x + y end)
expect(SciCalcOnlyMock, :exponent, fn x, y -> x * y end)

message = ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
assert_raise Mox.VerificationError, message, &verify!/0
error = assert_raise(Mox.VerificationError, fn -> verify!(CalcMock) end)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
refute error.message =~ ~r"expected SciCalcOnlyMock.exponent/2"
Comment on lines -397 to +416
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Annotation: Even though the previous tests are in the describe "verify!/1" section, they used to be calling the verify!/0 method! With this change now we're actually 1️⃣ calling the verify!/1 method and 2️⃣ asserting that the behavior changes appropriately when there are multiple mocks used within the same test case.


assert CalcMock.add(2, 3) == 5
error = assert_raise(Mox.VerificationError, fn -> verify!(SciCalcOnlyMock) end)
assert error.message =~ ~r"expected SciCalcOnlyMock.exponent/2 to be invoked once but it was invoked 0 times"
refute error.message =~ ~r"expected CalcMock.add/2"

CalcMock.add(2, 3)
verify!(CalcMock)
expect(CalcMock, :add, fn x, y -> x + y end)

message = ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
assert_raise Mox.VerificationError, message, &verify!/0
error = assert_raise(Mox.VerificationError, fn -> verify!(SciCalcOnlyMock) end)
assert error.message =~ ~r"expected SciCalcOnlyMock.exponent/2 to be invoked once but it was invoked 0 times"
refute error.message =~ ~r"expected CalcMock.add/2"

SciCalcOnlyMock.exponent(2, 3)
verify!(CalcMock)
verify!(SciCalcOnlyMock)

expect(CalcMock, :add, fn x, y -> x + y end)
error = assert_raise Mox.VerificationError, fn -> verify!(CalcMock) end
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
refute error.message =~ ~r"expected SciCalcOnlyMock.exponent/2"
verify!(SciCalcOnlyMock)
end

test "verifies all mocks for current process in global mode" do
set_mox_global()

verify!(CalcMock)
verify!(SciCalcOnlyMock)
expect(CalcMock, :add, fn x, y -> x + y end)
expect(SciCalcOnlyMock, :exponent, fn x, y -> x * y end)

message = ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
assert_raise Mox.VerificationError, message, &verify!/0
error = assert_raise(Mox.VerificationError, fn -> verify!(CalcMock) end)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked once but it was invoked 0 times"
refute error.message =~ ~r"expected SciCalcOnlyMock.exponent/2"

task =
Task.async(fn ->
assert CalcMock.add(2, 3) == 5
end)
error = assert_raise(Mox.VerificationError, fn -> verify!(SciCalcOnlyMock) end)
assert error.message =~ ~r"expected SciCalcOnlyMock.exponent/2 to be invoked once but it was invoked 0 times"
refute error.message =~ ~r"expected CalcMock.add/2"

Task.await(task)
Task.async(fn -> CalcMock.add(2, 3) end)
|> Task.await()
verify!(CalcMock)

error = assert_raise(Mox.VerificationError, fn -> verify!(SciCalcOnlyMock) end)
assert error.message =~ ~r"expected SciCalcOnlyMock.exponent/2 to be invoked once but it was invoked 0 times"
refute error.message =~ ~r"expected CalcMock.add/2"

SciCalcOnlyMock.exponent(2, 3)
verify!(CalcMock)
verify!(SciCalcOnlyMock)

expect(CalcMock, :add, fn x, y -> x + y end)

error = assert_raise(Mox.VerificationError, &verify!/0)
assert error.message =~ ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
refute error.message =~ ~r"expected SciCalcOnlyMock.exponent/2"

message = ~r"expected CalcMock.add/2 to be invoked 2 times but it was invoked once"
assert_raise Mox.VerificationError, message, &verify!/0
verify!(SciCalcOnlyMock)
end

test "raises if a non-mock is given" do
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1 change: 1 addition & 0 deletions test/support/mocks.ex
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
Mox.defmock(CalcMock, for: Calculator)
Mox.defmock(SciCalcOnlyMock, for: ScientificCalculator)
Mox.defmock(SciCalcMock, for: [Calculator, ScientificCalculator])

Mox.defmock(SciCalcMockWithoutOptional,
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